nac and glutathione supplements together Designs for Health - 900mg N-Acetyl-L-Cysteine, Antioxidant Precursor - Detox + Workout Recovery Support Pure Encapsulations NAC + Glycine
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The paper proposed that GHK works partly by helping copper get into cells - the idea behind studying the copper-bound form, GHK-Cu, rather than the peptide alone

[DOI] [PubMed] [Google Scholar] 79.Wilhelm J., Mller A., Gruner-Labitzke K., Lichtinghagen R., Hillemacher T., Bleich S., Frieling H., Khler H

10.1016/j.theriogenology.2019.01.016 45

Furthermore, Vitamin C is also a tyrosinase inhibitor, meaning it supports the same skin-brightening pathways as glutathione
