which glutathione is good for skin whitening the Glutathione Injections For Skin Whitening:

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Structure of oxidized GPX4 U46C-K48L is modeled based on oxidized GPX4 U46C-K48L crystal structure reported in this work

A meta-analysis of 26 RCTs (n=3,864) found that NAC (typically 600 mg twice daily) reduced the incidence of contrast-induced nephropathy by 40% (OR 0.60, 95% CI 0.44-0.81) (Gonzales et al., BMC Med, 2007) [67]

Those in the latter camp should know that the taste does linger a bit, so if that's a dealbreaker, one of the capsule supplements may be more to their preference

Formulated with 1,000,000 ppm of 100% vegan glutathione, this single ingredient film provides benefits without synthetic additives

If you want a broader overview of the ingredient itself, Cymbiotikas guide to What Is in Glutathione is a helpful place to start