Beauty
Biotin
Also known as: Vitamin B7, Vitamin H, Biotin (D-Biotin), d-biotin
A water-soluble B vitamin essential for hair, skin, and nail health and serves as a coenzyme in amino acid and glucose metabolism. D-biotin is the naturally active form.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Biotin product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Nutricost Collagen Powder for Women | 93 A | $1.27 |
| 2 | Garden of Life Vitamin Code Raw B-Complex | 89 A | $0.50 |
| 3 | MegaFood Skin, Nails & Hair 2 | 89 A | $0.87 |
| 4 | Thorne Advanced Nutrients | 88 A | $2.40 |
| 5 | Thorne Basic Nutrients 2/Day | 88 A | $0.60 |
| 6 | Thorne Basic Prenatal | 88 A | $1.23 |
| 7 | Thorne Men's Multi 50+ | 88 A | $1.87 |
| 8 | Nutricost Biotin Capsules | 87 A | $0.05 |
| 9 | Nutricost Biotin Softgels | 87 A | $0.11 |
| 10 | Pure Encapsulations Biotin 8 mg | 87 A | $0.22 |
| 11 | Jarrow Formulas Alpha Lipoic Sustain | 87 A | $0.40 |
| 12 | Garden of Life Vitamin Code 50 & Wiser Women | 87 A | $1.01 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Biotin should I take?
The typical range is 2500-5000mcg daily. 3-6 months for hair effects
When should I take Biotin?
Any time. Optional.
Which form of Biotin is best?
Capsules — Various doses. Other forms in the catalog: Gummies, d-biotin.
Is Biotin safe?
Commonly reported: Acne in some people. Serious warnings: Interferes with lab tests (thyroid, cardiac). Safe
Which Biotin supplement scores highest?
Nutricost Collagen Powder for Women, at 93/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Daily target & upper limit
30 mcg / dayBiotin has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:
Biotin dosage reference →Primary uses
- Hair health
- Nail strength
- Skin health
- Hair, skin, and nail health
- Glucose metabolism support
- Amino acid metabolism
- Keratin production
- Biotin deficiency prevention
What systematic reviews concluded
Outcomes that systematic reviews of Biotin reached a verdict on: 1 with no effect, 1 with harm reported. Each is quoted from a review and linked to it on PubMed. How these were read.
Reviews found no effect (1)
“meta-analysis showed no significant effect of vitamins A, B1, B6, B7, B12, and D on several visual parameters” PMID 41124782
Harm reported (1)
“Biotin ingested in moderate to high doses can cause immunoassay interference.” PMID 27362288
How it works
- Cofactor for keratin production
- Cellular energy
- Fatty acid metabolism
Dosage
- Typical range
- 2500-5000mcg daily
- Timing
- Any time
- With food
- Optional
- Duration
- 3-6 months for hair effects
- Special populations
- Hair loss (if deficient), brittle nails
Forms
- Capsules
- Gummies
- d-biotin· 70/100
Safety
Common side effects
- Acne in some people
Contraindications
- None
Products containing Biotin
Top-scoring supplements in our catalog that list Biotin on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Popular, but only helps if deficient
Grade B: Some human trials support key claims; further confirmation needed.
Related in Beauty
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.