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Its unique chemical makeup is what allows it to slip through cell membranes and interact directly with the NNMT enzyme

Sun Exposure - Too much exposure to the UV rays causes darkening of lips if you don't follow sun protection or at least apply spf Biting of Lips - Constantly biting or licking lips can also cause discoloration and irritation

For step-by-step instructions, see the GHK-Cu Reconstitution Guide .

American journal of translational research 8 (5): 21692178

Consider Supplementation : If you're concerned about glutathione levels, consider looking into high-quality glutathione supplements or precursors like N-acetylcysteine (NAC)