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Hair & Nails

The strength, thickness and appearance of hair and nails. It is measured by hair and nail growth rate, by breakage, by strand thickness and by rated appearance.

25 supplements analyzed and ranked by clinical evidence.

Supplements25

Supplement Evidence

Iron
Strong

Anemia/ferritin +Hb

Iron stores +Hb

3022 studies·16 benefits
Zinc
Moderate

Dandruff/hair conditioning +1

Hair loss/zinc status

1804 studies·17 benefits
Whey Protein
Moderate

Acne: lesions -38.6%

Psoriasis/Eczema: improved scores

662 studies·17 benefits
Boron
Moderate

Nail clearance +13-30%

Mycology negative, irritation

180 studies·8 benefits
Silica
Moderate

Hair strength/thickness improved

Nail brittleness reduced

Skin roughness lowered

796 studies·15 benefits
Tea Tree Oil
Moderate

Nail cure 80%

Low culture cure 18%

47 studies·9 benefits
Pantothenic Acid
Moderate

Hair thickness/density improved

Hair fall ↓, density ↑

71 studies·11 benefits
Biotin
Weak

Hair shedding↓

Hoof growth +15%

Nail severity↓62%

Hair growth +11.9%

Nail severity -57%

73 studies·14 benefits
Lysine
Weak

Nail cure +82%

Plasma/nail levels 10-35x

Extra cure 73.3%

368 studies·18 benefits
Inositol
Weak

Hair growth/androgens improved

-1.4 nmol/L

270 studies·17 benefits
Omega-3 Fatty Acids
Weak

Less hair shedding

Hair density up

2885 studies·19 benefits
Alanine
Weak

Wound infections, shorter stay

Hair density, less shedding

3028 studies·18 benefits
Rosemary
Weak

Hair growth + itching

Antioxidant scalp protection

77 studies·15 benefits
Chromium
Weak

Hair: hirsutism -1.8

Nails: none

434 studies·11 benefits
Vitamin C
Weak

Hair improvement +12.5%

Patient-rated improvement +16%

1513 studies·18 benefits
Vitamin B9
Weak

Hemoglobin ↑

Memory/attention ↑

2758 studies·14 benefits
Fish Oil
Weak

Hair density ↑, shedding ↓

Hair diameter ↑

2905 studies·20 benefits
Iodine
Weak

Paronychia severity -15%

Pain/QoL improved

1602 studies·17 benefits
Hyaluronic Acid
Weak

Hair density +91/ncm²

Wrinkle depth, evenness

1318 studies·13 benefits
Collagen
Weak

Hair growth +1.01

Tolerability unchanged

2951 studies·14 benefits
Essential Amino Acids
Weak

Hair growth +1.01

Good tolerability

2629 studies·19 benefits
L-Methionine
Weak

Hair outcomes +1.01

Wool traits, methionine

343 studies·17 benefits
Fo-Ti
Weak

Melanin ↑36.9%

TYR/α-MSH ↑

2 studies·2 benefits
Vitamin E
Weak

Lice cure +34%

Reinfestation reduction

1815 studies·17 benefits
Selenium
Weak

Cure rates +90.9%

Well tolerated

696 studies·17 benefits