Product Image

Longer Stronger Hair and Nails

Irwin Naturals
4.6
★ ★ ★ ★ ★
(1277 ratings)
Copper 1 mg
Manganese 5 mg
Biotin 2600 mcg
Proline 80 mg
Horsetail 160 mg
Product Image
Score74
Biotin, horsetail-derived silica, zinc picolinate, vitamin C, lysine, and proline address nail growth, cross-linking, and connective-tissue support. Lysine and proline are modest and horsetail does not reveal silica yield, while the concentrated biotin may interfere with some blood tests.
How scoring works
Quantity:60 Softgel(s) • (30 servings)
Goals:
Nail Health
Hair Health

Score 74

Biotin, horsetail-derived silica, zinc picolinate, vitamin C, lysine, and proline address nail growth, cross-linking, and connective-tissue support. Lysine and proline are modest and horsetail does not reveal silica yield, while the concentrated biotin may interfere with some blood tests.
How scoring works

Also available as

1 option
120 servings 2 Liquid Softgel(s) • 120 Softgel(s) • 60 servings $34.99 ($0.58 per serving)
$19.99($0.66 per serving)
iHerb
$ 19.99
Pure Formulas
$ 19.99
Amazon
$ 19.99
Vitacost
$ 19.99
Report prices

Analysis

Biotin, horsetail-derived silica, zinc picolinate, vitamin C, lysine, and proline address nail growth, cross-linking, and connective-tissue support. The targeted combination is strong, although the horsetail extract does not disclose a standardized silica yield.

Biotin, vitamin C, zinc picolinate, chelated copper, flax oil, horsetail, and gotu kola form a coherent hair-and-nail blend with several useful forms. Lysine and proline are modest and horsetail does not reveal silica yield, while the concentrated biotin may interfere with some blood tests.

Vitamin C, copper, manganese, zinc, and horsetail-derived silica offer limited matrix-related support. The very small calcium amount and absence of vitamin D, vitamin K, and magnesium leave mineralization poorly covered.

Who is it for
  • Adults seeking Nail Health support
  • People comfortable with a multi-ingredient softgel formula
  • Users who can review the ingredient list against medicines and existing supplements
Best for
  • Nail Health
  • Hair Health
  • Bone Health

Pros

  • Biotin, horsetail-derived silica, zinc picolinate, vitamin C, lysine, and proline address nail growth, cross-linking, and connective-tissue support
  • Strongest formulation fit is Nail Health
  • Main label amounts are disclosed for Vitamin C, Biotin, Calcium
  • Includes a meaningful Copper component

Cons

  • modest and horsetail does not reveal silica yield, while the concentrated biotin may interfere with some blood tests
  • Weak fit for Bone Health
  • Several secondary ingredients add breadth without equally strong dose or form support
  • Long ingredient list makes the combined effects and trade-offs harder to predict

Warnings

  • Lysine and proline are modest and horsetail does not reveal silica yield, while the concentrated biotin may interfere with some blood tests.

Nutrient quality

75 High impact

Useful mineral forms, buffered vitamin C, and several structural ingredients fit hair and nail support. Modest amino acids and concentrated biotin keep dosing from being fully balanced.

.

Ingredient transparency

80 Highest impact

Most active ingredients and their amounts are clearly listed. Daily directions, a complete excipient panel, and some form details are missing from the supplied data.

.

Customer satisfaction

66 High impact

The aggregate rating is favorable and supported by solid feedback volume. Complaint-level experiences are unavailable, so repeated drawbacks and purpose fit remain uncertain.

.

Value for money

73 High impact

The serving cost is reasonable for the documented core ingredients. Form, disclosure, or focus limitations keep category value from standing out.

.
Report analysis

Goals

Nail Health
Nail Health
Impact
Highest effect
B+ Goal FitB- Strength of SupportB+ CoverageB+ Formula Quality
Biotin · 2600 mcgHorsetail · 160 mg

Biotin, horsetail-derived silica, zinc picolinate, vitamin C, lysine, and proline address nail growth, cross-linking, and connective-tissue support. The targeted combination is strong, although the horsetail extract does not disclose a standardized silica yield.

