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Published clinical trials report a favorable safety profile for GHK-Cu with low rates of mild observations including localized application site irritation (5%), transient skin redness (3%), and itching (2%)
No human trial proves a universal best time for GHK-Cu
Red Flags Requiring Immediate Attention Severe allergic reactions are extremely rare but possible
Purification and characterization of glutathione S-transferases from the bovine cornea [PMID: 7117420] Laboratory literature summary: Purification and characterization of glutathione S-transferases from the bovine cornea
As with any supplement, be aware of potential glutathione side effects and consult with a healthcare professional
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