Check the order, not just the names
Descending order by weight is required and gives you a ceiling for the last-named ingredient. It is worth the ten seconds even when no individual amount is printed.
What A 'Probiotic Blend' Label Line Is Actually Required To Say
A 36 mg blend, three species names, no strain codes, no live count. Some of that is common industry practice. Only part of it is a legal floor. Here is where the line actually falls.
Prepared by the Sodatidedaily Editorial Desk · Medically reviewed by Dr. Pascale Carbonara, MD · Updated
Quick answer
Under FDA's dietary supplement labeling rules, a proprietary blend such as Sodatide's 36 mg Probiotic Blend has to name each dietary ingredient inside it by its common or usual name — for a probiotic, that generally means genus and species — and list those ingredients in descending order of predominance by weight, alongside the blend's total combined weight. That is the regulatory floor: species named, order by weight, one combined total. What federal labeling rules do not uniformly require is a strain designation for each organism or a colony-forming-unit (CFU) count. Sodatide's label meets the floor — three organisms named to genus and species, in a stated order, with a combined weight — and stops there, which is legally sufficient and considerably less than the fuller disclosure that probiotic-industry best-practice guidance recommends but does not require.
The label as printed
Sodatide's Supplement Facts panel lists a Probiotic Blend at 36 mg per one-capsule serving, followed by three organism names in this order: Bifidobacterium infantis, Clostridium butyricum, Akkermansia muciniphila. No individual amount appears beside any of the three, no strain code follows any of the three names, and no colony-forming-unit (CFU) figure appears anywhere on the panel, the front of the bottle, or in the material we were given. We transcribed the complete panel, including the other-ingredients line and the caution block, on this site's own label page.
That combination — species named, no strains, no CFU — is common across the probiotic supplement category, and it raises an obvious question: is any of it a legal requirement, or is all of it simply how the category has always done things? The two are not the same question, and conflating them is easy to do and worth untangling directly, because the answer changes what a reader is entitled to expect from any label carrying a blend like this one.
The two rules actually doing the work
One governs naming. One governs order. Between them, they set the floor this label sits on.
Common or usual name (21 CFR 101.4). FDA's general food-labeling regulation on ingredient naming requires that each ingredient in a multi-ingredient product be identified by its common or usual name. For a dietary ingredient derived from or consisting of a microorganism, industry and regulatory practice has settled on genus and species as the common or usual name — which is exactly the level of specificity Sodatide's label supplies for all three organisms. A strain designation (a specific identifier below the species level, the kind that typically follows a species name as a string of letters and numbers) is a further level of precision beyond genus and species, and 21 CFR 101.4 does not reach down to that level for a dietary ingredient the way it requires, say, a full chemical name for certain other ingredient categories.
Proprietary blend disclosure (21 CFR 101.36(c)). This is the rule that governs the blend line itself. It requires that a proprietary blend state its total weight and list its component dietary ingredients in descending order of predominance by weight. It does not require an amount beside each individual ingredient inside the blend — that is precisely the trade permitted by calling something a proprietary blend rather than disclosing each ingredient separately — and it does not mention colony-forming units at all, because the rule was written as a general nutrition-labeling provision, not a probiotic-specific one.
Put together, those two rules generate exactly the label in front of us: three names at the genus-and-species level, in a stated order, under one combined weight. That is not a coincidence or a loophole being exploited — it is what compliance with the actual text of the applicable regulations produces, for a blend of this kind, when a manufacturer discloses nothing beyond what is required.
What is not required, and where that comes from
Two things are commonly expected of a “good” probiotic label that neither 21 CFR 101.4 nor 21 CFR 101.36 requires: a strain designation for each organism, and a CFU count stating how many living cells are present, typically at the time of manufacture and sometimes guaranteed through end of shelf life.
The expectation that a label should carry both comes from industry best-practice guidance, not from the Code of Federal Regulations. The International Scientific Association for Probiotics and Prebiotics (ISAPP) publishes consumer-facing guidance stating that responsible manufacturers should list the genus, species, and strain of each organism in a product, and should state the potency — the number of live organisms — that a consumer can expect through the end of the product's shelf life, not merely at the moment of manufacture. That is a professional-association recommendation aimed at raising the standard across a category where the underlying regulation sets a comparatively low floor. It is good guidance, and a great many reputable probiotic brands follow it voluntarily. It is not federal law, and a label that does not follow it is not, for that reason alone, out of compliance with FDA's labeling rules.
