bpc 157 andrew huberman Does oral work The Truth About Peptide Injections:

Many clinics use pre mixed or mass- produced formulations that can lose potency, contain unnecessary fillers, or fail to meet medical grade standards

It contains no dissolved substances (such as salts, antimicrobial agents, or preservatives) and is intended to be used as a solvent or diluent for medications that will be given by injection Sterile Water for Injection USP is a single-use, purified, apyrogenic solution trusted by hospitals, pharmacies, clinics, compounding facilities, and healthcare professionals worldwide

There is anecdotal but not clinical evidence for this

Endothelial nitric oxide is also involved in cognitive function and protection against neurodegenerative diseases