We Read the Label of 66 Women's Supplements. Here Is What They Actually Dose.

We read the published Supplement Facts panel of 66 supplements marketed to women in the United States, plus our own, and recorded the biotin dose per daily serving. Sixty-seven labels in total: 46 beauty supplements for hair, skin and nails, 17 competitor beef organ supplements, 3 women's multivitamins, and Women Bloom.

The finding that matters is not that the doses are high. It is that they are round. And the highest number in our own category is on our own label.

How did we collect the data?

Between 1 and 8 August 2026 we read the published Supplement Facts panel for each product and recorded the biotin content per daily serving. Where a serving was more than one capsule, gummy or scoop, we multiplied accordingly — a step that changes the answer more often than you would expect.

Vitafusion's Gorgeous Hair, Skin & Nails is a three-gummy serving. Country Life's Maxi-Hair Plus is four capsules. A per-capsule figure would have understated both by a factor of three or four, which is one reason published comparisons of this category disagree with each other.

Sources were, in order of preference: the NIH Dietary Supplement Label Database, which transcribes the printed panel; the brand's own website; then a major retailer listing. Where we could not read an actual panel, we excluded the product rather than estimate. Fourteen products were dropped for that reason, most because the brand publishes its panel only as an image with no quantity stated.

What this survey is not

It is a census of labels, not of the market. We did not weight by sales volume, and a product with one listing counts the same as a bestseller. It also measures one nutrient. A supplement is not good or bad because of its biotin figure.

What did we find?

Among the 46 beauty supplements, the median dose is 4,500 mcg including the seven products that contain no biotin at all, and 5,000 mcg among those that do. The NIH adequate intake for adult women is 30 mcg per day. A 5,000 mcg product is 167 times that figure. The highest we found, Zhou Nutrition's Hairfluence at 15,000 mcg, is 500 times.

The three women's multivitamins we read are a different world entirely: 0, 30 and 225 mcg. A multivitamin is formulated against reference intakes, so it doses biotin at roughly the reference intake. Nothing prevents a beauty supplement from doing the same. It simply is not what the category does.

Why do the doses cluster on round numbers?

Because the doses were not arrived at by research. A dose derived from evidence would scatter across odd values. These land on a handful of round marketing numbers: 14 products at exactly 5,000 mcg, 10 at exactly 2,500, six at exactly 10,000.

That clustering is the finding. It is the signature of a number chosen by looking at the shelf rather than at the literature — and it is visible from the outside, without access to a single formulation meeting.

How much biotin is in a beef organ supplement?

Almost none. Of the 17 competitor beef organ supplements we read, fifteen contain no added biotin whatsoever. The two that report any contain 4 mcg and 10 mcg per serving, both occurring naturally in the organ tissue rather than added. Not one of them exceeds 10 mcg.

That is the honest baseline for this category, and it is well below the 30 mcg adequate intake. Organ meats are the richest whole-food source of biotin there is — we looked at the numbers in how much biotin is in beef liver — but a capsule holds a fraction of a gram of liver, not a 3-ounce portion.

Where does that leave our own product?

As the outlier. Women Bloom is a beef organ supplement containing 10,000 mcg of biotin — 1,000 times the highest competitor in its own category, and 333 times the adequate intake. Across the whole survey it is tied with six beauty products for the second-highest dose, behind a single product at 15,000 mcg.

The 10,000 mcg does not come from the organ side of the formula. It is added, and it is added because that is the number the beauty category standardised on. Our five organs are listed by name and amount on the Supplement Facts page — 150 mg liver, 150 mg ovary, 100 mg each of kidney, heart and uterus — and 150 mg of freeze-dried liver cannot supply a figure like this. Nothing could.

We are publishing this because the number is on our label, and we would rather explain where it came from than hope nobody looks. If you want to read the panel yourself, it is on the Women Bloom product page in full, with no proprietary blend.*

What does the evidence actually say about biotin?

