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.
1 Free radical damage can cause hair aging, and vitamin C can help protect the scalp and fair follicles from this major hair growth inhibitor.  Biotin and pantothenic acid (vitamin B5) have been used as alternative treatments for hair loss. Biotin rebuilds hair shingles, and vitamin B5 supports the adrenal glands.