Timing depends on your goals
We think we know a cat when we see one
Your skin will thank you for it
Moreover, it could have conceivably decreased the manifestation of urea cycle enzymes, reinstated nitrogen equilibrium, and theoretically adjusted or enhanced the nitrogen values in organs
Skin Health, Skin Elasticity, and Aging Skin Concerns A review of topical anti-aging peptide studies reported that Cu-GHK formulations were associated with improved visible signs of aged and sun-damaged skin, including skin density, thickness, elasticity, humidity, and wrinkle appearance in 12-week studies involving 71 or 41 women [2]
How will benefit be measured before deciding to repeat treatment