"Testosterone supplementation and body composition: results from a meta-analysis of observational studies." J Endocrinol Invest
FDA evaluates a nominated substance using a balancing test that includes characterization, safety issues, available evidence of effectiveness or lack of effectiveness, and historical use
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References: [1]Li, Kaixuan
Unlike peptides that require brain penetration, klotho enhances cognition when administered peripherallydespite not crossing the blood-brain barriersuggesting it acts through systemic signaling mechanisms that remain incompletely understood