For skin specifically, glutathione works on multiple levels
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The lethal dose threshold (LD1) was never achieved in animal safety studies meaning researchers could not identify a dose lethal to 1% of test subjects
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Barthel A, Okino ST, Liao J, Nakatani K, Li J, Whitlock JP Jr, Roth RA
While complete elimination of mature stretch marks is unlikely with any non-surgical treatment, GHK-Cu can visibly improve their appearance and texture over several cycles, particularly when combined with consistent topical application to the affected areas