glutathione skin pigmentation evidence is proven to be effective in reducing pigmentation, tanning, brightening the and glowing the skin. I took 6 sessions of glutathione with vitamin C, b complex and NAC and these are the PDF) Glutathione for skin lightening:
Description
Arch Biochem Biophys 464:5769

Plant-based natural products have naturally occurring antioxidants such as glutathione, which have been shown to prevent damage to skin cells
Abbreviation: SD, standard deviation

M., & Morrison, S

Nanoparticulate cellular patches for cell-mediated tumoritropic delivery

A variety of garlic-derived organosulfur compounds have been found to inhibit platelet aggregation in the test tube (42-44)
