Product Image

Keratin Hair Booster

Reserveage Nutrition
4.5
★ ★ ★ ★ ★
(1106 ratings)
Keratin 500 mg
Biotin 3000 mcg
Copper 1.7 mg
Product Image
Score65
A targeted dose of branded soluble keratin is useful, but basic minerals, a hidden blend, high biotin, and poor value hold back the larger bottle.
How scoring works
Quantity:120 Capsule(s) • (60 servings)
Goals:
Nail Health
Hair Health

Score 65

A targeted dose of branded soluble keratin is useful, but basic minerals, a hidden blend, high biotin, and poor value hold back the larger bottle.
How scoring works

Also available as

1 option
60 servings B7 3000 mcg, Copper 1.7 mg +1 more • 60 Capsule(s) • 30 servings $31.67 ($1.05 per serving)
$79.54($1.32 per serving)
iHerb
$ 79.54
Vitacost
$ 87.53
Report prices

Analysis

Five hundred milligrams of sheep's-wool Cynatine HNS provides a clearly sourced soluble keratin core. Biotin, zinc, copper, niacinamide, B6, and pantothenic acid add complementary nutrient support.

Zinc oxide and copper sulfate are inexpensive forms compared with stronger alternatives. The 40 mg Pro-Longevity Factors Blend does not disclose its components, so its contribution cannot be judged.

The larger bottle lasts longer but costs more per serving than the smaller version. Two capsules remain convenient, while high biotin creates an important laboratory-test issue.

Who is it for
  • Adults seeking soluble keratin for hair and nails
  • People who prefer a larger two-month bottle
Best for
  • Branded keratin supplementation
  • Hair and nail structural support

Pros

  • Provides 500 mg of soluble Cynatine HNS
  • Clearly identifies the sheep's-wool keratin source
  • Includes complementary B vitamins and minerals

Cons

  • Uses basic zinc and copper forms
  • Supporting blend lacks component disclosure
  • Higher serving cost than the smaller package

Warnings

  • The 3,000 mcg biotin amount can interfere with thyroid, cardiac, and other laboratory tests, so disclose use before testing
  • Sheep's-wool keratin may be unsuitable for people with a relevant wool-protein sensitivity

Nutrient quality

75 High impact

Keratin is identified, while zinc oxide and copper sulfate are less desirable mineral forms. The keratin and biotin amounts are substantial for a hair-focused supplement.

Ingredient transparency

66 High impact

Main active amounts are clear, but the longevity blend is not broken down. Inactive capsule ingredients are not supplied.

Customer satisfaction

67 High impact

The supplied average indicates generally favorable aggregate satisfaction. No detailed experience reports are available to identify repeated complaints or confirm perceived benefits.

Value for money

49 Lower impact

The meaningful keratin amount supports some of the cost, though the mineral forms are basic. Serving value is weak for a focused hair supplement.

Report analysis

Goals

Nail Health
Nail Health
Impact
Highest effect
A Goal FitA Strength of SupportA CoverageA- Formula Quality
Biotin · 3000 mcgKeratin · 500 mg

Soluble keratin and high-dose biotin directly support the nail plate and keratin production. Zinc, copper, and B vitamins add useful cellular cofactors.

The keratin and biotin amounts are substantial, although zinc oxide and copper sulfate are basic forms. High-dose biotin can interfere with thyroid, cardiac, and other laboratory tests.

Study evidence
Biotin Supportive 8 studies
Keratin Adverse 7 studies
Zinc No effect 1 study
Hair Health
Hair Health
Impact
Highest effect
A- Goal FitA Strength of SupportB+ CoverageA- Formula Quality
Biotin · 3000 mcgZinc · 15 mgKeratin · 500 mg

Soluble Cynatine HNS keratin, biotin, zinc, and copper create a strongly hair-focused combination. Evidence is most secure for correcting nutrient deficiencies, while the branded keratin has more direct structural relevance.

