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It's been cited by podcaster Joe Rogan who says it helped him treat a muscle injury

FDA approval normally follows a formal application supported by adequate evidence for a defined product, dose, route, patient population, manufacturing process, labeling, effectiveness, and safety profile

This isn't merely a formality

It increases energy levels and concentration, may improve metabolism, boosts the immune system, and aids in restful sleep

+ A B12 injection delivers a measured dose of vitamin B12, in the form of cyanocobalamin, directly into the muscle, usually the upper outer arm

For the broader population of healthy adult researchers, GHK-Cus side effect profile makes it one of the more forgiving compounds in the regenerative peptide category