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They act as signalling molecules that send messages between cells and tissues to perform specific biological functions such as hormone release, tissue repair, fat metabolism, and muscle growth

Earlier signs may include reduced shedding or improved scalp feel, with visible density changes taking longer

In a randomized, double-blind, placebo-controlled trial in 2,919 participants (65 years) with elevated blood concentrations of homocysteine, supplementation with vitamin B 12 (500 g/day) and folic acid (400 g/day) for two years did not decrease the risk of osteoporotic fracture despite reductions in homocysteine (120, 121)

A deficiency can cause tingling, numbness, and balance problems