Melanotan 1 and Melanotan 2 are not the mild and strong versions of one tanning peptide. They are different molecules with different receptor profiles, and
Vasoactive intestinal peptide has a plasma half-life of about two minutes. That one number determines nearly everything about how it can be studied, and why
Search for anti-inflammatory peptides and you get BPC-157, over and over. It has a large rodent literature and no completed controlled human trial. Meanwhile a
Semax and Selank get discussed together constantly, usually as two flavours of the same Russian nootropic idea. They are more closely related than most comparisons