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Vitamin B12 for hair is particularly important, as your hair follicles depend on the above processes to function properly and sustain healthy hair growth

The answer to this question may not be as straightforward as it seems

Strict vegetarians and women planning to become pregnant should take a multivitamin supplement daily or eat fortified cereal, which would ensure a daily intake of 6 to 30 g of vitamin B 12 in a form that is easily absorbed

If your times are entered in hours, the doubling time will be in hours

Age affects both absorption and utilisation of B12, with older adults often experiencing slower responses