One Lozenge at Night. Fresh Mornings in as Little as One Week.
Without mints that fade in 20 minutes, rinses that burn, or brushing harder than you already do.
Wake up without the taste you check for. Virae works overnight, when the smell is made.
It was never your hygiene. Most bad breath starts on the back of the tongue, where brushing cannot reach.
85% had lower odour readings in one week. On placebo it was 30%.
Ten seconds after you brush. Then 60 nights to decide, or every penny back.
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Try Virae for 60 nights. If your mornings have not changed, email us and we refund every penny.
Bad breath is made on the back of your tongue by bacteria that turn protein into sulfur gas. Nothing you have used touches them for more than an hour.
Virae puts two clinically studied strains, BLIS K12 and M18, on that exact spot every night. They take the space, produce natural antibacterials called salivaricins, and the odour producers lose their home. Take it at night, because that is when your mouth is driest and they grow fastest. Wake up to a different mouth.
You will know the same way our customers knew: you stop doing the things you do now. The gum runs out slower. You stop checking before a meeting. You forget to step back. That happens for most people in week two or three, and by week four someone close to you usually says something.
And if it does not happen, you are covered. Try Virae for 60 nights. If your mornings have not changed, email us and we refund every penny.
Because most of them are the wrong product. K12 on its own is half the formula. M18 is the strain that clears the film on your tongue, and without it K12 has nowhere to settle. Check the label on the cheap one and you will usually find K12 alone, at a dose counted on the day it was made, not the day you use it.
Virae has both strains, at a count guaranteed to expiry, in a lozenge that stays on your tongue instead of a capsule that leaves in a second. And it comes with 60 nights to prove it. The Amazon one does not.
No. The strains settle on your tongue and stay, so this is not a mint you are stuck reapplying. Most people keep a jar by the bed because one lozenge a night is easier than going back to checking, but that is a habit, not a dependency.
Take it for 60 nights. If your mornings are different, decide then. If they are not, we refund you.
Keep the scraper. Scrape, brush, then the lozenge last, and it works better than either alone.
Bin the mouthwash. It kills every bacterium in your mouth, the smell producers grow back first, and it dries you out, which is the exact condition they need. Mouthwash is why you are still here. Virae replaces it.
Yes. Virae is a food, not a drug. BLIS K12 has been taken alongside everyday medication for over fifteen years with no known interactions.
If you are on tablets that dry your mouth, like blood pressure medication, Virae is built for you. Dry mouth is the reason those bacteria thrive, and a live strain that holds the tongue is the answer to it. The one exception is immune suppressant medication, where you should ask your GP first, as with any live culture.
Completely. Plain box, nothing on the outside. The jar looks like any other supplement on a bathroom shelf. Nobody has to know you ever had a problem, which is rather the point.
In the 2006 trial, 85% of people diagnosed with halitosis had lower odour readings after one week. Most customers notice their mornings change in week two or three. By week four, other people notice.
You get 60 nights to see it for yourself. Try Virae for 60 nights. If your mornings have not changed, email us and we refund every penny.
30 lozenges, so one jar is 30 nights. Each lozenge has BLIS K12 and BLIS M18, licensed from BLIS Technologies in New Zealand. Natural mint flavour. No alcohol, no sugar, vegan.
Try Virae for 60 nights. If your mornings have not changed, email us and we refund every penny. No return, no forms.
Orders leave our EU warehouse within 24 hours. UK delivery takes 2 to 4 working days. Delivery is free on every subscription and £3.95 on one-time orders.
HR
Hannah R.
"Two months in. I stopped thinking about my breath. That is the whole review."
More than 1,200 people stopped covering it up.
Mints, rinses and scrapers manage the smell. Virae changes what grows back.
The cause is not on your teeth. It is on the back of your tongue, and it is rebuilt every single night while you sleep.
Your mouth dries out while you sleep
Saliva is your mouth's own rinse. It almost stops at night, so for about eight hours nothing is washing anything away.
