Concurrently, retinoic acid (6 mg/kg) administration reduced repetitive behaviors in the self-grooming test, as evidenced by a consistently observed decrease in self-grooming duration, a hallmark of stereotyped behavior [90]
Bowers CY, Granda R, Mohan S, Kuipers J, Baylink D, Veldhuis JD
Additionally, NAC infusion also resulted in increased total and reduced NAC levels in skeletal muscle at 45 minutes of exercise and at fatigue
The responsible takeaway is that topical GHK-Cu has a reassuring but not exhaustively proven safety record, while systemic use is genuinely under-studied in humans
Injections are more effective for those with absorption issues or severe deficiencies, while pills may suffice for mild deficiencies