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Undeniable Beauty Grapefruit Glam

OLLY
4.5
★ ★ ★ ★ ★
(2573 ratings)
Biotin 2500 mcg
Keratin 50 mg
Product Image
Score73
Best suited to people who value a convenient beauty gummy more than high-dose collagen or keratin; the 50 mg generic keratin amount is too small and insufficiently characterized to provide meaningful structural depth.
How scoring works
Quantity:60 Gummy(ies) • (30 servings)
Goals:
Hair Health
Nail Health
Skin Health

Score 73

Best suited to people who value a convenient beauty gummy more than high-dose collagen or keratin; the 50 mg generic keratin amount is too small and insufficiently characterized to provide meaningful structural depth.
How scoring works
$12.88($0.42 per serving)
iHerb
$ 12.99
Walmart
$ 12.88
Pure Formulas
$ 13.87
iHerb
$ 12.99
Vitacost
$ 13.89
Report prices

Analysis

A gummy beauty formula supplies 2,500 mcg biotin with vitamins C and E in an easy-to-use format. The disclosed amounts make the main contribution reasonably easy to judge.

The 50 mg generic keratin amount is too small and insufficiently characterized to provide meaningful structural depth. Practical value depends on whether the main active and format match the user’s priority.

The product is best suited to people who value a convenient beauty gummy more than high-dose collagen or keratin. Benefits for appearance, structure, or wellness should be viewed as nutritional support rather than a guaranteed visible change.

Who is it for
  • People who value a convenient beauty gummy more than high-dose collagen or keratin
  • Adults whose diet leaves a gap addressed by the core ingredients
  • Users comfortable with the listed format and serving size
Best for
  • Convenient two-gummy serving
  • Meaningful biotin amount
  • Users who accept that keratin amount is only 50 mg

Pros

  • Convenient two-gummy serving
  • Meaningful biotin amount
  • Includes antioxidant vitamins C and E
  • Reasonable serving value

Cons

  • Keratin amount is only 50 mg
  • Keratin source and processing are not disclosed
  • No meaningful collagen dose is listed
  • Gummy carbohydrates add little nutritional value

Warnings

  • The 2,500 mcg biotin amount may distort thyroid, hormone, or cardiac troponin blood tests; disclose use before testing.
  • Keratin source is not disclosed, so users with animal-protein allergies or dietary restrictions should verify it.
  • Gummy sweetener and flavor details are not supplied, so users with ingredient sensitivities should check the current label.

Nutrient quality

73 High impact

D-biotin and natural vitamin E are useful forms, and biotin is substantial, while keratin and vitamin C are modest. High biotin can distort some thyroid, hormone, and cardiac laboratory tests, while the active formula is compact and avoids unrelated additions.

Ingredient transparency

79 High impact

Specific amounts are listed for every supplied active ingredient. No proprietary blend hides active doses, while sweeteners, flavors, colors, and other gummy ingredients are not provided.

Customer satisfaction

70 High impact

The supplied aggregate satisfaction metric is favorable, and the large amount of aggregate feedback makes the metric highly stable. No review excerpts were provided, so recurring complaints and purpose-specific experiences cannot be checked.

Value for money

67 High impact

The targeted biotin and keratin formula supports fair value, though keratin is modest. The serving is moderately priced but relies mainly on biotin, while the formula avoids decorative extras.

Report analysis

Goals

Hair Health
Hair Health
Impact
High effect
B Goal FitC+ Strength of SupportD+ CoverageB+ Formula Quality
Biotin · 2500 mcgVitamin C · 15 mgKeratin · 50 mg

Biotin supports keratin production, while keratin supplies material related to the hair shaft. The combination is relevant to hair structure, although the keratin amount is small and biotin mainly helps when status is inadequate.

Vitamin C and vitamin E add antioxidant support but do not address iron, zinc, vitamin D, or stress pathways. The high biotin amount can interfere with thyroid, cardiac, and other laboratory tests, so users should tell the testing clinician about it.