The coating grows back by morning
The back of your tongue is rough and shaded. Bacteria settle in, feed all night, and give off the gas you can taste when you wake up.
Mouthwash clears the good with the bad
Antiseptic does not pick and choose. It empties the whole surface, and the bacteria that cause the smell are the fastest to move back in.
Scraping clears it, but does not keep it clear
Scraping is the right instinct and it does work. But a cleared tongue is an empty tongue, and by morning the same bacteria have taken it back.
So what happens?
Everything you have tried either takes the coating off or covers the smell. By the next morning it has grown back. Nothing you have tried changes what grows there.
So why would this work when nothing else did?
It is not a stronger mouthwash. It does four things nothing else in your bathroom does.
It works at night, when the smell is made
Bad breath is built while you sleep. Your mouth goes dry, nothing rinses the bacteria away, and by morning the coating has grown back. A mint at 9am is treating something that finished at 6am. Virae is on your tongue while it is happening.
It stays on your tongue all night
You take it after brushing, then nothing else to eat or drink. A mouthwash is spat out in thirty seconds. The lozenge melts over three to five minutes, and the strains it leaves behind stay on the back of your tongue until morning.
It adds good bacteria instead of killing all of them
Mouthwash kills every bacterium in your mouth, and the ones that cause the smell grow back first. Virae does the opposite. It adds two good strains that take up the space, so the smelly ones have nowhere left to grow.
It builds. Every night does a bit more
One night helps a little. Thirty nights change what lives on your tongue. Most people notice the difference in week two or three. By week four, other people notice it too.
Real people, real mornings.
"The half step back stopped"
Fourteen years. Dentist twice a year, always fine. I used to watch for the little lean back when I talked to people at work and I have not seen it since about week four. I didn't tell anyone I was taking anything. Nobody has commented. That's the point, I think. There's nothing to comment on.
Dentist says fineChecking behaviour
Claire W.after 4 weeks
"Stopped breathing into my hand"
I used to do it before every meeting, in the lift, in the loo, everywhere. Somewhere in week three I realised I'd walked into a client meeting without doing it. I'd love to say it was a decision. It wasn't. It just fell away.
Checking behaviourAt work
Priya S.after 3 weeks
"Bought it for my husband"
Left it on his side of the sink with a note that said there's a money back thing. Didn't have to have the conversation. Six weeks later I kissed him good morning without doing the little breath hold. He has no idea that's when I noticed.
Bought for himNever discussed
Fiona M.after 6 weeks
"Smoker, and it still worked"
I'll be honest, I assumed this wasn't for someone like me. Twenty a day. Mornings are different now. Not perfect, I'm not going to pretend, but my partner stopped doing the thing with the window in the car.
SmokerPartner noticed
Steve P.after 5 weeks
"Gum packet still full"
Bought this as a punt. Week three I found the gum in my car and it was the same packet from when I started. Didn't notice I'd stopped reaching for it.
Constant gumTold no one
Dan R.after 3 weeks
"Works. Wish it was cheaper."
It does what it says. Mornings are fine now. Forty-odd quid every three months is a lot on top of everything else, but it's less than I was spending on rinses that did nothing, so.
CostFour stars
Rob C.after 5 weeks
"My wife noticed first"
I hadn't told her I was taking anything. About five weeks in she asked if I'd changed toothpaste. That was the whole review for me really.
Partner noticedTold no one
Tom H.after 5 weeks
"Dry mouth from my tablets"
I'm on two medications that dry my mouth right out and I'd been told that was just how it was going to be. The dryness is the same, I won't lie, but the smell that came with it has mostly gone. My son doesn't lean back any more.
Dry mouthTwo medications
Sunita R.after 7 weeks
"Tonsil stones"
I've had those horrible little stones for years and assumed that was the whole problem. Still get the odd one but the smell that used to go with them is basically gone. Wasn't expecting that.
