What is more effective as regards lightening the melanin of the skin? L-gluthathione or vitamin C? why?

I know that vitamin c converts the brown melanin into lighter melanin but what is the difference with the amino acid L-gluthathione as regards lightening the melanin of the skin?





Besides, I know there are acid kojic creams,cucumber creams,lemon creams ,orange creams ,grape creams,sake or liquorice creamsin order to clarify the dark complexion(cosmetics things). what do you know as regars food which reduce the production of melanin apart from vitamin c ?

What is more effective as regards lightening the melanin of the skin? L-gluthathione or vitamin C? why?
L-gluthathione