No head-to-head trial has compared them, so better cannot be answered directly
Brightens Skin and Reduces Hyperpigmentation GHK-Cu reduces excessive melanin production by modulating melanocyte activity, helping to: Fade dark spots Lighten age-related pigmentation Promote a more even skin tone GHK-Cu treatment led to reduced pigmentation and improved brightness in clinical studies. Shim et al., Cosmetics 3
Step 3: Timing
Subsequently, they received intravenous injections of PBS, Ru(II)-OH, NP2, or NP4 (at a dosage of 2 mg/kg Ru) on days 0, 3, 6, and 9, respectively
Hepatocyte growth factor gene therapy of liver cirrhosis in rats
While the precise regulatory pathways continue to be studied, findings suggest that glutathione plays a foundational role in supporting biological processes related to cognitive resilience, metabolic balance, and long-term cellular health