Tonsil stonesUnexpected
Elaine F.after 6 weeks
"Nobody ever looked at the tongue"
Six years of clean check-ups. The page explained more in ten minutes than any appointment I've had. The white coating I'd been scraping off every morning got lighter around week two and now I mostly don't bother.
Tongue coatingClean check-ups
Jacelynn K.after 2 weeks
"My grandchildren sit closer"
My blood pressure tablets dry my mouth out. Nobody said anything but I knew. Six weeks in, my daughter hugged me goodbye and did not turn her head.
Dry mouthMedication
Margaret H.after 6 weeks
"Six years and £400"
A drawer full of half used rinses. This is the first thing that explained why they all failed, and then did what it said it would do.
Tried every rinseSix years
Aisha B.after 4 weeks
"Dating again"
Didn't want to write this but here we are. I'd been checking my breath before every date for years knowing it told me nothing. Two months in I've stopped. Went on a second date last week. Make of that what you will.
DatingChecking behaviour
Ben W.after 8 weeks
"Night shifts"
I work nights so 'take it at bedtime' means 9am for me. Still works. Take it after you brush, whatever time that is.
Night shiftsNot at bedtime
Gareth T.after 4 weeks
"Normal distance"
I talk to people at normal distance now without thinking about it. I didn't realise how much I'd been angling my face away until I stopped.
Standing backAt work
Marcus D.after 6 weeks
"Six months in, still holds"
Wanted to wait before writing this. Six months. Still one a night, still fine. The bit I care about is that it hasn't drifted back.
Six months inHeld steady
Peter J.after 6 months
"Took longer than a week for me"
The page says as little as a week and for me it was more like three. So don't panic if nothing happens at first, I nearly gave up at day ten. Now it's just part of brushing. Four stars because I'd have liked that said more clearly up front.
Slower startFour stars
Karen L.after 3 weeks
"I stopped licking my wrist"
If you know, you know. I don't do it any more.
Checking behaviourWrist test
Rachel B.after 9 weeks
What is actually in it
Two bacteria. One job each.
People who never get bad breath are not cleaner than you. Their mouths are already occupied by good bacteria. Virae puts the same two strains back.
BLIS K12™
3 billion CFU
Back of the tongue and throat
This is where the smell is made. Bacteria there break protein down into sulfur gas.
Settles on the rough back third of the tongue, the one place brushing never reaches
Produces salivaricin A2 and B, its own natural antibacterials
Crowds out the bacteria that make the gas
BLIS M18™
3 billion CFU
Teeth and gum line
The other half of the problem. Plaque along the gum line feeds the same kind of bacteria.
Settles along the gum line and between the teeth
Produces an enzyme that loosens plaque before it hardens
Three-month controlled trials: less bleeding, less plaque
Both are Streptococcus salivarius, a species almost everyone already carries. Most oral probiotics contain one or the other. Virae carries both.
Why a lozenge, and why at night
Live bacteria only work if they land in the right place and stay there.
Capsule✕Swallowed. Never touches your tongue.
Rinse✕Spat out in thirty seconds.
Lozenge✓Melts in 3 to 5 minutes. Stays where it lands.
Then you sleep. Eight dry hours, nothing to rinse them away. The same window your bad breath was being built in.
6 billionlive cultures per lozenge
3 to 5 minto dissolve, no chewing
0alcohol, sugar or antiseptic
Strains from New ZealandLicensed from BLISVegan & HalalNo alcohol, no sugar
Professor John Tagg, who discovered BLIS K12. Image courtesy of BLIS Technologies, New Zealand.
BLIS Technologies
Dunedin, New Zealand · founded 2000
Who they are
The biotechnology company that produces the K12 and M18 strains inside every Virae lozenge. Their whole business is finding the bacteria that keep a healthy mouth healthy, proving them in trials, and licensing them.
Where it started
The University of Otago, and one question: why do some people never get sore throats or bad breath, however they live?
