At present, peptides that have advanced to Phase I clinical trials, such as acetyl tetrapeptide-3, GHK, and GPIGS, are delivered topically in lotions or creams [18,25,119]
The cited half-life range comes from pharmacokinetic studies in animal models and is consistent with the general behavior of unmodified small peptides in blood
Originally developed as a tanning agent (acting via MC1R receptors), it also binds to melanocortin receptors in the brain (particularly MC3R and MC4R) that influence sexual function
Precision and safety are paramount
Many people report feeling a noticeable lift in their energy and mental clarity within the first 24 to 72 hours
In contrast, potential perioperative relevance may relate to metabolic instability, including glycemic effects, fluid retention, and blood pressure variability, particularly in older or comorbid surgical populations