Head to head · Hair, Skin & Nails
OLLY Undeniable Beauty vs Viviscal Hair Growth Supplement
Viviscal scores higher overall (7.0 vs 6.8 out of 10), mainly on efficacy. OLLY still leads on quality & purity, value, experience and transparency.
Updated September 2026 from our full reviews · How we score
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.
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A drug-free hair supplement built on the AminoMar marine complex plus zinc, vitamin C and modest biotin, with company-funded trials; cheaper than Nutrafol but still pricey.
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 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, value, experience, transparency
Choose Viviscal if…
- Women with stress-, illness- or postpartum-related shedding (after pregnancy and nursing)
- People who want a disclosed label with modest biotin
- Buyers who prefer a two-tablet daily routine
- You care most about efficacy
Side by side
| Undeniable Beauty | Hair Growth Supplement | |
|---|---|---|
| Our score | 6.8 / 10 | 7.0 / 10 |
| Efficacy (30%) | 4.7 | 7.2 |
| Quality & Purity (25%) | 8.3 | 7.0 |
| Value (20%) | 6.8 | 6.3 |
| Experience (15%) | 8.0 | 7.2 |
| Transparency (10%) | 8.0 | 7.5 |
| Form | Gummy | Tablet |
| Serving | 2 gummies30 servings per container | 2 tablets30 servings per container |
| Testing & certifications | NSF Contents Certified | None verified |
| Dietary | Gluten-free | — |
| Key ingredients |
|
|
| Flavors | 1 (Grapefruit Glam) | — |
| Creator video reviews | 4 | 4 |
Pros and cons
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
Hair Growth Supplement
- AminoMar marine complex (1,072 mg) with trial data
- Favorable mention in a 2023 JAMA Dermatology systematic review
- Full label disclosure with modest 240 mcg biotin
- Recommended by board-certified dermatologists on TikTok
- About half Nutrafol's monthly cost
- No named third-party certification
- Trials are small and company-funded
- Some buyers report stomach upset or constipation
- Marine ingredients (oyster extract) rule it out for shellfish allergies
Our verdicts
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
Hair Growth Supplement
One of the better-supported hair supplements, with a transparent label and a sensible biotin dose, at a lower monthly cost than Nutrafol. The evidence is still small and company-funded and there is no third-party certification, so treat it as a three-to-six-month experiment alongside a proper diagnosis.
Full review
What creators say
Questions people ask
Is OLLY better than Viviscal?
Are OLLY and Viviscal third-party tested?
Who should choose OLLY over Viviscal?
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