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How much glutathione and vitamin C to take for skin whitening? 

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In conclusion, orally administered vitamin C increases the radical-scavenging activity of the skin.
Considering the vitamin C stability, the SMB and the GLT showed to be statistically adequate, as antioxidants, for the cosmetic formulations.
Highest-evidence literatures showed that glutathione is not beneficial enough as a skin-whitening agent as it was only effective in some parts of the body and did not elicit long-lasting effects.
We have found 9 herb extracts to be promising skin whitening agents.
These results suggest that glyasperin C and glycyrrhisoflavone could be promising candidates in the design of skin-whitening agents.
Currently, there are three randomized controlled trials that support the skin-lightening effect and good safety profile of topical and oral glutathione.
These results demonstrate a role for vitamin C and vitamin E in maintaining glutathione in its reduced form.

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