Flaxseed oil adds lipid support and the liquid softgel may suit fat-soluble ingredients, while gotu kola and BioPerine are less central. The substantial biotin amount can interfere with some laboratory tests, so users should tell the testing clinician before blood work.

Study evidence
Biotin Supportive 8 studies
Horsetail Not classified

No linked studies yet.

Vitamin C Supportive 1 study
Zinc No effect 1 study
Hair Health
Hair Health
Impact
High effect
B Goal FitC+ Strength of SupportB+ CoverageA- Formula Quality
Biotin · 2600 mcgZinc · 10 mgLysine · 80 mgVitamin C · 200 mg

Biotin, zinc, copper, horsetail silica, lysine, proline, vitamin C, gotu kola, and flax oil directly target structural, scalp, and nutritional hair pathways. Evidence is strongest for vitamin C and mineral sufficiency, while horsetail, gotu kola, and oral flax oil have less direct hair-growth evidence.

Biotin, vitamin C, zinc, and horsetail extract are substantial, but 80 mg each of lysine and proline are below focused structural dosing. Zinc picolinate and chelated copper are useful, while horsetail lacks species and silica-yield details and the biotin isomer is not verified. The 2,600 mcg biotin serving can interfere with some laboratory tests, so users should tell the testing clinician before blood work.

Study evidence
Biotin Supportive 4 studies
Copper Adverse 4 studies
Horsetail Not classified

No linked studies yet.

Lysine Supportive 1 study
Vitamin C Mixed 5 studies
Zinc Supportive 22 studies

Ingredients

IngredientAmount per serving
Calories
20 Calorie(s)
Total Fat
1 Gram(s)
Protein
1 Gram(s)
Vitamin C (Calcium Ascorbate)
 200 mg
Biotin
2600 mcg
Calcium
30 mg
Zinc (Zinc Picolinate)
 10 mg
Copper (Copper Amino Acid Chelate)
 1 mg
Manganese (Manganese Citrate)
 5 mg
Flaxseed Oil
1058 mg
Gotu Kola extract (Triterpenes)
 180 mg
Horsetail extract (Silica)
 160 mg
Citrus extract (Bioflavonoids)
 100 mg
Lysine (Lysine Hydrochloride)
 80 mg
Proline
80 mg
BioPerine Complex
12 mg
Adults 18–50
Report overview
Copper (Copper Amino Acid Chelate) · 1 mg OverallScore84
A+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyD+ Value

The amino acid chelate provides a high-quality copper source with clear elemental disclosure. Its 1 mg amount supports maintenance, and the zinc-to-copper ratio is well balanced. Value is only average because the serving cost is above the collection median.

View ingredientView products
Manganese (Manganese Citrate) · 5 mg OverallScore82
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD+ Value

Manganese citrate provides a soluble organic form with good absorption potential at a 5 mg serving aligned with targeted support. The label clearly separates manganese from the rest of the formula, making intake easy to track. The above-median serving cost leaves value only moderate for manganese-focused use.

View ingredientView products
Biotin · 2600 mcg OverallScore78
B+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyC Value

The 2600 mcg biotin dose provides substantial potency but falls just below the strongest target range. The label lists biotin without verifying the biologically active d-isomer. Multiple active co-factors support a neutral value view despite a costly biotin-only calculation.

View ingredientView products
Loading alternative details
91 Performance

Vegan Hair Skin & Nails

NOW Solutions
<p>Chelated minerals, structural amino acids, hyaluronic acid, and antioxidant vitamins form a coherent hair, skin, and nail formula with strong serving value. High biotin and horsetail without silica standardization remain important limitations.</p>
86 Performance

Keratin Hair Booster

Reserveage Nutrition
<p>A meaningful keratin amount and high biotin directly target hair and nail structure more strongly than the original’s modest amino acids. Zinc oxide, copper sulfate, and a hidden longevity blend reduce form quality and value.</p>
75 Performance

Collagenics

Metagenics
<p>Vitamin C, minerals, proline, cystine, lysine, MSM, and a well-specified horsetail extract create broad collagen-oriented support. Most structural amino acids are modest, vitamin B6 is high for long-term use, and serving cost is premium.</p>
79 Budget

