Is Vitamin D 25-OH useful for menopause?

Measuring 25-OH vitamin D levels is useful during menopause because declining estrogen accelerates bone loss, and vitamin D is critical for calcium absorption and bone health. Deficiency (<20 ng/mL) or insufficiency (20–30 ng/mL) increases osteoporosis risk. However, a blood test is the gold standard; DNA tests for VDR or other vitamin-D-related genes have small effect sizes and are not clinically actionable for dosing decisions. Evidence is based on clinical practice and observational studies (practice-level), not on robust genetic prediction. Supplementation should be guided by measured levels: typically 800–2000 IU/day, with higher doses only under medical supervision (max 4000 IU/day). MyBody-X's DNA test may offer background insights but cannot replace a blood test or clinical advice. Caveat: a single measurement is a snapshot; repeat testing and physician consultation are recommended for long-term management.