Basic Preventive 4, provided by Douglas Laboratories, is a comprehensive, highly concentrated vitamin-mineral-trace element supplement containing more than 30 essential nutritional ingredients. Basic Preventive 4 is more than just another multivitamin supplement. It is a potent antioxidant formula with natural beta-carotene (from D. salina) and natural vitamin E; a high-potency B-complex supplement; a significant source of bioavailable calcium and magnesium; and a full-spectrum trace element supplement. Basic Preventive 4 uses only the purest, most hypoallergenic ingredients and contains no yeast; corn; wheat; sugar or other sweeteners; artificial colors, flavors or preservatives. This formula is copper & iron free.