Study evidence
Biotin Supportive 4 studies
Keratin Disputed 14 studies
Vitamin C Mixed 5 studies
Vitamin E No effect 3 studies
Nail Health
Nail Health
Impact
Moderate effect
C- Goal FitF Strength of SupportC- CoverageB Formula Quality
Biotin · 2500 mcgKeratin · 50 mg

Biotin provides a relevant route to nail health. Dose or form uncertainty limits confidence in the practical contribution.

Several complementary pathways broaden the formula. Undeniable Beauty Grapefruit Glam is best viewed as targeted support rather than proof of a clinical benefit.

Study evidence
Biotin Supportive 8 studies
Skin Health
Skin Health
Impact
Moderate effect
D Goal FitD+ Strength of SupportD+ CoverageC+ Formula Quality
Vitamin C · 15 mgVitamin E · 7.5 mg

Keratin, vitamin C, vitamin E, and biotin offer a plausible beauty-oriented combination, but evidence for improving skin is limited. The low antioxidant amounts and small keratin serving provide less support than collagen peptides or established hydration actives.

D-biotin and antioxidant forms are identified, while the keratin source and processing are not described. Biotin at 2,500 mcg can interfere with thyroid and cardiac blood tests, so the testing clinician or laboratory should be informed.

Study evidence
Biotin Supportive 10 studies
Vitamin C Supportive 53 studies
Vitamin E Supportive 38 studies

Ingredients

IngredientAmount per serving
Calories
15 Calorie(s)
Total Carbohydrates
3 Gram(s)
Vitamin C (Ascorbic Acid)
 15 mg
Vitamin E (D-Alpha-Tocopheryl Acetate)
 7.5 mg
Biotin (D-Biotin)
 2500 mcg
Keratin
50 mg
Gluten Free Adults 18–50
Report overview
Biotin (D-Biotin) · 2500 mcg OverallScore78
B+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyC Value

The active d-biotin form is clearly disclosed at a useful targeted amount. The gummy format is less clean than a capsule, while keratin and antioxidant vitamins add beauty-focused support. Biotin at this amount may interfere with some laboratory tests, and the broader formula supports a neutral value assessment.

View ingredientView products
Keratin · 50 mg OverallScore30
F Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyD- Value

The label discloses only generic keratin without a source or absorption-focused processing. Its amount is low for use as the main structural protein in a hair and nail formula. The serving is inexpensive, but the limited and unprocessed keratin weakens its active-value case.

View ingredientView products
Loading alternative details
88 Performance

Hydrolyzed Keratin

Doctor's Best
<p>Branded hydrolyzed keratin provides a well-defined, targeted amount in a focused single-active formula. Compared with the original, its ingredient design is clearer or more purposeful for part of biotin and keratin support for hair and nails, although it may not replace every function.</p>
65 Performance

Keratin Care

Bluebonnet Beautiful Ally
<p>Branded soluble keratin is supplied at a meaningful amount and directly fits hair and nail support. Compared with the original, its ingredient design is clearer or more purposeful for part of biotin and keratin support for hair and nails, although it may not replace every function.</p>
68 Performance

Keratin Hair Booster

Reserveage Nutrition
<p>A meaningful keratin amount and high biotin directly fit hair and nail support, but zinc oxide and copper sulfate are basic forms. Compared with the original, its ingredient design is clearer or more purposeful for part of biotin and keratin support for hair and nails, although it may not replace every function.</p>
82 Budget

Biotin 1000 mcg

Spring Valley
<p>The moderate biotin amount uses the active d-biotin isomer and provides focused support mainly when biotin intake is inadequate. Its lower serving cost improves affordability compared with the original, though the narrower or different formula changes how it addresses biotin and keratin support for hair and nails.</p>
84 Budget

Biotin 10000 mcg

Nature's Bounty
<p>The very high biotin amount uses the active d-biotin isomer and provides focused support mainly when biotin intake is inadequate. Its lower serving cost improves affordability compared with the original, though the narrower or different formula changes how it addresses biotin and keratin support for hair and nails.</p>
83 Budget

Biotin 5000 mcg

Doctor's Best
<p>5,000 mcg biotin provides a clearly quantified core formula, though the active is plainly named but its d-biotin isomer is not confirmed. Its lower serving cost improves affordability compared with the original, though the narrower or different formula changes how it addresses biotin and keratin support for hair and nails.</p>
89 Value

