A 28-year-old woman estimates she consumes 320 mg magnesium/day from foods and plans to take a 250 mg supplemental magnesium tablet daily. Is she within the recommended supplemental UL and what is her total magnesium relative to the RDA for females 19–30? Show reasoning.

• A. Yes — her 250 mg supplement is below the supplemental UL of 350 mg; total intake ≈ 570 mg/day, which exceeds the RDA for females (~310 mg).
• B. Yes — her supplement is well below the UL and the total intake equals the RDA exactly, so no adjustments are needed.
• C. No — her supplement exceeds the supplemental UL; total intake is below the female RDA so she needs more magnesium.
• D. No — supplemental UL is only relevant for males, and for females there is no supplemental limit; therefore the supplement is unrestricted.

Answer: (A)