Hair
Nutrients connected to Hair
A link means the body needs the nutrient for this, or that low intake is linked to it. It does not mean extra supplements help if your intake is already adequate; each link shows how strong the evidence is.
- SeleniumDocumented risk
Hair loss is an early sign of too much selenium (selenosis).
- Poison fire coralDocumented risk
Hair loss was reported in several patients.
- Rosemary OilPreliminary or mixed
Hair count rose in a 6-month scalp trial.
- Hair, Skin and Nails FormulasDocumented risk
Too much selenium can cause hair loss; evidence for supplements helping hair without a deficiency is lacking.
- Vitamin B7Deficiency link
Hair loss is a sign of biotin deficiency. Evidence of benefit for healthy hair is insufficient.
- IronDeficiency link
Hair loss is listed by the NHS as a less common sign of iron deficiency anaemia. It does not show that extra iron helps hair when iron is adequate.
- ZincDeficiency link
Hair loss is listed as a sign of zinc deficiency, among many other possible causes.
- SpearmintPreliminary or mixed
Studied for excess hair growth (hirsutism) in women. Self-rated hirsutism improved in one trial, but the doctor-rated hair score did not.
- Lemongrass OilPreliminary or mixed
One 30-person trial of a lemongrass-oil hair tonic reported less dandruff over two weeks. It tested a made product.
- Cedarwood OilPreliminary or mixed
One 1998 trial of a four-oil scalp massage (including cedarwood) in alopecia areata; cedarwood alone not tested.
- Kukui Nut OilPreliminary or mixed
Eyelash length rose in a 4-week trial of 15 women; lab follicle and rat data only otherwise.
- Marine Collagen (Fish)Preliminary or mixed
One trial of fish-skin peptides reported a larger hair shaft diameter; evidence is limited.
Explore all vitamins → · Minerals → · Amino acids → · Omega fatty acids → · Antioxidants → · Gut supplements → · Nootropics → · Herbs →