Biotin 10000 mcg

California Gold Nutrition
<p>Explicit d-biotin labeling, a very high amount, and a simple softgel provide excellent form quality and cost efficiency for focused hair and nail supplementation. Its disclosed formula and serving economics provide a practical quality-to-cost trade-off for biotin and keratin support for hair and nails, with suitability depending on its narrower focus.</p>
80 Value

Biotin

Jarrow Formulas
<p>The 5,000 mcg biotin amount is clearly disclosed and provides concentrated support for uses tied to low biotin status. Its disclosed formula and serving economics provide a practical quality-to-cost trade-off for biotin and keratin support for hair and nails, with suitability depending on its narrower focus.</p>
82 Value

High Potency Biotin 10 mg

Country Life
<p>The very high biotin amount uses the active d-biotin isomer and provides focused support mainly when biotin intake is inadequate. Its disclosed formula and serving economics provide a practical quality-to-cost trade-off for biotin and keratin support for hair and nails, with suitability depending on its narrower focus.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. The Role of Sesbania grandiflora-Derived Biotin and Bambusa arundinacea-Derived Silica Extracts in Promoting Hair, Skin, and Nail Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study.
    Patel MN; Maheshvari J; Patel N · Cureus · 2025
    Randomized trial105 participantsHair Health Nail Health Skin Health forBiotin
  2. The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity.
    Soleymani T; Lo Sicco K; Shapiro J · Journal of drugs in dermatology : JDD · 2018
    Narrative reviewHair Health forBiotin
  3. Vitamins A, B, C, and D: A Short Review for the Dermatologist.
    Coerdt KM; Goggins CA; Khachemoune A · Alternative therapies in health and medicine · 2021
    Narrative reviewHair Health forBiotin
  4. The Effects of an Oral Supplementation of a Natural Keratin Hydrolysate on Skin Aging: A Randomized, Double-Blind, Placebo-Controlled Clinical Study in Healthy Women.
    Tursi F; Nobile V; Cestone E; De Ponti I; Lepoudere A; Sergheraert R; Soulard JP · Journal of cosmetic dermatology · 2025
    Randomized trialHair Health Nail Health forKeratin
  5. Halloysite/Keratin Nanocomposite for Human Hair Photoprotection Coating.
    Cavallaro G; Milioto S; Konnova S; Fakhrullina G; Akhatova F; Lazzara G; Fakhrullin R; Lvov Y · ACS applied materials & interfaces · 2021
    In vitro / ex vivo studyHair Health forKeratin
  6. A variable monilethrix phenotype associated with a novel mutation, Glu402Lys, in the helix termination motif of the type II hair keratin hHb1.
    Winter H; Labrèze C; Chapalain V; Surlève-Bazeille JE; Mercier M; Rogers MA; Taieb A; Schweizer J · The Journal of investigative dermatology · 1998
    Case series3 participantsHair Health forKeratin
  7. Biotin for the treatment of nail disease: what is the evidence?
    Lipner SR; Scher RK · The Journal of dermatological treatment · 2018
    Narrative reviewNail Health forBiotin
  8. Treatment of brittle fingernails and onychoschizia with biotin: scanning electron microscopy.
    Colombo VE; Gerber F; Bronhofer M; Floersheim GL · Journal of the American Academy of Dermatology · 1991
    Other32 participantsNail Health forBiotin
  9. Brittle nails: response to daily biotin supplementation.
    Hochman LG; Scher RK; Meyerson MS · Cutis · 1993
    Case series35 participantsNail Health forBiotin
  10. Comparative Analysis of Type I Keratin Expression By Nail Consistency: An Immunohistochemistry Study.
    Mingorance Álvarez E; Rodríguez-León J; Pérez Pico AM; Mayordomo R · Applied immunohistochemistry & molecular morphology : AIMM · 2022