How K12 was found
Researchers followed 100 schoolchildren for six years and tracked the bacteria in their mouths. A few children carried a strain that stopped the harmful bacteria growing. The strongest was named K12. M18, for the gums, came from the same work.
What BLIS means
Bacteriocin-Like Inhibitory Substances. The natural compounds these strains make. They suppress the bacteria behind the smell and leave the rest of the mouth alone.
The evidence
More than twenty published human trials on K12, including the 2006 halitosis trial cited on this page.
Virae's part
We license the strains, put them in a lozenge, and say on the jar exactly where they came from.
What you wanted, and what each one actually gave you
Everything you have tried does something. Only one of them does the thing you were buying it for.
ViraeMouthwashMints & gumGut probiotics
Adds good bacteria instead of killing them
Stays on the tongue after you swallow
Works overnight, when your mouth is driest
Still working at 3pm
Nothing to carry, nothing to reapply
Nothing to reach for in front of people
No burn, no dry mouth after
Helps in the next ten minutes
Slide
60nights money back
60-night result guarantee
Try Virae for 60 nights. If your mornings have not changed, email us and we refund every penny.
No return, no forms, no questions that make you explain yourself.
Trusted by customers in the UK and EU
Reviews of Virae
4.8Based on 1,206 reviews
5 1.0k
4 148
3 27
2 9
1 8
97%would recommend Virae to a friend
1,206 reviews
Questions
Everything you have tried either kills bacteria or covers the smell. Both wear off by lunch because neither changes what grows back. Virae is the first thing you will have used that adds the bacteria that stop the smell being made. That is not a better version of what you tried. It is the thing you were never offered.
Because you swallowed them. Gut probiotics pass your mouth in a second and go to work in your intestines, which is fine for your gut and useless for your breath. K12 and M18 are oral strains, and the lozenge dissolves on your tongue so they stay where the smell is made. Same idea, right postcode this time.
Because you have been doing everything right for your teeth and the smell is not on your teeth. It is on the back third of your tongue, in a film that grows back overnight from the same bacteria. Scraping removes the film. Virae changes what grows back. Keep scraping, add Virae, and the morning is different.
Your dentist is right. Your teeth are fine. A check-up examines teeth and gums and does not test breath or culture the tongue, so clean teeth and bad breath together is normal and nobody flagged it. Virae works on the part of your mouth the check-up never looks at.
Dentists treat teeth and gums, and they are very good at it. The tongue biome is microbiology, not dentistry, and K12 has been published on since 2006 without ever having a UK product built around breath. You had to find it yourself. Now you have.
Because your mouth is never empty. Something always lives on your tongue, and the only choice is what. Mouthwash clears the space and the smell producers move back in first, every time. Virae puts the good strains there instead and they hold the ground. That is why it lasts and rinse does not.
It has been sitting inside general oral health products at small doses, sold on gum health, to people who did not have your problem. Nobody put both strains, at a real dose, in front of the people who actually needed it, with a guarantee. We did.
Yes, and it is the clearest sign this is a tongue problem. Morning is what eight dry hours does to those bacteria. Coffee dries the mouth and gives them a second run. One source, one fix. Virae works overnight, which is exactly when your case is made.
Yes. That coating is the bacterial film where the smell is produced. Customers tell us it lightens from week two or three as M18 takes the surface. Keep scraping while it does.
It means Virae is more useful to you, not less. Dry mouth is why those bacteria thrive, and nothing you rinse with stays in a dry mouth. A live strain that settles on the tongue does. Several reviews on this page are from people on blood pressure or antidepressant medication.
Stomach breath is rare and comes with other symptoms you would know about. Tonsil stones are made by the same bacteria that live on your tongue, and K12 was first isolated from a healthy throat, so it lives there too. Customers with stones tell us the smell that came with them is gone. Try it for 60 nights and see.
