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.
2. Vitamin C  It is an antioxidant that helps maintain skin & hair health. Food sources: Citrus fruits, strawberries, kiwi, cantaloupe, pineapple, tomatoes, green peppers, potatoes and dark green vegetables. Daily Dose: 60 mg.