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2014;37:e76e77
A 12-week study on 71 women using GHK-Cu cream showed progressive improvement in collagen, with 70% of participants responding positively compared to 50% with vitamin C and 40% with retinoic acid (Pickart et al., 2015)
Evidence-Based Supplements for the Enhancement of Athletic Performance
Itoh, K
Guidelines For Clinical Practice Glutathione is primarily produced in the liver, with smaller amounts synthesized in other cells throughout the body
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