'Probiotic' Skincare Has No Live Bacteria In It. Neither Does Ours.

Position 51 of 52. That is where the word "Lactobacillus" sits on the ingredient list of a foaming wash we sell, with nothing after it. No "ferment", no "lysate", no strain name, no count. Just the genus, near the bottom of a preserved, shelf-stable, room-temperature bottle.

The product is called CLEETY Lacto Probiotics Rejuvenating Foaming Wash. The word is in the name. It is also in the hero ingredient line we wrote for it, and in the hero line we wrote for DR.BIO Eco Moisture Cream, which promises a "Probiotic Barrier Complex". Neither product contains a living organism.

This is the third time we have written up a clinical word arriving at a shelf with its meaning removed. We covered PDRN and exosomes in one piece already. This one is worse, because "probiotic" has a definition published in a peer-reviewed consensus statement, and because we are the ones using it wrong.

The definition is published, and it is short

In 2014 a panel convened by the International Scientific Association for Probiotics and Prebiotics published a consensus statement in Nature Reviews Gastroenterology & Hepatology. Hill, Guarner, Reid and colleagues restated the FAO/WHO wording without softening it: probiotics are "live microorganisms that, when administered in adequate amounts, confer a health benefit on the host".

Three conditions. Alive. Enough of them. A benefit that somebody showed.

The same paper shuts the door on the obvious workaround, stating that "dead microbes, microbial products, microbial components do not come under the probiotic classification". Then it names the commercial misuse directly, saying the term has "been clearly misused, for example, on products such as mattresses, shampoos, disinfectants and aftershave, for which maintenance of viability and efficacy of the microbes used are not established".

Shampoos and aftershave, in 2014. Cosmetics were on the list from the start.

ISAPP has not stopped saying it. Their own explainer on media coverage states that "misuse of these terms continues on product labels, in scientific publications, and in popular press communications", which is a polite way of recording that twelve years of consensus documents have moved almost no marketing copy anywhere.

Two of the labels are ours

Before anything else about the CLEETY wash: it carries a "Fragrance-free" chip on our own site, and it contains Melaleuca Alternifolia (Tea Tree) Leaf Oil at position 10 of 52, which our screening grades mid risk. The chip is wrong. We already published the count of eight products where our fragrance-free chips do not survive contact with the ingredient list, and this is one of the eight.

Its hero ingredient line reads "Lacto Probiotic Ferment Complex + Tea Tree + Prebiotics". The second offender is DR.BIO Eco Moisture Cream, whose hero line reads "Ceramide NP + Panthenol + Probiotic Barrier Complex". There is no probiotic barrier complex in that cream in any sense ISAPP would accept, because there is no live organism in it. It is a preserved moisturiser containing ferments and lysates, sitting at ambient temperature, which is exactly what a moisturiser should be.

We wrote that hero line ourselves, not DR.BIO.

The class is not rare in our range either. 26 of our 54 products contain at least one ferment, lysate or lacto-named ingredient, so this is close to half the catalogue rather than a two-product oddity.

CLEETY has the densest list of the lot. Fifty-two ingredients, screening score 9.5, and six entries that name the process honestly: Lactobacillus Ferment at 13, Aspergillus Ferment at 16, Lactobacillus Ferment Lysate at 21, Bifida Ferment Lysate at 26, Lactococcus Ferment Lysate at 27, Saccharomyces Ferment Lysate Filtrate at 28.

Then position 51 of 52.

The entry there is "Lactobacillus", and that is the whole entry. We cannot tell you what it is. An INCI-style name with no "ferment", "lysate" or "filtrate" qualifier says nothing about whether the material was ever alive, and nothing about whether anything in it is alive now. We do not know the strain. We do not know the concentration, because it sits second from last on a list of fifty-two and neither Korean nor EU labelling requires descending order below 1%. We do not know whether the culture was heat-killed, filtered, sonicated or simply fermented into a broth and then discarded. We asked the label and the label does not answer, and no competitor label we have read answers it either, which is the part that should bother people more than any single brand does.

