Head to head · Hair, Skin & Nails
Nature's Bounty Optimal Solutions Hair, Skin & Nails Gummies vs OLLY Undeniable Beauty
OLLY scores higher overall (6.8 vs 6.6 out of 10), mainly on quality & purity and transparency. Nature's Bounty still leads on value.
Updated September 2026 from our full reviews · How we score
A budget biotin gummy with 70,000+ buyer ratings: 2,500 mcg biotin plus a little vitamin C and E for about $0.19 a day; weak evidence it helps without a deficiency.
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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.
We may earn a commission when you buy through these links — it never affects our scores. How we make money
We may earn a commission when you buy through these links — it never affects our scores. How we make money
The short answer
Choose Nature's Bounty if…
- Shoppers who want the lowest-cost beauty gummy
- People who prefer a chewable over pills
- Anyone wanting a cheap two-to-three-month biotin trial
- You care most about value
Choose OLLY if…
- Shoppers who want an independently certified beauty gummy
- People who prefer a tasty chewable over pills
- Nail-focused users willing to run a two-to-three-month trial
- You care most about quality & purity, transparency
Side by side
| Optimal Solutions Hair, Skin & Nails Gummies | Undeniable Beauty | |
|---|---|---|
| Our score | 6.6 / 10 | 6.8 / 10 |
| Efficacy (30%) | 4.6 | 4.7 |
| Quality & Purity (25%) | 6.8 | 8.3 |
| Value (20%) | 8.0 | 6.8 |
| Experience (15%) | 8.0 | 8.0 |
| Transparency (10%) | 7.0 | 8.0 |
| Form | Gummy | Gummy |
| Serving | 2 gummies40 servings per container | 2 gummies30 servings per container |
| Testing & certifications | None verified | NSF Contents Certified |
| Dietary | Gluten-free, Dairy-free, Soy-free | Gluten-free |
| Key ingredients |
|
|
| Flavors | 1 (Strawberry) | 1 (Grapefruit Glam) |
| Creator video reviews | 4 | 4 |
Pros and cons
Optimal Solutions Hair, Skin & Nails Gummies
- About $0.19 per daily serving for the 80-count bottle
- Fully disclosed label with no proprietary blend
- 4.6-star average across 70,000+ buyer ratings, with frequent praise for the taste
- Label warns to consult a doctor before clinical lab testing
- Free of milk, lactose, soy, gluten, wheat and fish, per the label
- Biotin at 8,333% DV has little evidence of benefit unless you are deficient
- No named third-party certification such as USP or NSF
- Contains gelatin and 2 g of added sugar per serving
- Buyers report gummies clumping together and some skin breakouts
Undeniable Beauty
- Certified to NSF/ANSI 173, so label contents are verified and contaminants screened
- Fully disclosed label, including the 50 mg keratin dose
- Natural-source vitamin E and no synthetic flavors or colors
- 4.5-star average across 14,000+ buyer ratings, with frequent praise for the taste
- Biotin at 8,333% DV has little evidence of benefit unless you are deficient
- Keratin dose is one-tenth of the 500 mg used in a published solubilized-keratin trial
- Costs more than twice as much per day as Nature's Bounty's similar biotin gummy
- Contains gelatin and 2 g of added sugar; some buyers report breakouts
Our verdicts
Optimal Solutions Hair, Skin & Nails Gummies
A cheap, pleasant-tasting and fully disclosed biotin gummy that delivers exactly what its label says. The problem is the premise: for most people without a deficiency, 2,500 mcg of biotin is unlikely to change hair, skin or nails. Buy it as a low-cost experiment if you like, and tell your clinician before any blood test.
Full review
Undeniable Beauty
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.
Full review
What creators say
Questions people ask
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