Everyone knows a balance of vitamins and minerals helps keep mind and body in good condition. A deficiency in a certain vitamin or mineral can produce varying symptoms in the body. One of the most visible signs of a zinc deficiency, for example, is hair loss. There is an association between a deficiency in B vitamins and hair loss as well. Moreover, if you’re deficient in iron, you may experience telogen effluvium, which leads to thinning hair across the scalp.