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The Evidence Gap: Clinical Trials and What They Actually Show The evidence gap between GHK-Cu and retinoids is real, and any honest comparison of GHK-Cu vs retinol for anti-aging must address it plainly
Genomic Research Campbell et al
Common Side Effects Experienced by some users Facial flushing Your face may turn red and feel warm shortly after injection
When levels are low, oxidative damage can build up over time, and that can lead to muscle soreness, joint pain, or symptoms that mimic autoimmune flare-ups
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