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A patient with unexplained fatigue should be worked up, not injected masking a B12 deficiency of unclear cause, or an unexamined thyroid problem, with a monthly shot is a real clinical risk
Plants have no B12 requirement
Acta Med Scand (1968) 184(4):24758.10.1111/j.0954-6820.1968.tb02452.x 4 WitheyJLJonesJHKilpatrickGS
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