The keratin and biotin amounts reach focused-use ranges and are clearly disclosed. High-dose biotin can interfere with some laboratory tests and should be reported before blood work.

Study evidence
Biotin Supportive 4 studies
Copper Adverse 4 studies
Keratin Disputed 14 studies
Zinc Supportive 22 studies

Ingredients

IngredientAmount per serving
Vitamin B3 (Niacinamide)
 18 mg NE
Vitamin B6 (Pyridoxine Hydrochloride)
 2 mg
Biotin
3000 mcg
Pantothenic Acid (D-Calcium Pantothenate)
 14 mg
Zinc (Zinc Oxide)
 15 mg
Copper (Copper Sulfate)
 1.7 mg
Cynatine HNS (Sheep's Wool)
 500 mg
Pro-Longevity Factors Blend
40 mg
Gluten Free Adults 18–50
Report overview
Keratin (Sheep's Wool) · 500 mg OverallScore92
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyC Value

The branded Cynatine HNS form provides well-defined, absorption-focused keratin. A full targeted dose is clearly disclosed for focused hair and nail support. The high serving cost weakens value compared with otherwise similar branded-dose options.

View ingredientView products
Biotin · 3000 mcg OverallScore78
B+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyC Value

The focused-support biotin amount is paired with substantial keratin and several relevant micronutrients. Clean capsule delivery is favorable, but the active biotin isomer is not stated and a supporting blend lacks ingredient-level amounts. Supplemental biotin at this level may interfere with laboratory tests, so users should report it before blood work.

View ingredientView products
Copper (Copper Sulfate) · 1.7 mg OverallScore53
F Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyF Value

Copper sulfate is a lower-quality inorganic form despite clear elemental labeling. The copper amount is useful for maintenance, and zinc is balanced within the preferred proportion. The serving cost is high even after considering the added keratin and botanical blend.

View ingredientView products
Loading alternative details
92 Performance

Hair Skin & Nails Collagen Plus Formula

Life Extension
<p>Substantial collagen peptides and keratin directly strengthen hair, skin, and nail structural support. Basic mineral forms and a low silicon amount temper the otherwise focused, reasonably priced formula.</p>
84 Performance

Hair Ultra Softgels

OLLY
<p>Keratin, biotin, vitamin D3, zinc, and silicon provide a focused formula with fully disclosed doses. Keratin and silicon are modest, and very high biotin may interfere with laboratory tests.</p>
79 Performance

Hair Skin and Nails

Dr. Mercola
<p>Keratin and high-dose biotin provide direct structural support in a focused formula. The keratin source is unclear, hyaluronic acid is very low, and high biotin can distort thyroid and cardiac laboratory tests.</p>
58 Budget

One Daily Women's

Equate
<p>Practical daily vitamins and minerals include biotin, iron, calcium, and copper at a very low serving cost. The formula lacks keratin and collagen, while iron is unnecessary for users without increased iron needs.</p>
60 Budget

One Daily Women's

21st Century
<p>A broad daily nutrient profile supplies biotin and copper at a fraction of the serving cost. It does not provide keratin or collagen, and supplemental iron may not suit users without an iron need.</p>
80 Budget

Hair Skin & Nails

Nature Made
<p>Biotin, beta-carotene, vitamin C, zinc, and copper create a concise beauty formula at very low serving cost. Oxide minerals reduce form quality, and high biotin can interfere with laboratory tests.</p>
85 Value

Heavenly Hair Tropical Citrus

OLLY
<p>D-biotin, zinc citrate, silica, horsetail, keratin, and amla provide broad hair and nail support at lower serving cost. Keratin and botanical extracts are light, while high biotin can interfere with laboratory tests.</p>
82 Value

Longer Stronger Hair and Nails

Irwin Naturals
<p>Buffered vitamin C, useful mineral forms, biotin, horsetail, amino acids, and flax oil provide a broad hair-focused alternative at lower serving cost. Lysine and proline are modest and horsetail lacks complete silica detail.</p>
69 Value

