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Most people who eat non-vegetarian food meet their B12 needs

While the MTHFR mutation doesnt directly lead to vitamin B6 (pyridoxine) deficiency, there may be connections between these two

Most people start to notice an improvement in symptoms from vitamin B12 deficiency within the first week

A case-control study on adverse effects: H2 blocker or proton pump inhibitor use and risk of vitamin B12 deficiency in older adults

Subgroup analyses evaluated four key factors: administration route efficacy, daily dosage, age group and clinical conditions that may affect vitamin B12 metabolism (e.g., underlying pathology)

Quality can vary significantly between different brands, depending on the form and the manufacturing process