The people in the 2006 trial were diagnosed with halitosis, not people with garlic breath, and 85% had large drops in odour readings within a week. Years of it does not make it harder to shift. It means nobody looked at the tongue. Virae does.
Yes. Virae works on the tongue, not the teeth, so your dental work makes no difference. Denture wearers often have a drier mouth, which makes the overnight problem worse and Virae more effective for you.
No. Bleeding gums or loose teeth need a dentist. But once the gums are treated and the smell is still there, which is common, that is the tongue, and that is what Virae fixes.
Because night is when the smell is made. Saliva washes bacteria away all day and nearly stops when you sleep, which is why morning breath exists. A lozenge taken last thing gets eight undisturbed hours on the tongue. Morning use is washed away by your first coffee.
Scrape, brush, then the lozenge. It goes in last and nothing follows it. That is the whole routine.
Let it dissolve, about five minutes. Chewing sends the strains straight down. The slower it goes, the better they settle.
Not straight after. Lozenge, then bed. If you wake thirsty in the night, water is fine.
Take it the next night. One missed night changes nothing. Keep the jar by the bed rather than in the bathroom cabinet and you will not miss many.
Night is where the results come from. If morning is the only time you remember, take it after breakfast rather than not at all, and move the jar to the bedside table as soon as you can.
Mild mint, like the last trace after brushing. It was made for bedtime, so it will not wake you up.
The gas itself. Volatile sulfur compounds, measured with a meter, in people diagnosed with halitosis. Not a questionnaire, not a self-report. 85% had lower readings after one week. The full reference is in the footer.
Then something reset it, and it is almost always a course of antibiotics or a return to antibacterial mouthwash. Stop the rinse, finish the antibiotics, start the lozenge again and it comes back. If it does not, email us. You are inside the guarantee.
Only if they also have M18, at a dose guaranteed to the end of shelf life, in a lozenge you dissolve rather than a capsule you swallow. Most do not. Products built on other strains, like L. reuteri, are a different product with different evidence. Virae is both BLIS strains, full dose, on the tongue, with 60 nights to prove it.
Yes. K12 and M18 are strains found in healthy mouths, used in children's products in New Zealand for years, with a long safety record. Suitable from age 12, and a teenager who has started checking their breath is exactly who it helps.
A few people notice a slightly different taste in the mouth for the first few days while the balance shifts. That is the sign it is working, and it passes.
Yes. Different strains, different place, no interference. Keep your gut one for your gut. Virae is for your breath.
Pause for the course, restart the day after your last dose. Antibiotics clear everything, including the strains you want. Virae is how you make sure the right ones come back first.
No sugar, no alcohol. The full ingredient list is on the label if you count carbohydrates.
Both. It says so on the jar.
K12 is a strain found naturally in healthy mouths with a long record of use in adults and children. We are not doctors, so check with your midwife or GP, and that is the information they will want.
One jar is fine and the guarantee covers it. Subscriptions cost less per night, ship free and pause or cancel in two clicks, which is why most people move across after the first jar. Either way you are covered for 60 nights.
You are charged when each jar ships, never before. Pause, skip or cancel from your account page, or email us and we do it for you.
Any time, from your account, in two clicks. No phone call and no retention offer.
No. Email us within 60 nights and we refund. Keep the jar.
Yes. UK and across the EU, from our EU warehouse.
No. Lid on, cool and dry. The bedside table is the right place, because that is where you will take it.
Virae Oral Probiotic
Targets the root-cause of bad breath
The problem
Where the smell is actually made
The rear third of the tongue is rough, shaded and rarely disturbed. Bacteria settle into it and form a film. They feed on proteins from food, saliva and shed cells, and the waste they give off is a group of gases called volatile sulfur compounds. Hydrogen sulfide smells of rotten eggs. Methyl mercaptan smells of decay.
This is why the problem is so hard to reach. The film sits behind the part of the tongue most people clean, in a place a toothbrush was never designed to touch, and it rebuilds itself continuously.