The National Center for Complementary and Integrative Health (NCCIH), a U.S. federal research agency, makes a related but distinct point in its own public consumer information on probiotics: that probiotic effects are commonly strain-specific, meaning evidence for one strain of a species does not automatically transfer to a different strain of the same species. That is a scientific observation about how the evidence base works, not a labeling requirement — but it explains why ISAPP's voluntary guidance recommends strain-level naming in the first place. The gap between what this label states (species) and what the evidence is organized around (strain) is real, and it is the reason a species name alone tells a reader less than it might appear to.
About the product behind this blog
Sodatide's 36 mg Probiotic Blend names three organisms to genus and species, in descending order, with a combined weight and no individual amounts, no strain codes, and no CFU count. That is a fully compliant label under the rules this post walks through, and it is also a label that discloses less than ISAPP's voluntary best-practice guidance recommends.
Order NowRead the label firstThe floor, and the gap above it
It is worth stating this plainly, because the two kinds of claim get blended together constantly in consumer commentary about probiotic labels: a blend that names species, orders them by weight, and states a combined total is not violating any federal labeling requirement by leaving out strain codes and a CFU count. It has met the floor. A separate and entirely fair criticism — that the label discloses less than the category's own professional guidance recommends, and less than a buyer would need to match this product against a specific published strain-level study — is a best-practice argument, not a legal-compliance argument, and the two should not be presented as the same thing.
This distinction matters for how a reader should treat a label like this one. “This label is not legally required to disclose strain or CFU” and “this label cannot be matched to research written at the strain level” are both true statements at the same time, about the same three missing pieces of information, and they are not in tension — they are simply answering two different questions: what the law requires, and what the science actually needs to be checkable.
The one thing descending order actually tells you
Because 21 CFR 101.36(c) does require descending order by predominance, the order in which a blend lists its ingredients is not decorative — it carries one piece of real, checkable arithmetic, even without individual amounts.
With three ingredients sharing a combined 36 mg and listed in descending order, the ingredient named third — on this label, Akkermansia muciniphila — cannot exceed 12 mg (one-third of the total), and in practice is very likely to be smaller than that, since the first-named ingredient must be the largest share and the second at least as large as the third. That is a ceiling, not an amount, and it is the only arithmetic descending order permits for a blend like this one. It is also close to useless on its own for a probiotic specifically, because milligrams of freeze-dried biomass do not convert into a colony-forming-unit count without a stated potency figure, which this label does not supply for any of the three organisms.
So descending order is real information, correctly required, and genuinely limited in what it can tell a reader about a probiotic blend in particular. That combination — a real rule, correctly followed, that still leaves the most useful number unstated — is the recurring shape of this entire label, not a one-off gap.
A federal floor, not necessarily the only one
Everything in this post describes federal labeling law as it applies to dietary supplements marketed nationally, which is the relevant framework for a product sold online to buyers across the United States. FDA's regulations at 21 CFR 101.4 and 21 CFR 101.36 are the operative rules, and they are what this label has to satisfy regardless of which state a given buyer is in.
It is worth noting, for completeness, that “what the law requires” and “what a retailer chooses to disclose” can diverge even within full compliance. A manufacturer is free to publish more than the floor requires — a strain code, a CFU count, a certificate of analysis — and many do, particularly brands competing on transparency as a selling point within the probiotic category specifically. Sodatide's label has not made that additional disclosure. That is a legitimate commercial choice within a compliant label, not a violation of anything, and it is the choice this post has been describing throughout: meeting the floor rather than building above it.
Reading any blend line with this in hand
Species is the legal floor, strain is the evidence floor
A label naming only genus and species has met the labeling rule. Whether that is enough to check the product against a specific study is a separate, harder question.
No CFU count is common, not disqualifying
Its absence is not a labeling violation. It is, however, the single most useful number a probiotic label can carry, and its absence is worth noticing every time.
None of this is a criticism unique to one product. The same three checks — read the order, separate species from strain, notice whether a CFU figure exists — apply to any proprietary probiotic blend on any label, and the answer will differ from product to product. What stays constant is the regulation itself: descending order and genus-and-species naming are required everywhere in this category; strain codes and CFU counts are asked for by professional guidance and delivered at the manufacturer's discretion.
If your bottle disagrees
The bottle in your hand wins. If your own label states a strain designation or a CFU count that is not reflected here, send us the photograph at [email protected] and we will correct this page and say that we did.