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In fact, it is the most popular and widely used skin lightening agent in Japan

The same body of research also found that higher doses of GHK-Cu can produce skin irritation, and that copper in general is highly toxic, which is why formulation and concentration matter considerably in any experimental design involving this compound

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A qualified healthcare provider should evaluate your personal health history, current medications, and oxidative stress biomarkers to determine whether oral glutathione capsules represent an appropriate first-line approach or whether alternative delivery routes or complementary strategies better serve your wellness goals

Therefore, avoid self-medication to minimize the risk of unwanted side effects