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This can lead to a B12 deficiency over time

10.18632/aging.102378 Aging 156 ZhangJ

Pharmacol Ther (2013) 140(3):23957

According to Zhou et al

Indeed, it is only in this two-electron reduced form that a reaction by a persulfide becomes productive, resulting in the formation of the TS product

It should be perfectly clear and colorless, just like water