#short-peptides
4 pieces tagged short-peptides.
- The moleculesSemax and Selank: two heptapeptides and their US statusSemax (MEHFPGP) is four residues of ACTH plus a Pro-Gly-Pro tail; Selank (TKPRPGP) is the tetrapeptide tuftsin plus the same tail. Where each came from, what the spelling variants mean, and their status as of September 2026.
- How it is madeWhy a factory-made peptide spray differs from a vialWhat a formulated aqueous peptide product contains (buffer, tonicity agent, preservative), how preservative efficacy is tested under USP <51>, why formulated products carry an in-use period, and what a dissolving strip is made of.
- The moleculesHow to read a peptide sequenceThe one- and three-letter codes, which end is which, what Ac- and -NH2 mean, how D-residues, rings and lipids are written, and four worked examples from the catalog.
- The moleculesGHK-Cu: why the powder is blue and what copper peptide meansGHK-Cu is the tripeptide glycyl-histidyl-lysine holding one copper(II) ion. The copper is what makes it blue, what makes it a different molecule from GHK, and what its two INCI names are about. Status as of September 2026.
Nothing here is medical advice. Everything on this site is supplied for laboratory research use only.