Multi-Vi-Min® was formulated by Stephen A. Levine, Ph.D. to be hypoallergenic, and many people who cannot tolerate a complex nutrient formula do well with the Multi-Vi-Min formulas. The formula utilizes the purest USP grade materials, which are ultimately synthesized from naturally occurring sources. Vitamins B2 and B6 are supplied partially in their coenzyme forms. Vitamin C was purposely left out because of its ability to enhance iron absorption.