For optimal assimilation and pH balance, this formulation uses zinc citrate, the natural form of zinc that is found in human milk. Vitamin B6 and ascorbic acid have also been added to facilitate zinc metabolism. Zinc is an essential mineral that activates more than 70 enzymes, including those that assist with protein synthesis and tissue repair.* Hypoallergenic* product free of the following common allergens: milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, yeast, and soybeans. Contains no artificial colors, flavors, or preservatives. Trusted by healthcare practitioners since 1969, Klaire Labs products are developed closely with physicians and are intended to be used as directed by a healthcare practitioner.