Is N-acetyl cysteine actually better than takin Glutathione supplements?

I don't want to be "white" I just want to even and brighten my skin tone. I have tried L-glutathione but the guy at the health food store said N-acetyl cysteine would actually be better for raising my glutathione levels....because it stays in the body longer....I even heard just Vit. C alone will brighten and even skin tone??? So who wants the best answer from me?
 
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