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Yes, GHK-Cu can be photosensitive, meaning light exposure can contribute to its degradation
The what happens when you stop GHK-Cu article discusses how results change with discontinuation and can inform decisions about ongoing use versus cycling
Further investigation showed that CPs first reduce the level of skin oxidation, inhibit the expression of the key transcription factor AP-1 (c-Jun and c-Fos), then activate the TGF-/Smad signaling pathway to promote collagen synthesis, inhibit the expression of MMP-1/3 to inhibit collagen degradation, and inhibit skin inflammation to alleviate skin aging in mice
Bibcode:2015PLoSO..1035268K
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