Activate Your Immunity Zinc plays an active role in a number of biological functions, from protein synthesis to cell division. It also has a key job in healthy immune function. KAL Zinc 30 Orotate Sustained Release tablet contains 30 mg zinc to support healthy immune function. Our formula uses chelated zinc orotate, which is designed to be a highly bioavailable form of the mineral. Our sustained release tablets can allow more time for your body to absorb the zinc and be easier to digest.