The Beauty IV includes both at high concentrations
Age-Related Decline In the body, GHK-Cu naturally occurs at concentrations of approximately 200 ng/mL in plasma at age 20, but these levels decline progressively with age to less than 80 ng/mL by age 60 - this age-related decline correlates with decreased tissue repair capacity, skin aging, and impaired regenerative responses, leading to the hypothesis that GHK-Cu decline contributes to aging phenotypes and that restoration of youthful levels through supplementation could have anti-aging benefits
Levels of GHK-Cu in the body naturally decline during aging [2]
Liposomal glutathione may be reasonable for someone who prefers direct glutathione delivery through a phospholipid formulation and tolerates its taste, texture, storage requirements and cost
thaliana to exogenous SA treatment and to a Pst DC3000 strain harboring the effector gene AvrRpm1
Overall, this is a well-tolerated ingredient that works well in formulas designed for sensitive, reactive, or post-procedure skin