Most are not FDA-approved for human use, some exist only through a prescription or compounding pharmacy tied to a different condition, and the rest are sold exclusively as unregulated "research chemicals" not intended for human consumption
In the mixed urine samples collected from 0 to 8 h, the content of [ 3 H]proline (M1), the main metabolite, was higher, accounting for 13.9% (female) and 11.7% (male) of the total radioactivity
Endocrinology & Metabolism, 140(12), 5616-5621
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Search pages aimed at the Peptides UK market may place the compound beside GLP-1 analogues, mitochondrial peptides, growth-hormone-related substances and peptide blends