An NSF-certified grapefruit gummy with 2,500 mcg biotin, 50 mg keratin and vitamins C and E: well made and well liked, but backed by weak hair-and-nail evidence.
Mixed
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Last reviewed September 29, 2026 by the Nutrition Reviews Editorial Team · How we review
Our verdict
Undeniable Beauty is one of the better-made beauty gummies: NSF certified, fully disclosed and widely liked for its taste. But it relies on the same high-dose biotin as cheaper rivals, and its 50 mg of keratin is a fraction of the studied amount. Think of it as a pleasant daily habit, not a fix for thinning hair.
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Our five-factor score out of 10. Factors are weighted by how much they matter to the outcome you’re paying for. Methodology
out of 10
Key ingredients at clinically studied doses, and how strong the evidence is.
Third-party testing and certifications, manufacturing standards, contaminant testing, recall history.
Cost per effective serving compared with category peers.
Taste, mixability, texture and tolerability from aggregated buyer and creator feedback.
Full label disclosure (no proprietary blends), available COAs, honest marketing.
OLLY Undeniable Beauty is a grapefruit-flavored ("Grapefruit Glam") gummy sold on Amazon, at Vitacost and on OLLY's own site. Two gummies provide 2,500 mcg of biotin (8,333% of the Daily Value), 15 mg of vitamin C (17% DV), 7.5 mg of vitamin E in its natural-source d-alpha form (50% DV) and 50 mg of solubilized keratin, with 15 calories and 2 g of added sugar. A 60-gummy bottle lasts a month and costs about $12.88 ($13.99 from OLLY), roughly $0.43 per day.
Its evidence problem is the same as other biotin gummies. A 2017 review found that every reported case of biotin improving hair or nails involved an underlying deficiency or condition, and a 2023 JAMA Dermatology systematic review did not list biotin among the hair supplements with the highest-quality evidence. Keratin is the ingredient that sets this formula apart, but a published 90-day, placebo-controlled trial of a solubilized keratin supplement in 50 women used 500 mg of keratin a day, plus vitamins and minerals. OLLY's 50 mg is one-tenth of that amount.
Quality is the strong point. NSF's certified dietary supplement database lists Undeniable Beauty under NSF/ANSI 173, which verifies label contents and screens for contaminants. The label is fully disclosed and states no synthetic flavors or colors, and OLLY is a Certified B Corporation.
Buyers often praise the taste and report faster nail growth. Amazon's review summary notes mixed skin results, including breakouts, and some reports of cramping. The gummies contain gelatin, the label says they are not intended for children, and anyone having blood work should mention the biotin, since high intakes can distort some lab results.
| Key ingredient | Per serving | Why it matters |
|---|---|---|
| Biotin (as D-biotin) Far above the 30 mcg Daily Value; benefits are documented mainly in deficiency, and high intakes can skew some lab tests. | 2500 mcg (8333% DV) | Far above the 30 mcg Daily Value; benefits are documented mainly in deficiency, and high intakes can skew some lab tests. |
| Keratin (solubilized) Structural protein of hair and nails; a published hair-and-nail trial of a solubilized keratin supplement used 500 mg a day. | 50 mg | Structural protein of hair and nails; a published hair-and-nail trial of a solubilized keratin supplement used 500 mg a day. |
| Vitamin E (as d-alpha tocopheryl acetate) Antioxidant vitamin in its natural-source form. | 7.5 mg (50% DV) | Antioxidant vitamin in its natural-source form. |
| Vitamin C (as ascorbic acid) Needed for normal collagen formation; a modest amount. | 15 mg (17% DV) | Needed for normal collagen formation; a modest amount. |
Supplement Facts
Serving Size 2 Gummies
Servings Per Container 30
* Percent Daily Values are based on a 2,000 calorie diet. † Daily Value not established.
Other ingredients: Glucose syrup, sugar, water, gelatin, pectin, citric acid, fruit and vegetable juice (color), sodium citrate, natural flavors, vegetable oil (coconut) and carnauba wax (to prevent sticking).
Processed in a facility with products that may contain soy, egg, peanuts, tree nuts, milk, fish, shellfish, wheat and sesame.
Flavors & variants
Testing & quality
Several OLLY products, including the Women's Multi and Men's Multi gummies, are listed in NSF's NSF/ANSI 173 dietary supplement certification database.
Goals it supports
Independent creators reviewing Undeniable Beauty on TikTok and YouTube.
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