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They dont do anything about the underlying pigmentation, the accumulated sun damage, or the dullness that builds up over time

10.1124/JPET.106.110866 87 JingX.ShiH.ZhangC.RenM.HanM.WeiX.et al (2015)

Clinical Status: BPC-157 is a research peptide evaluated in numerous animal models and limited human observational studies for gastrointestinal healing, musculoskeletal regeneration, and angiogenic modulation

Several factors can reduce glutathione levels in the body, including: Chronic stress Poor nutrition Smoking Excessive alcohol consumption Lack of sleep Environmental pollution Aging Certain medical conditions Managing these factors may help support healthy glutathione levels over time

European Neurology, 27 (2), 120129.

Is Glutathione Good for Skin Whitening