Silica Complex

NOW
<p>A substantial horsetail extract with calcium, zinc, manganese, and boron provides focused hair and nail support at a much lower serving cost. Missing horsetail species and silica yield limit confidence in its main active.</p>
82 Budget

Hair Skin & Nails

Nature Made
<p>Biotin, beta-carotene, vitamin C, zinc, and copper create a concise beauty formula at a much lower serving cost. Oxide minerals weaken absorption quality, and high biotin can interfere with laboratory tests.</p>
67 Budget

Mini-Multi

Carlson
<p>The one-daily formula offers broad vitamin coverage and excellent serving value. It is less hair-focused than the original, while calcium and magnesium are too small for meaningful structural support.</p>
84 Value

Longer Stronger Hair and Nails

Irwin Naturals
<p>Buffered vitamin C, useful mineral forms, biotin, horsetail, amino acids, and flax oil preserve the same targeted approach with slightly different package value. Lysine and proline remain modest, horsetail lacks full silica detail, and concentrated biotin can affect laboratory tests.</p>
71 Value

Hair Volume Gummies Apple Flavor

New Nordic
<p>Biotin, horsetail, apple, millet, and zinc provide convenient hair-focused support at similar or better serving economics. Zinc is token sized and the botanicals lack active-marker or silica standardization.</p>
65 Value

Mini-Multi

Carlson
<p>A broad one-daily vitamin profile offers excellent serving value and several useful forms. It lacks the original’s focused amino acids and horsetail, while calcium and magnesium remain too small for structural support.</p>
Report alternatives

Sources

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

  1. The Manganese-Bone Connection: Investigating the Role of Manganese in Bone Health.
    Taskozhina G; Batyrova G; Umarova G; Issanguzhina Z; Kereyeva N · Journal of clinical medicine · 2024
    Narrative reviewBone Health forManganese
  2. Relationship between blood manganese and bone mineral density and bone mineral content in adults: A population-based cross-sectional study.
    Wang C; Zhu Y; Long H; Ou M; Zhao S · PloS one · 2022
    Cross-sectional study9,732 participantsBone Health forManganese
  3. Correlation between bone mineral density and serum trace element contents of elderly males in Beijing urban area.
    Wang L; Yu H; Yang G; Zhang Y; Wang W; Su T; Ma W; Yang F; Chen L; He L; Ma Y; Zhang Y · International journal of clinical and experimental medicine · 2016
    Cross-sectional study91 participantsBone Health forManganese
  4. Associations of dietary copper intake with total bone mineral density and lumbar spine bone mineral density in American adults.
    Hu M; Wang Z; Li C; Zheng Y; Hu J · Medicine · 2025
    Cross-sectional studyBone Health forCopper
  5. The Association between Dietary and Circulating Copper Levels and Osteoporosis: a Scoping Review.
    Ju Y; Xiong W; Pang Y; Chen Z; Hou J; Zheng S; Li Z; Liu T; Xia H; Xia M; Zhong Y; Li J; Jiang X · Biological trace element research · 2026
    Scoping review18 studies pooledBone Health forCopper
  6. Serum copper levels are associated with bone mineral density and total fracture.
    Qu X; He Z; Qiao H; Zhai Z; Mao Z; Yu Z; Dai K · Journal of orthopaedic translation · 2022
    Cross-sectional study722 participantsBone Health forCopper
  7. 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
  8. 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
  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. 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
  11. 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
  12. 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
  13. 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
  14. Brittle nails: response to daily biotin supplementation.
    Hochman LG; Scher RK; Meyerson MS · Cutis · 1993
    Case series35 participantsNail Health forBiotin
  15. 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
  16. 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
  17. 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
  18. Causes of hair loss and the developments in hair rejuvenation.
    Rushton DH; Norris MJ; Dover R; Busuttil N · International journal of cosmetic science · 2010
    Narrative reviewHair Health forLysine
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. Vitamin C Deficiency in Inflammatory Bowel Disease: The Forgotten Micronutrient.
    Dunleavy KA; Ungaro RC; Manning L; Gold S; Novak J; Colombel JF · Crohn's & colitis 360 · 2023
    Other20 participantsNail Health forVitamin C