    Cross-sectional study32 participantsNail Health forKeratin
  11. Exposure to toxic agents alters organic elemental composition in human fingernails.
    Schumacher E; Dindorf W; Dittmar M · The Science of the total environment · 2009
    Cross-sectional study120 participantsNail Health forKeratin
  12. Low serum biotinidase activity in children with valproic acid monotherapy.
    Schulpis KH; Karikas GA; Tjamouranis J; Regoutas S; Tsakiris S · Epilepsia · 2001
    Clinical trial125 participantsHair Health Skin Health forBiotin
  13. Annurca Apple Nutraceutical Formulation Enhances Keratin Expression in a Human Model of Skin and Promotes Hair Growth and Tropism in a Randomized Clinical Trial.
    Tenore GC; Caruso D; Buonomo G; D'Avino M; Santamaria R; Irace C; Piccolo M; Maisto M; Novellino E · Journal of medicinal food · 2018
    Randomized trialHair Health forKeratin
  14. Keratin/alginate hybrid hydrogels filled with halloysite clay nanotubes for protective treatment of human hair.
    Cavallaro G; Caruso MR; Milioto S; Fakhrullin R; Lazzara G · International journal of biological macromolecules · 2022
    In vitro / ex vivo studyHair Health forKeratin
  15. Patient Satisfaction and Adverse Effects Following the use of Topical Hair Fiber Fillers.
    Babadjouni A; Juhasz M; Pham C; Csuka E; Hedayati B; Evron E; Mesinkovska NA · International journal of trichology · 2024
    Cross-sectional study40 participantsHair Health forKeratin
  16. Management of hair loss associated with endocrine therapy in patients with breast cancer: an overview.
    Karatas F; Sahin S; Sever AR; Altundag K · SpringerPlus · 2016
    Narrative reviewHair Health forVitamin C
  17. Elucidating causal relationships of diet-derived circulating antioxidants and the risk of non-scarring alopecia: A Mendelian randomization study.
    Ba Y; Shen L; Peng X; Zhang Y; Wang J · Medicine · 2024
    Methods validation study201,019 participantsHair Health forVitamin C
  18. Alterations of plasma antioxidants and mitochondrial DNA mutation in hair follicles of smokers.
    Liu CS; Chen HW; Lii CK; Tsai CS; Kuo CL; Wei YH · Environmental and molecular mutagenesis · 2002
    Observational studyHair Health forVitamin C
  19. Removal of synthetic hair dye using formamidine sulfinic acid and other sulfinate precursors.
    Hawkes JA; Lewis DM; Mama J; Murray J · International journal of cosmetic science · 2026
    Methods validation studyHair Health forVitamin C
  20. A Zinc Sulphate-Resistant Acrodermatitis Enteropathica Patient with a Novel Mutation in SLC39A4 Gene.
    Kilic M; Taskesen M; Coskun T; Gürakan F; Tokatli A; Sivri HS; Dursun A; Schmitt S; Küry S · JIMD reports · 2013
    Case reportHair Health forVitamin C
  21. Effects of tocotrienol supplementation on hair growth in human volunteers.
    Beoy LA; Woei WJ; Hay YK · Tropical life sciences research · 2014
    Randomized trial38 participantsHair Health forVitamin E
  22. Effects of dietary supplements on androgenetic alopecia: a systematic review and network meta-analysis.
    Zhou L; Zhu W; Chen Y · Frontiers in nutrition · 2026
    Meta-analysis1,658 participants19 studies pooledHair Health forVitamin E
  23. Evaluation of the Safety and Effectiveness of Nutritional Supplements for Treating Hair Loss: A Systematic Review.
    Drake L; Reyes-Hadsall S; Martinez J; Heinrich C; Huang K; Mostaghimi A · JAMA dermatology · 2023
    Systematic review30 studies pooledHair Health forVitamin E
  24. Treatment of brittle nail with a hydroxypropyl chitosan-based lacquer, alone or in combination with oral biotin: A randomized, assessor-blinded trial.
    Chiavetta A; Mazzurco S; Secolo MP; Tomarchio G; Milani M · Dermatologic therapy · 2020
    Randomized trial50 participantsNail Health forBiotin
