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FDA panel, with ties to the peptide industry, recommends easing restrictions on four of the compounds

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All products are sold in powder (lyophilized) form and require reconstitution with a suitable diluent for research purposes only

A 45-year-old with low testosterone and normal FSH may respond to peptides that support Leydig cell function, while a 40-year-old with high FSH suggests testicular failure where different tactics are needed

In clinical and cosmetic literature, this distinction matters because a topical serum, wound gel, liposomal formula, and injectable preparation may have very different safety and absorption profiles