What role does Vitamin D 25-OH play in menopause?

Vitamin D 25-OH (calcidiol) is the primary storage marker for vitamin D status. During menopause, declining estrogen levels impair calcium absorption and bone metabolism, making adequate vitamin D crucial for bone health and osteoporosis prevention. Observational studies also suggest potential benefits for mood, immune function, and cardiovascular risk factors, but the evidence is moderate and not conclusive. Measuring 25-OH vitamin D via blood tests can help detect deficiency and guide supplementation. However, optimal target levels are debated; most guidelines recommend 50–75 nmol/l. Testing alone without medical advice is insufficient, as overdosing (toxicity) is possible. Genetic factors (e.g., VDR polymorphisms) may modulate vitamin D action, but lifestyle (sun exposure, diet) dominates. In summary, vitamin D 25-OH plays a supportive but not standalone role in menopause; screening is reasonable but should be part of a holistic approach including calcium intake, exercise, and medical supervision.