What is phenylketonurics and what is phenylalanine?
Phenylketonurics is the term used to refer to people that have the metabolic disorder, Phenylketonuria (PKU). Individuals with PKU have a deficiency of an enzyme, which is necessary to effectively metabolize the amino acid called phenylalanine. Aspartame is used as a sweetener in Vitamax® multivitamins. The Food and Drug Administration (FDA) has ruled that all products containing aspartame must have a warning for individuals with PKU.