taking glutathione and nac together N-Acetyl-L-Cysteine Effect of N-Acetylcysteine on Sleep:

Avoid leaning your elbows at a desk or table

GHK-Cu is hydrophilic (water-loving), which limits its ability to penetrate the lipid-based skin barrier

doi: 10.1016/j.febslet.2006.02.031

And you may need to change your diet to limit the amount of copper you eat

This guide explains the general site-selection logic, why GHK-Cu is different from approved injectable drugs, and when to stop and get medical guidance

Copper toxicity Though its unlikely, copper peptide skin care products may lead to potential copper toxicity if not used as directed by the manufacturer (or if multiple copper-containing products are used together)