Biotin supplements, compared
5 products we’ve reviewed list biotin as a key ingredient. Here’s what it does, what the research uses — and how much each product actually contains.
What it is
A B vitamin heavily marketed for hair, skin and nails. Benefits are clearest in people who are deficient, which is uncommon.
What the research uses
Adults need about 30 mcg a day; many beauty supplements contain far more.
High-dose biotin can distort some lab tests, including tests for heart attacks and thyroid function — tell your doctor before blood work.
Educational information, not medical advice. Talk to a healthcare professional before starting a supplement, especially if you are pregnant, nursing or take medication.
Every product, dose by dose
| Product | Biotin per serving | Form | Score |
|---|---|---|---|
 NSF Contents Certified | 150 mcgBiotin (as D-biotin) | Gummy | 7.3 |
 | 240 mcg (800% DV) | Tablet | 7.0 |
 NSF Contents Certified | 2500 mcg (8333% DV)Biotin (as D-biotin) | Gummy | 6.8 |
 | 2,500 mcg (8,333% DV)Biotin (as d-biotin) | Gummy | 6.6 |
 Clean Label Project | 300 mcgBiotin (as D-biotin) | Liquid | 6.5 |
Amounts are per serving as printed on each label. “Not disclosed” usually means the ingredient sits inside a proprietary blend.
Questions people ask
How much biotin do studies use?
Adults need about 30 mcg a day; many beauty supplements contain far more.
Which biotin supplement scores highest?
In our reviews, OLLY Women's Multi scores highest at 7.3/10, followed by Viviscal Hair Growth Supplement (7.0) and OLLY Undeniable Beauty (6.8). Scores weigh efficacy, quality, value, experience and transparency — not just the dose.
How much biotin is in these products?
It varies by product and serving size — for example OLLY Women's Multi (150 mcg), Viviscal Hair Growth Supplement (240 mcg (800% DV)), OLLY Undeniable Beauty (2500 mcg (8333% DV)). The table above lists the amount per serving for every product we've reviewed.