But natural remedies are not always the best way to treat a problem. You won't need to supplement your diet if you eat a better diet. But if you do want to take a dietary supplement, consult a doctor or pharmacist, Dalbow said. Not knowing the effects of an herb, vitamin or mineral and how it can react to other medication and foods can be dangerous. Larger amounts of this type of Vitamin A can harm the liver over time.
Vitamin D can be harmful in large amounts.
Adults should take no more than 2000 International Units per day, unless prescribed by a physician. The recommended daily allowance for adults is 200 to 400 international units, an amount often found in multi-vitamin supplements and some calcium supplements. If you do not have 2-4 servings per day of dairy products you might need supplements for calcium, but never exceed 2500 milligrams per day. Ask your doctor or dietician how much you should have. Because multi-vitamins and mineral supplements do not provide large amounts of calcium, you might have to take a calcium supplement as well.