What to watch with B12 and menopause?

During menopause, vitamin B12 metabolism is affected by several factors: declining stomach acid production (atrophic gastritis becomes more common) reduces the release of B12 from food proteins. Additionally, the need for B12 in cell division and energy production increases, while intestinal absorption may be impaired by age-related changes and medications (proton pump inhibitors, metformin). Deficiency often presents as fatigue, concentration problems, tingling in hands/feet – symptoms that can be mistaken for menopausal complaints. Evidence for routine B12 supplementation in menopause is moderate: observational studies link low B12 levels to increased fatigue and cognitive decline, but randomized controlled trials do not show clear benefit from supplementation without proven deficiency. Safety note: B12 is water-soluble and excess is excreted, but very high doses (over 1000 µg/day) may cause acne or drug interactions. Recommendation: measure serum B12 (including holotranscobalamin or methylmalonic acid for functional status) before supplementing. If deficiency is confirmed, oral or sublingual doses of 100–500 µg/day are reasonable. Blanket high-dose supplementation without testing is not evidence-based.