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      learn Neem Oil

      Oil from the neem tree, used as a pesticide and in traditional remedies. Human evidence for hair or scalp benefits is limited; it can cause skin allergy and is poisonous if swallowed.

      learn Vitamin D

      Low vitamin D is linked with some types of hair loss, especially alopecia areata, but there is no good evidence that supplements help hair unless you are deficient. Ask a doctor about a blood test before you supplement.

      learn Hair Transplant

      • Is a hair transplant safe? Serious complications are uncommon in published case series, but every transplant carries risks, including infection, folliculitis, numbness, scarring, poor growth and, rarely, skin necrosis. Risk depends on the surgeon and on who actually performs the surgery.
      • What is the success rate of hair transplants? Clinics report high graft survival, but there is no independent overall success rate and results vary.

      learn Biotin

      A B-vitamin often sold for hair; a 2017 review found benefit reported only in people with an underlying deficiency or condition. The FDA warns that high doses can make some blood tests wrong.

      learn Castor oil

      A plant oil used in cosmetics and traditional medicine. It is popular in hair care, but no controlled human trial has tested it as a hair-growth treatment.

      learn Minoxidil

      A vasodilator used on the scalp (over the counter) and, off-label, as a low-dose prescription tablet for pattern hair loss.