Clinical Cellular CareEssential to Growth, Reproduction, Immunity, and Skeletal HealthZnGluten FreeNon-GMOSoy FreeDietary SupplementLook What's Inside - No Proprietary Blends | Full Disclosure LabelingMade in the USA since 1992The Krebs cycle generates energy in every cell. Zinc bound to the five organic acids that drive the cycle is thought to be highly bioavailable because the acids are needed to support energy production and life itself.