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.
Vitamin A. Vitamin A will help your hair and skin health. This antioxidant vitamin helps normalize cell growth, maintain healthy skin, form collagen and increase your cell renewal rate, according to the National Institutes of Health.
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.