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GHK-Cu is detectable in urine for approximately 1218 hours post-administration using LC-MS (liquid chromatography-mass spectrometry) methods that specifically target the intact tripeptide or its primary metabolites

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[1] The research, published in a peer-reviewed journal, shows that paraxanthine not only enhanced memory and cognitive function more effectively than caffeine, but also triggered beneficial changes in key brain chemicals and markers of neuroplasticity