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Description
46 DingM.FengN.TangD.FengJ.LiZ.JiaM.et al (2018)

Rong, S., Segal, S., Anver, M., Resau, J

Do not ignore persistent black stool, especially if it does not resolve within a day or two after stopping suspected dietary causes

It doesn't

As with any emerging area of peptide science, the smartest approach is always following the data not the hype

Many food sources contain vitamin B12 such as, fish, meat, poultry and some diary products but unfortunately not enough for it to be fully absorbed into the blood stream
