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[121] Age is also a contributing factor: elderly individuals are often achlorhydric due to reduced parietal cell function in the stomach, increasing their risk of vitamin B 12 deficiency
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Pawlak and others reviewed studies of B12 deficiency among vegetarians and vegans using serum B12 (Pawlak, 2014) as well as methylmalonic acid and holotranscobalamin (Pawlak, 2013)
Available online at: (Accessed October 6, 2025)
iii) High risk: Three or more criteria rated as unclear or at least two criteria not met
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