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In fact, many people find that taking them together simplifies their morning routine and provides a dual-layered approach to wellness
Imai et al
This article is for general information only and is not personal medical advice

The reason is because you need B12 to effectively produce cystathionine, which then forms cysteine, which then goes on to form glutathione

Foroutan M, Cursons J, Hediyeh-Zadeh S, Thompson EW, Davis MJ