Deng, Z.-Y., Shan, W.-G., Wang, S.-F., Hu, M.-M., & Chen, Y
Niacinamide balances skin tone by preventing the transfer of pigment, which helps reduce dark spots
When this pattern is observed consistently across multiple injections, copper sensitivity is the first thing evaluated and the primary reason protocols are adjusted or discontinued
[Abstract] Cell Rep
Expression of both GSH1 and GSH2 is relatively ubiquitous in plant tissues but is upregulated at the transcriptional level by biotic stresses and methyl jasmonate [97], as well as abiotic stresses such as high light [9] and heavy metals [75,76], but not by H 2 O 2 or oxidative agents [75]
Hormonal changes, stress, dietary shifts, or new products introduced around the same time as GHK-CU could be responsible