How are B12 and Wechseljahre related?

The relationship between vitamin B12 and menopause is not clearly supported by the provided context. Generally, B12 levels tend to decline with age, and menopause may affect absorption due to changes in stomach acid and gut microbiome. B12 deficiency can exacerbate fatigue, cognitive decline, and neurological symptoms that overlap with menopausal complaints. However, the context lacks specific studies or biomarker data linking B12 directly to menopause. Therefore, the evidence grade is unclear. A blood test for B12, holotranscobalamin, and homocysteine is recommended before supplementing. Caveat: high-dose B12 without confirmed deficiency is not evidence-based and may mask other conditions.