To understand the relationship between sleep and glutathione, you first need to understand oxidative stress
What they did: Maquart and colleagues studied the effect of GHK-Cu on skin fibroblasts in cell cultures (in vitro)
, 109 , 354-362, doi: Zhang, B., Li, Y., Hou, D., Shi, Q., Yang, S., and Li, Q
Interestingly, when we went through the process and indicated that our main concern is dark spots, that were as healthy as a horse, but that weve never used hydroquinone before, it actually recommended an entirely different product called Future Formula RX, which contains tretinoin (a prescription-level version of retinol), azelaic acid, tranexamic acid, niacinamide, and dexpanthenolbut no hydroquinone
Its purpose is to ensure more of the intact peptide reaches its target