which vitamins shouldn't you take together
In terms of meeting basic nutritional needs, taking a multivitamin that includes niacin, or vitamin B-3, is safe in combination with other nutrients. However, if you take niacin supplements to help control your cholesterol, certain combinations should be avoided. Vitamin A as beta-carotene, and vitamins C and E may reduce niacin's ability to improve good cholesterol levels, according to MedlinePlus.