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Vitamin B 12 deficiency has been observed in between 40% and 80% of the vegetarian population who do not also take a vitamin B 12 supplement or consume vitamin-fortified food
doi:10.1210/jcem.81.1.8550773 van Bloemendaal L, IJzerman RG, Ten Kulve JS, et al
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Devesa J, Almenglo C, Devesa P
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