dihexa synaptogenic effects (also known as PNB-0408) is an experimental small molecule derived from angiotensin IV. It was engineered to cross the blood–brain barrier and has shown in preclinical models. The often-quoted Dihexa Peptide Therapy | Memory

A young adult in their 20s may have roughly 200 ng/ml of GHK circulating in plasma, while someone in their 60s may have closer to 80 ng/ml

If you want a nasal spray option, Behemoth Labz has a solid product

Evidence for a role of delta sleep-inducing peptide in slow-wave sleep and sleep-related growth hormone release in the rat

The peptide is being developed for topical application, and one additional benefit is that as a small protein, it will be safely broken down into naturally occurring amino acids after exerting its therapeutic effects

Nikiforos Alygizakis, Environmental Institute, s.r.o., Slovakia Updates Copyright 2022 Basiry, Entezari Heravi, Uluseker, Kaster, Kommedal and Pala-Ozkok

J Physiol Pharmacol 2009;60:17781.PubMed 20