In your skin, NAD helps repair cell damage, produce new healthy cells, support collagen production, strengthen the skin barrier, and fight environmental stressors (like UV and pollution)
This is called the gate control theory of pain, and it has solid scientific backing
Appl Sci 13:9342
The practical reason to stop is that you want a clean off-period to re-measure fasting glucose, A1c, lipids, and body composition, and see whether the peptide actually changed anything
When administered in this manner, GHK-Cu appears to be non-toxic and non-irritating with no adverse effects [2]
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