The Short Version
Zinc supplementation can raise testosterone — but primarily in men who are already zinc-deficient, not men generally. The claim's universal framing omits this critical qualifier, which is consistently emphasized across the strongest peer-reviewed evidence, including a 2022 systematic review of 38 studies. The "sexual performance" sub-claim relies almost entirely on animal studies involving lead-exposed rats, with no robust human clinical trial demonstrating this benefit in typical men. A large multicenter human RCT found no reproductive improvement and even documented harm from zinc supplementation.