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 C. Vitamin C is good for your hair growth and healthy skin. Vitamin C may help your skin look younger, according to the Mayo Clinic. Vitamin C plays an essential role in forming collagen. Collagen, a protein, stimulates skin production, 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.