  25. Vitamins and minerals: their role in nail health and disease.
    Scheinfeld N; Dahdah MJ; Scher R · Journal of drugs in dermatology : JDD · 2007
    Narrative reviewNail Health forBiotin
  26. Evaluation of biophysical skin parameters and hair changes in patients with acne vulgaris treated with isotretinoin, and the effect of biotin use on these parameters.
    Aksac SE; Bilgili SG; Yavuz GO; Yavuz IH; Aksac M; Karadag AS · International journal of dermatology · 2021
    Non-randomized trial60 participantsSkin Health forBiotin
  27. Generalized seborrhoeic dermatitis. Clinical and therapeutic data of 25 patients.
    Messaritakis J; Kattamis C; Karabula C; Matsaniotis N · Archives of disease in childhood · 1976
    Non-randomized trial25 participantsSkin Health forBiotin
  28. Holocarboxylase synthetase deficiency: novel clinical and molecular findings.
    Tammachote R; Janklat S; Tongkobpetch S; Suphapeetiporn K; Shotelersuk V · Clinical genetics · 2010
    Case series4 participantsSkin Health forBiotin
  29. Evaluation of the anti-wrinkle effect of an ascorbic acid-loaded dissolving microneedle patch via a double-blind, placebo-controlled clinical study.
    Lee C; Yang H; Kim S; Kim M; Kang H; Kim N; An S; Koh J; Jung H · International journal of cosmetic science · 2017
    Randomized trial23 participantsSkin Health forVitamin C
  30. Comparative Study on the Outcome of Periorbital Wrinkles Treated with Laser-Assisted Delivery of Vitamin C or Vitamin C Plus Growth Factors: A Randomized, Double-blind, Clinical Trial.
    Machado BHB; Frame J; Zhang J; Najlah M · Aesthetic plastic surgery · 2021
    Randomized trial149 participantsSkin Health forVitamin C
  31. Randomized trial of topical ascorbic acid in DMSO versus imiquimod for the treatment of basal cell carcinoma.
    Burke B; Bailie JE · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie · 2022
    Randomized trial25 participantsSkin Health forVitamin C
  32. Vitamin C improves healing of foot ulcers: a randomised, double-blind, placebo-controlled trial.
    Gunton JE; Girgis CM; Lau T; Vicaretti M; Begg L; Flood V · The British journal of nutrition · 2022
    Randomized trial16 participantsSkin Health forVitamin C
  33. Dietary nutrient intakes and skin-aging appearance among middle-aged American women.
    Cosgrove MC; Franco OH; Granger SP; Murray PG; Mayes AE · The American journal of clinical nutrition · 2007
    Cross-sectional study4,025 participantsSkin Health forVitamin C
  34. Randomized controlled trial using vitamins E and D supplementation in atopic dermatitis.
    Javanbakht MH; Keshavarz SA; Djalali M; Siassi F; Eshraghian MR; Firooz A; Seirafi H; Ehsani AH; Chamari M; Mirshafiey A · The Journal of dermatological treatment · 2011
    Randomized trial45 participantsSkin Health forVitamin E
  35. Serum vitamin E levels and chronic inflammatory skin diseases: A systematic review and meta-analysis.
    Liu X; Yang G; Luo M; Lan Q; Shi X; Deng H; Wang N; Xu X; Zhang C · PloS one · 2022
    Meta-analysis20 studies pooledSkin Health forVitamin E
  36. Evidence-Based Nutritional Interventions in Wound Care.
    Saeg F; Orazi R; Bowers GM; Janis JE · Plastic and reconstructive surgery · 2021
    Systematic review2,339 participants36 studies pooledSkin Health forVitamin E
  37. Effects of tocotrienol on aging skin: A systematic review.
    Ghazali NI; Mohd Rais RZ; Makpol S; Chin KY; Yap WN; Goon JA · Frontiers in pharmacology · 2022
    Systematic reviewSkin Health forVitamin E
  38. Carotenoids and carotenoids plus vitamin E protect against ultraviolet light-induced erythema in humans.
    Stahl W; Heinrich U; Jungmann H; Sies H; Tronnier H · The American journal of clinical nutrition · 2000
    Randomized trialSkin Health forVitamin E