glutathione is used for skin whitening Topical vs Oral Glutathione: Which Better Skin? Glutathione for skin lightening -
Description
It works by neutralizing free radicals, detoxifying the body, and reducing melanin production to lighten the skin

It has a high affinity for copper ions (Cu), forming a stable and biologically active complex that may support coppers bioavailability and intracellular activity

[DOI] [PMC free article] [PubMed] [Google Scholar] Hassan MQ, Hadi RA, Al-Rawi ZS, Padron VA, Stohs SJ
a lot of the strongest data is on the full extract or a Madecassoside/Asiaticoside rather than Madecassic Acid alone
