True Cellular Formulas Zinc7 is special in that it has seven forms of bioavailable zinc: zinc citrate, zinc gluconate, zinc acetate, and more. Each one is tailored to address a particular physiological need so that each will be absorbed maximally and be the most effective. True Cellular Formulas Zinc7 also includes cofactors such as vitamin C and amino acids, which further enhance zinc bioavailability and cellular uptake. This supplement would be just right for people looking for a good, trustworthy zinc supplement to help the immune system, energy, and vigor.