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Table 2
The stomach needs sufficient stomach acid to retrieve the vitamin from the protein
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When your B12 levels are optimized, your metabolism functions more efficiently, which may help you burn calories more effectively even at rest
Lluch, J
However, some rare side effects of too much vitamin B12 can include: Headache Weakness Nausea Diarrhea Tingling sensations in the hands and feet Allergic reactions or skin rash (uncommon) When To Seek Medical Advice Risk of vitamin B12 deficiency: Groups at a higher risk of vitamin B12 deficiency include older adults, people who only eat plant-based foods (vegans and vegetarians), and those with certain chronic conditions (gastrointestinal disorders that can affect vitamin absorption)
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