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Vegans, older adults, those with malabsorption conditions, and people taking metformin or proton pump inhibitors are at higher risk of B12 deficiency
People often describe it as a rapid, irregular, or "quivering" heartbeat
Both have excellent safety profiles with no known interactions
Gartlehner G, Wagner G, Matyas N, et al
1,2,6 Skin hyperpigmentation, glossitis, and infertility have also been reported
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