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According to the same PMC/NIH review, topical GHK-Cu applied to thigh skin over 12 weeks improved collagen production in 70% of participants, compared with 50% for a vitamin C cream and 40% for retinoic acid in the same study a comparison that helped cement GHK-Cus reputation as a serious subject of dermatological research
Phoenix Meds Inc
PMC 2820578
Pros & Cons What I like about it: The Paula's Choice 25% Vitamin C + Glutathione Clinical Serum is one of the best Vitamin C serums with a very high concentration of Vitamin C
US$ 23.57
US$ 20.06
US$ 27.17
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