All medications have side effects. Hives, constipation, dry mouth, and headaches are common side effects in a lot of drugs. But in some cases certain side effect combinations can indicate an allergic reaction instead of being a side effect. Be sure to read the specific warnings on the drug to be sure.
Overall, the entire suite of B-complex vitamins is essential for good hair and skin. In addition to Vitamin B12, vitamins B3 and B6 are also critical for hair and skin growth and appearance. A balanced B-complex vitamin supplement provides the extra boost your hair and skin may need to look great.
The following specific vitamins promote healthy hair: 1  Biotin promotes growth of existing hair, produces keratin, and works to increase hairâs elasticity. 2  Niacin (Vitamin B3) promotes blood circulation to the scalp.  Pantothenic Acid (Vitamin B5) strengthens and nourishes the hair follicle.