the elderly, strict vegetarians (i.e., vegan), and patients with malabsorption problems are more likely to become deficient
Grassin-Delyle S, Naline E, Buenestado A, Risse PA, Sage E, Advenier C, Devillier P
While there is no one-size-fits-all answer, research suggests that taking glutathione in the morning on an empty stomach may lead to better absorption and utilization by the body
Nutr Rev 54 : 130
And, indeed, when you put all the observational studies together, we find there is no signicant correlation between the levels of B12 in the blood and lung cancer, whether or not you smoked