Healthy hair depends on eating foods high in protein and certain vitamins and minerals. Inadequate protein intake over a lengthy period can force hair into the resting phase with shedding a few months later. Five amino acids are of particular relevance to hair growth - cystine, cysteine, methionine, arginine and lysine.

There a number of different specific hair vitamins and minerals that can play a major role in helping a person have a healthy head of hair. Vitamins necessary for healthy hair include vitamins A, B6, biotin, inositol, and folic acid. Minerals needed to good hair growth are magnesium, sulphur, silica and zinc.

Extra hair vitamins are likely to be needed if a person is generally unwell or is undernourished as their hair will show damage and may even stop growing. For example, brittle hair is an indication of iron deficiency while prolonged and severe hair loss can mean inefficient functioning of the liver or the thyroid.

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