It also explains the pattern almost every sufferer describes: excellent dental hygiene and persistent breath at the same time. The two are not in conflict. They are happening in different parts of the mouth.
Oral origin of halitosis is estimated at 85 to 90% across the clinical literature. See also the Boston University dissertation on volatile sulfur compound production.
The problem
Why it is built at night
Through the day saliva washes bacteria off the tongue, dilutes their waste and carries oxygen, which sulfur producers dislike. Production falls sharply during sleep.
The result is roughly eight uninterrupted hours in which the film rebuilds with nothing to wash it away. Morning breath is not a separate condition. It is the same process, observed at its peak.
Two consequences follow. First, anything you take in the morning is fighting the finished product. Second, night is the only window in which something you place on the tongue can stay there long enough to establish itself.
Reduced nocturnal salivary flow and its role in morning halitosis are well described in oral physiology literature.
The problem
Why you cannot smell your own breath
Olfactory adaptation means continuous exposure to an odour stops registering it. Cupping your hand and breathing into it does not work, because the air still comes from you and your nose has already adjusted.
The clinical literature divides the field into three groups: genuine halitosis, where odour is measurable; pseudo-halitosis, where the person is convinced but instruments find nothing; and halitophobia, where the belief persists even after treatment.
This is why the only trustworthy evidence is other people's behaviour, and why we ask you to judge Virae over 60 nights rather than by how your mouth feels tonight.
Genuine halitosis, pseudo-halitosis and halitophobia are standard classifications in halitosis research.
The problem
Why your dentist keeps saying you are fine
Dentistry is built around decay and gum disease, both of which are visible, measurable and treatable with the tools in the room. A tongue biofilm is none of those things.
Sufferers routinely report being passed between dentists and ENT specialists with no finding at either end. One academic review of the field states plainly that doctors and dentists are generally unaware of the causes of this condition.
So the check-up result is usually accurate and unhelpful at the same time. Your teeth genuinely are fine. That was never where the smell was coming from.
Boston University dissertation on VSC production; halitosis is commonly managed outside routine dental examination.
The problem
Tonsil stones and the throat
Tonsil stones are small deposits of debris and bacteria that form in the crypts of the tonsils. Up to around one in ten people get them. One study of chronic tonsillitis patients with raised sulfur readings found tonsil stones present in about three quarters of them.
If this is your cause, the smell can be intense and intermittent, and scraping your tongue will do nothing at all.
K12 was first studied as a throat-protective strain, and a slowly dissolved lozenge coats the throat as well as the tongue, so it reaches this area. We will not promise it dissolves stones. If your case turns out to be structural, the 60-night guarantee is how you get your money back.
Tonsillolith prevalence and the association with elevated VSC readings are reported in ENT literature and summarised by WebMD.
Why the aisle fails
Mints and gum: 15 to 30 minutes
A mint adds a strong smell on top of an existing one and stimulates a brief rush of saliva. Both effects are real and both are temporary. Nothing about the bacteria on your tongue has changed.
Sugared versions add a second problem: they feed the bacteria you are trying to suppress.
The deeper cost is behavioural. Masking every few hours turns bad breath into a full-time management task, which is the thing most sufferers describe as exhausting long before they describe the smell itself.
Masking duration for breath mints and gums is widely reported at 15 to 30 minutes.
Why the aisle fails
Alcohol rinses can make it worse
Alcohol is a solvent and an astringent. It gives an immediate sensation of cleanliness and reduces saliva at the same time. Saliva is precisely what suppresses odour through the day.
The result is a cycle familiar to most long-term sufferers: sharp freshness, then a dry mouth an hour later, then breath that is worse than before the rinse.
This is also why so many people conclude they need to rinse more often. The product creates the conditions that make the next dose feel necessary.
Xerostomia is a recognised contributor to oral malodour; alcohol-containing rinses reduce salivary flow.
