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However, ZnO showed adverse effects, such as the accumulation of heavy metal in the environment, the risk for antimicrobial resistance (AMR), and problems of mineral toxicity and adverse growth effects when feeding it longer than 28 days (Jensen et al., 2018
Do not use in case of hypersensitivity to any of its components

doi: 10.1093/jnen/nly061

This is derived from a 15-question survey in which men rate their ability to attain and keep an erection, and to complete intercourse to their satisfaction

Here are the detailed recommendations based on clinical studies
