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Some small studies suggest B12 (especially with B6) may reduce nausea, though more research is needed [*]

And lets not forget the added bonus of more energy and improved overall well-being

Cyanocobalamin (Vitamin B12)

Theyve revolutionized obesity treatment with average weight loss of 15-22% of body weight in clinical trials

So if someone is low in B12 and they consume alcohol, they not only don't have enough B12 to help 'clear away' the alcohol toxins but they also risk increasing homocysteine levels which I believe is that feeling of heat/hangover that can persist when there isn't enough B12 to reset the body