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The three proline residues at positions 35 (the PPP motif) rigidify the chain and hinder access by proteolytic enzymes a molecular explanation of the peptide stability in the gastrointestinal environment described in the literature

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Types of Peptides Different peptides serve different purposes: Growth hormone secretagogues stimulate natural growth hormone production (e.g., CJC-1295, Ipamorelin)

Approximately five of the original 19 peptides are expected to remain on the restricted list likely those with more limited safety profiles, higher misuse potential, or closer proximity to existing FDA-approved drug categories