Hair Multivitamin

California Gold Nutrition
<p>High-dose biotin, evening primrose oil, and several supporting nutrients create broad hair and nail coverage. Trace collagen, amino acids, and hyaluronic acid plus cupric oxide weaken value despite a slightly lower serving cost than some source packages.</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 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. 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
  4. Brittle nails: response to daily biotin supplementation.
    Hochman LG; Scher RK; Meyerson MS · Cutis · 1993
    Case series35 participantsNail Health forBiotin
  5. 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 Nail Health forZinc
  6. 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
  7. 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
  8. 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 forBiotin
  9. 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
  10. Menkes disease and response to copper histidine: An Indian case series.
    Yoganathan S; Sudhakar SV; Arunachal G; Thomas M; Subramanian A; George R; Danda S · Annals of Indian Academy of Neurology · 2022
    Case series4 participantsHair Health forCopper
  11. Trace element levels in alopecia areata.
    Bhat YJ; Manzoor S; Khan AR; Qayoom S · Indian journal of dermatology, venereology and leprology · 2009
    Case-control study100 participantsHair Health forCopper
  12. UV damage to hair and the effect of antioxidants and metal chelators.
    Millington KR; Marsh JM · International journal of cosmetic science · 2021
    In vitro / ex vivo studyHair Health forCopper
  13. Preserving fibre health: reducing oxidative stress throughout the life of the hair fibre.
    Marsh JM; Davis MG; Lucas RL; Reilman R; Styczynski PB; Li C; Mamak M; McComb DW; Williams RE; Godfrey S; Navqi KR; Chechik V · International journal of cosmetic science · 2016
    In vitro / ex vivo studyHair Health forCopper
  14. 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
  15. 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
  16. 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
  17. 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
  18. The effects of minoxidil, 1% pyrithione zinc and a combination of both on hair density: a randomized controlled trial.
    Berger RS; Fu JL; Smiles KA; Turner CB; Schnell BM; Werchowski KM; Lammers KM · The British journal of dermatology · 2003
    Randomized trial200 participantsHair Health forZinc
  19. Incubatory environment of the scalp impacts pre-emergent hair to affect post-emergent hair cuticle integrity.
    Schwartz JR; Henry JP; Kerr KM; Flagler MJ; Page SH; Redman-Furey N · Journal of cosmetic dermatology · 2018
    Randomized trialHair Health forZinc
  20. A comparison of hair quality and cosmetic acceptance following the use of two anti-dandruff shampoos.
    Draelos ZD; Kenneally DC; Hodges LT; Billhimer W; Copas M; Margraf C · The journal of investigative dermatology. Symposium proceedings · 2006
    Randomized trial40 participantsHair Health forZinc
  21. BMI and levels of zinc, copper in hair, serum and urine of Turkish male patients with androgenetic alopecia.
    Ozturk P; Kurutas E; Ataseven A; Dokur N; Gumusalan Y; Gorur A; Tamer L; Inaloz S · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) · 2015
    Case-control study216 participantsHair Health forZinc
  22. Analysis of serum zinc and copper concentrations in hair loss.
    Kil MS; Kim CW; Kim SS · Annals of dermatology · 2013
    Case-control study342 participantsHair Health forZinc
  23. 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
  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. 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
  26. Human keratin diseases: hereditary fragility of specific epithelial tissues.
    Corden LD; McLean WH · Experimental dermatology · 1997
    Narrative reviewNail Health forKeratin
  27. Phenotype and genotype features of Vietnamese children with pachyonychia congenita.
    Chu HT; Dinh Duong TA; Le DH; Le TV; Nguyen BB; Dang CV; Vu QV · Pediatrics and neonatology · 2023
    Case series7 participantsNail Health forKeratin