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Some people on weight loss plans might get less B12 because they are eating fewer calories or certain foods, especially if they follow vegetarian or vegan diets
Brazeau, A.-S
Mark Krause, the labs jovial, broad-shouldered director, walked me past dishwasher-size chromatography and mass-spectrometry machines
Neurophysiol Clin
A "natural" origin of a substance tells you nothing about overall safety at a synthetic dose, by an unphysiological route, in a manufactured form whose purity is not independently verified
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