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L-Glutathione is a naturally occurring antioxidant compound studied for its role in oxidative stress balance, cellular detoxification pathways, and overall cellular health in clinical research

The recommendation is to establish and optimize the cagrilintide-retatrutide combination first before considering any additional peptides

That outcome would move GHK-Cu off Category 1, likely toward Category 2 or the do-not-compound list

J Food Compos Anal 64:3942

They work best when combined with therapy or counseling, and should always be taken under medical supervision to ensure safety and effectiveness