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There is no published guideline for when to stop GHK-Cu
Excessive skin lightening: In some cases, glutathione may lighten skin more than intended - particularly with aggressive or prolonged dosing beyond what was planned
However, other treatment options such as laser skin resurfacing, intense pulsed light (IPL), or chemical peels can have unpleasant side effects
The main risk associated with GHK-Cu in clinical practice is sourcing quality, unregulated compounding pharmacies or unverified online vendors may produce peptide preparations with impurities that cause reactions incorrectly attributed to the peptide itself
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