Nothing stays alive in a preserved bottle

Cosmetic microbiology points the opposite way to probiotics, and it is not subtle about it. A 2020 Scientific Reports paper by Ryu and colleagues on contamination in custom-blended cosmetics sets out the Korean MFDS standard plainly: total aerobic microbe counts must stay below 100 CFU per gram or millilitre for cosmetics intended for children under three and below 1,000 for other cosmetic products, with E. coli, P. aeruginosa and S. aureus absent entirely. The authors note those figures line up with European and US limits.

A cosmetic safety standard is a ceiling on how many organisms are allowed to be present. A probiotic claim is a floor on how many are present. The same bottle cannot be describing both documents.

The formulation literature agrees from the other direction. A trade article in Pharmaceutical Technology on formulating topical products with live microorganisms as the active ingredient describes a very narrow window: only unusual vehicles, such as a 20% propylene glycol solution carrying no conventional preservative, kept bacteria viable at all, and even those lost organisms over time. It is an industry publication rather than a peer-reviewed study, and we are citing it as one. The same piece states that "well-crafted, vehicle-controlled clinical trial results are not generally available for topical semisolids containing live microorganisms".

Cosmetics with genuinely live organisms do exist. They are rare, and they show the constraint rather than breaking it: keeping organisms viable means removing the preservative system, which forces refrigeration, short dating and a cold chain that treats a face cream the way a Korean dairy treats yoghurt. Nothing that shipped at ambient temperature and now sits in a warm bathroom is doing any of that.

The ingredients hold up better than the word does

ISAPP returned in 2021 with a second consensus statement, Salminen, Collado, Endo and colleagues, defining the category skincare actually sells. A postbiotic is "a preparation of inanimate microorganisms and/or their components that confers a health benefit on the host".

"Inanimate" was chosen deliberately, to signal that the organisms were once alive and were then killed. Lysates and ferment products are inside the definition where a benefit is documented. Purified single metabolites are outside it, and so are undefined mixed cultures.

That is the correct name for what is in the CLEETY wash, for Bifida Ferment Lysate wherever it turns up, and for the Galactomyces filtrate we took apart separately.

The strongest trial in the class dates to 2010. Guéniche and colleagues ran a randomised, double-blind, placebo-controlled study in Experimental Dermatology on a cream containing a non-replicating Bifidobacterium longum lysate: 66 participants, 33 per arm, two months. The lysate arm showed significantly reduced sensitivity on a stinging test and better barrier recovery after tape-stripping, measured against placebo. It was L'Oréal-funded work on a L'Oréal ingredient, which you should weigh. It is also a real controlled trial with a real placebo arm, which is more than most cosmetic ingredients ever manage.

Say it plainly, because the takedown version of this article would get it backwards: the fair criticism is that calling these things "probiotic" is definitionally wrong, not that the ingredient class is worthless.

The weak end of the evidence looks like the 2023 Scientific Reports paper by Cui and colleagues on a lotion built around a probiotic ferment lysate. Water loss, redness and hydration all improved across 30 days. But the design was a single-arm "self-control" study with no placebo group and no vehicle group, so every result is measured against the same people's own baseline, and skin measurements drift on their own with season and handling. Several authors were employed by the company behind the product and disclosed the conflict.

One trial with a control arm, one without. Both get quoted in marketing copy the same way.

What our screening found

The practical takeaway

Read the ingredient list rather than the front of the bottle. "Ferment", "Ferment Lysate" and "Ferment Filtrate" are honest names, and the 2021 ISAPP definition covers what they are. The bare word "probiotic" on a room-temperature cosmetic does not survive the 2014 one.

That is not a reason to bin the product. The 2010 Guéniche trial is decent work, and a Bifida Ferment Lysate at position 26 of 52 is a sensible thing to find in a cleanser.

It is a reason to stop paying extra for the word, because the word carries no information. It cannot tell you a strain, a dose, or whether anything in the jar was ever alive. Our screening criteria grade named ingredients and disclosed concentrations, and here they have almost nothing to grade, because the label supplies almost nothing.

So, the verdict on our own two labels: the ingredients stay, the word goes. We are rewriting both hero lines to say ferment and lysate, which is what they contain. The product name belongs to the supplier and we cannot change it, so the front of that bottle will keep saying Probiotics while its ingredient list says otherwise, and now you know which one to believe.