glutathione is for skin whitening The Science Behind Topical Brightening – Chicnutrix ALMOES L-Glutathione skin Whitening Serum
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And if you want to take it to a whole new level then you could also consider glutathione injection

A B12 injection bypasses the digestive tract, ensuring direct absorption into the bloodstream

When used appropriately and under the guidance of a dermatologist, this agent can be both safe and effective," he explained

This is a relatively shallow injection and is relatively painless, using a very small needle

[DOI] [PubMed] [Google Scholar] 138.Gallogly M.M., Starke D.W., Mieyal J.J