Peptide Dosage and Administration Guide PDF Injection (Medicine) Drugs FDA Peptide Update What You Need to Know Big shift this week. The FDA is actively updating its peptide policy, with multiple compounds moving out of Category 2 and into formal Double blind, placebo controlled evaluation of the safety, pharmacokinetic properties and pharmacodynamic effects of intranasal PT 141, a melanocortin receptor agonist, in healthy males and patients with mild to moderate erectile dysfunction Melanotan 2 Dosage: How to Use Melanotan Peptides Safely