That the case for supplementing healthy people is weak. The NIH Office of Dietary Supplements states that claims for biotin on hair, nail and skin health are supported "at best, by only a few case reports and small studies".

A 2024 review in the Journal of Clinical and Aesthetic Dermatology — Yelich and colleagues, Biotin for Hair Loss: Teasing Out the Evidence — concluded that there have been no studies demonstrating biotin supplementation to be beneficial for hair growth in healthy individuals. The brittle-nail research most often cited used around 2.5 mg per day, not ten, and none of it recorded whether participants were deficient to begin with.

Deficiency does cause hair thinning and brittle nails. But the NIH states that severe biotin deficiency in healthy people eating a normal mixed diet has never been reported. Correcting a deficiency you do not have is not an improvement.*

So why is 10,000 mcg on our label?

Because a formula is judged on that line against the products beside it. That is a commercial reason, not a scientific one, and we are not going to dress it up as anything else. It is a dose we can defend on category convention. We cannot defend it on evidence, and we are not going to pretend the two are the same thing.

Is there a real risk to a 10,000 mcg dose?

Not of toxicity — but of a misread blood test. No Tolerable Upper Intake Level has been set for biotin, because there is no human evidence of toxicity at high intakes. The documented hazard is diagnostic: high-dose biotin interferes with laboratory assays that use biotin–streptavidin technology.

The FDA issued a safety communication in November 2017, updated it in November 2019, and reported a patient death following falsely low troponin results attributed to biotin interference. It maintains a published list of troponin assays still subject to that interference.

The dose at which interference has been documented is 10 mg. 10,000 mcg is 10 mg. That applies to our label and to the seven other products in this survey at 10,000 mcg or above. If you take any of them, say so before bloodwork — we set out what to tell the lab and how long to pause in a separate guide. The primary literature is indexed on PubMed if you would rather read it than take our summary.

Can you use this data?

Yes, freely, with attribution. If you are writing about biotin dosing, comparing supplements or checking a label, take it. A link back to this page is appreciated but not required.

This survey is one half of our label research. The same week, we scored 59 beef organ supplements on four label disclosures — a different question answered with the same method: read the published panel, record every row, publish the dataset.

Published under a Creative Commons Attribution 4.0 International licence (CC BY 4.0).

Cite as: Biotin Doses in Supplements Marketed to Women 2026, The Nutra Elmt Journal, August 2026.

The complete table of all 67 products follows. Doses are per daily serving as printed on the panel, read between 1 and 8 August 2026. Formulations change; check the current label before relying on any single row.

The full dataset

B = beauty (hair, skin & nails) · M = women's multivitamin · O = beef organ supplement. Doses in mcg per daily serving.