Why the aisle fails
What antiseptic rinsing does to your mouth
Antiseptics do not distinguish between bacteria. They reduce everything, including the species that keep odour producers in check.
When the population recovers, it does not recover evenly. Fast-growing, acid-tolerant organisms return first, which is why relief from a strong rinse is often followed by a return that feels worse than the starting point.
This is the strongest argument for the opposite approach. If sterilising the mouth worked, a century of rinses would have solved this. Occupying the space with the right bacteria is the strategy that has not been tried by most people reading this.
Bescos et al., Scientific Reports (Nature), 2020: chlorhexidine rinsing and shifts in the salivary microbiome.
Why the aisle fails
The nitrate-reducing bacteria you need
Certain oral bacteria reduce dietary nitrate to nitrite, which contributes to nitric oxide production in the body. Nitric oxide plays a role in the relaxation of blood vessels.
Research has examined what happens when antiseptic mouthwash disrupts this population, with studies reporting measurable effects on blood pressure in some groups.
We raise this not to alarm anyone, but to make a narrow point: the mouth's bacterial community is not dirt. Some of it is doing work for you. A product that removes all of it is a blunt instrument.
Bondonno et al., American Journal of Hypertension, 2015; and related work on the oral nitrate-reduction pathway. Verify current consensus before relying on this claim.
Why the aisle fails
Tongue scraping manages, it does not resolve
Mechanical removal genuinely works in the short term, and people who scrape are not wrong to do it. The film comes off and the readings fall.
The problem is that the surface is then bare, and the same community recolonises it, because nothing about the conditions has changed. Sufferers describe scraping twice a day and finding it back by morning.
Virae is not an argument against scraping. It is an argument about what has to happen afterwards. Removal is a reset. Occupancy is the fix.
Consistent with tongue-cleaning literature, which reports short-term VSC reduction without long-term resolution.
Why the aisle fails
Why gut probiotics did nothing
Most probiotics are selected for the intestine, contain species such as Lactobacillus and Bifidobacterium, and are formulated to survive stomach acid and open further down.
Bad breath of oral origin is made in your mouth. A product designed to bypass the mouth as quickly as possible cannot address it.
The distinction is the site, not the concept. Oral probiotics are strains that live on the tongue and throat, delivered in a form that leaves them there. That is why Virae is a slowly dissolving lozenge and not a capsule.
Site specificity of probiotic strains is a basic principle of probiotic science.
The strains
Streptococcus salivarius, the friendly resident
S. salivarius colonises the mouth within hours of birth and remains one of the dominant species on the tongue and throat for life. In most people it is entirely benign.
Some strains do more than occupy space. They produce compounds that inhibit competing bacteria, which is what gives their host a naturally low-odour mouth.
This matters for how you should think about the product. Virae is not introducing a foreign organism. It is topping up a resident species with two strains selected for what they produce.
Streptococcus salivarius is an early and dominant coloniser of the human oral cavity.
The strains
BLIS K12 and the Otago study
John Tagg spent ten years of his childhood on daily penicillin after rheumatic fever. The experience produced a career-long question: why do some children never get these infections at all?
As a microbiologist at Otago he tracked the oral bacteria of 100 schoolchildren over six years. One child with an unusually healthy throat carried a rare strain of S. salivarius that produced its own antibacterial compounds. He named it K12.
K12 is now among the most studied oral probiotic strains in the world, with more than twenty published human trials. Virae licenses it from BLIS Technologies, the New Zealand company built on that discovery.
University of Otago, Dunedin; BLIS Technologies company history. Strain: Streptococcus salivarius K12.
The strains
Salivaricins A2 and B
Salivaricins are lantibiotics: small proteins that some bacteria make to defend their territory against close competitors. They are narrow by design, because a bacterium gains nothing from destroying its whole neighbourhood.
This is the mechanical difference between Virae and an antiseptic. A rinse reduces everything and the fastest recolonisers return first. Salivaricins suppress a specific set of neighbours while the resident community stays intact.
