Might biotin or zinc supplements prevent hair loss in men and women? By the time we’re 50, about half of us, men and women, will experience hair loss. No, it’s not caused by washing your hair too much or, for that matter, brushing it too much either—two of the many myths out there. Researchers found that the majority of hair loss with age is genetic for both women and men. And, based on studying twins, researchers discovered that the heritability of baldness in men is 79%, meaning about 80% of the differences in hair loss between men are genetically determined. But that still leaves some wiggl...