Brand	Product	Biotin (mcg)	× AI	Cat.
Solgar	Skin, Nails & Hair Advanced MSM	0	0×	B
HUM Nutrition	Red Carpet	0	0×	B
HUM Nutrition	Skin Squad Pre + Probiotic	0	0×	B
Ritual	HyaCera Skin Hydration	0	0×	B
Ancient Nutrition	Multi Collagen Beauty Within	0	0×	B
Lemme	Lemme Grow Capsules	0	0×	B
JSHealth	Hair + Energy Formula	0	0×	B
OUAI	Thinning Hair Supplement	100	3×	B
Vital Proteins	Beauty Boost Capsules	150	5×	B
Viviscal	Women's Hair Growth Supplement	240	8×	B
Nature's Bounty	Hair, Skin & Nails Pectin Gummies	2,500	83×	B
Nature Made	Hair Skin & Nails Softgels	2,500	83×	B
Nature Made	Hair, Skin and Nails Gummies	2,500	83×	B
OLLY	Undeniable Beauty	2,500	83×	B
Nature's Truth	Gorgeous Hair, Skin & Nails Gummies	2,500	83×	B
Equate	Hair, Skin and Nails Gummies	2,500	83×	B
Hairfinity	Healthy Hair Vitamins	2,500	83×	B
Well at Walgreens	Hair, Skin & Nails Gummies	2,500	83×	B
CVS Health	Hair, Skin & Nails Gummies	2,500	83×	B
Lemme	Lemme Glow	2,500	83×	B
Nature's Bounty	Hair, Skin & Nails 3000 mcg Caplets	3,000	100×	B
Spring Valley	Hair, Skin & Nails Caplets	3,000	100×	B
Mielle Organics	Adult Healthy Hair Formula	4,000	133×	B
Nature's Bounty	Extra Strength Hair, Skin & Nails 5000 mcg	5,000	167×	B
Vitafusion	Gorgeous Hair, Skin & Nails	5,000	167×	B
SugarBearHair	Hair Vitamins	5,000	167×	B
Sundown Naturals	Hair, Skin & Nails 5000 mcg	5,000	167×	B
Nature's Truth	Hair, Skin & Nails 5000 mcg	5,000	167×	B
Spring Valley	Extra Strength Hair, Skin & Nails	5,000	167×	B
Country Life	Maxi-Hair Plus	5,000	167×	B
Vital Vitamins	Biotin Complex Hair, Skin & Nails	5,000	167×	B
Hair La Vie	Revitalizing Hair Blend	5,000	167×	B
Nature's Way	Alive! Hair, Skin & Nails Gummies	5,000	167×	B
HUM Nutrition	Hair Strong Gummies	5,000	167×	B
Sports Research	Biotin 5,000 mcg	5,000	167×	B
Codeage	Sugar-Free Hair Skin Nails Gummies	5,000	167×	B
Codeage	Hair Skin Nails Platinum	5,000	167×	B
Nature's Bounty	Advanced Hair, Skin & Nails Gummies	6,000	200×	B
Equate	Advanced Hair, Skin & Nails Gummies	6,000	200×	B
NeoCell	Biotin Beauty Soft Chews	10,000	333×	B
Vital Proteins	Collagen Peptides + Biotin Hair Complex	10,000	333×	B
Sports Research	Biotin Max Strength 10,000 mcg	10,000	333×	B
Codeage	Hair Vitamins	10,000	333×	B
Codeage	Menopause Hair & Skin Vitamins+	10,000	333×	B
Lemme	Lemme Grow Soft Chews	10,000	333×	B
Zhou Nutrition	Hairfluence	15,000	500×	B
Ritual	Essential for Women 18+	0	0×	M
Perelel	Women's Daily Vitamin Trio	30	1×	M
Goli Nutrition	Women's Complete Multi Gummies	225	8×	M
Primal Queen	Female-Optimized Beef Organ Superfoods	0	0×	O
Left Coast Performance	Beef Organs For Women (120 ct)	0	0×	O
Left Coast Performance	Beef Organs For Women (60 ct)	0	0×	O
Micro Ingredients	Grass-Fed Beef Organ For Women	0	0×	O
Ancestral Supplements	Grass Fed Beef Organs	0	0×	O
Ancestral Supplements	Grass Fed Beef Liver	0	0×	O
Nutricost	Grass-Fed Desiccated Beef Liver	0	0×	O
ForestLeaf	Grass Fed Beef Liver	0	0×	O
ForestLeaf	Grass Fed Beef Organs 3000mg	0	0×	O
Herbage Farmstead	Grassfed Beef Organs 3,250 mg	0	0×	O
Designs for Health	Organ Synergy	0	0×	O
Perfect Supplements	Perfect Desiccated Liver	0	0×	O
Codeage	Grass-Fed Beef Organs	0	0×	O
Dense Nutrition	Grass-Fed Beef Organs	0	0×	O
Paleo Powders	Beef Organ Mix Grass-Fed	0	0×	O
MK Supplements	Grass-Fed Beef Organs	4	0×	O
MK Supplements	Grass-Fed Beef Liver	10	0×	O
Women Bloom (Nutra Elmt)	Women Bloom	10,000	333×	O

Last reviewed: August 2026. This page is general information, not medical advice.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.