The name BLIS comes from this: bacteriocin-like inhibitory substances, the class of compounds these strains produce.
Salivaricin A2 and B production by S. salivarius K12; bacteriocin research, University of Otago.
The strains
BLIS M18, the gum strain
M18 produces its own inhibitory compounds and has been studied against the bacteria involved in plaque formation and gum inflammation.
Randomised controlled trials of S. salivarius M18 have reported reductions in gingival bleeding and plaque scores over roughly three months of daily use.
Virae includes both strains in every lozenge, so one nightly dose covers breath, throat and gums. Most oral probiotics carry one strain or the other.
Randomised controlled trials of S. salivarius M18 on gingival bleeding and plaque, 2023 and 2024.
The strains
Why a lozenge and not a rinse or a capsule
A rinse is swallowed or spat within a minute and takes most of what it delivered with it. A capsule is swallowed on purpose. Neither leaves anything behind on the tongue.
A slowly dissolving lozenge coats the tongue and throat over several minutes, and taking it last thing at night means nothing washes it away for hours.
This is also why the instruction not to eat or drink afterwards matters more than it looks. It is the difference between placing the strains and rinsing them away.
Delivery format and residence time are central to oral probiotic colonisation.
The evidence
The 2006 clinical trial, in full
Burton and colleagues studied adults with confirmed halitosis, measured by instrument readings of volatile sulfur compounds rather than by self-report. Substantial was defined as a reduction of more than 100 parts per billion.
The protocol is worth stating precisely, because it is often summarised badly. Participants first had a short chlorhexidine reset, then took K12 lozenges. The reset cleared the existing film; the strain occupied the surface afterwards.
That is a one-off clearing step before colonisation, not a recommendation to rinse with antiseptic every day. Ongoing antiseptic use works against a live strain, which is why our guidance is to avoid it while you take Virae. If you want to mirror the trial exactly, do any reset before you start, not during.
Burton et al., 2006. Journal of Applied Microbiology, 100:754 to 764.
The evidence
The wider body of K12 research
A single trial is a data point. What makes K12 unusual in this category is the accumulated volume: over twenty published human studies, in different populations, by different groups, over two decades.
Findings vary in strength and not every study is about halitosis. Some concern throat infections, some general oral health. We are not claiming they all measure breath.
The point is narrower and still useful: this is a named, traceable strain with a public literature you can read, rather than an unnamed oral probiotic blend with no trail behind it.
Published human trials on Streptococcus salivarius K12, 2000 to present.
The evidence
Colonisation, and why it fades if you stop
Colonisation is not permanent installation. Studies of K12 show detectable presence during regular use, declining after supplementation ends.
That is the honest answer to whether Virae is a cure. It is not. It is an occupancy that you maintain, in the same way that brushing is not a cure for plaque.
It also explains our two most repeated instructions. Take it every night, because consistency is the mechanism. And give it 60 nights before judging, because the shift builds rather than switches on.
K12 colonisation and decline after cessation are documented in strain persistence studies.
The evidence
Safety and who should ask first
The species is one most people already carry. K12 has a long commercial history and a substantial published safety record in adults and children.
One lozenge a night is the dose. Taking more does not accelerate colonisation and is not how the trials were run.
If you are pregnant, breastfeeding, immunocompromised, or being treated for a serious medical condition, speak to your doctor before starting any probiotic. This wording is being confirmed with our supplier before launch.
Dr. Patel is a scientist specialising in the microbiome, with a particular focus on the oral microbiome and its role in human health. She contributes her expertise to the research and development of our formulations, helping translate emerging microbiome science into evidence-based nutritional interventions.
As Chief Science Officer, she oversees:
Evidence-based research into the oral microbiome and ingredient selection
Scientifically grounded formulation design and optimisation
Scientific rigour and accuracy from research through to the final product
Tackles the cause · Works overnight · Lasts all day
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