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This is not a question of which ingredient is "stronger." It is a question of whether your skin responds better to being forced into repair or signaled into it
At the same time, important questions remain, particularly regarding long-term use in larger and more diverse patient populations
Tips Before Getting B12 Injections Get Your B12 Levels Checked First Before jumping in, ask your doctor for a simple blood test
Last reviewed: July 16, 2026 Last updated: July 16, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
Topical GHK-Cu, Serums, Eye Creams, and Injectable GHK-Cu Topical GHK-Cu appears in published skin-care studies, wound-healing research, and clinical-trial protocols, while injectable GHK-Cu is treated differently by FDA compounding-risk materials [2], [7], [8]
Individual tolerance varies some may gradually increase to 500750 mcg/day, but caution is advised
