Daily How Much

One medium banana contains about 32 mg of magnesium, based on USDA data and standard serving sizes.

One cup of cooked black beans provides about 120 mg of magnesium, based on USDA data.

One cup of whole almonds delivers roughly 385–410 mg of magnesium, with exact numbers shifting by cup weight and roast.

For adult women, a common daily target is 200–350 mg elemental magnesium from glycinate, adjusted for age, pregnancy, diet, and tolerance.

Most adults start with 100–200 mg elemental magnesium from glycinate daily, staying under the 350 mg supplement cap.

During pregnancy, aim for total magnesium near the RDA and keep supplemental magnesium at or below 350 mg elemental per day.

Women over 70 generally need 320 mg of magnesium per day from all sources.

For children’s sleep, aim for daily magnesium from food that matches age-based needs; supplements aren’t a sleep fix for most kids.

For torsades de pointes, give magnesium sulfate 2 g IV, then repeat or infuse as needed based on rhythm and risk.

For magnesium glycinate, daily elemental magnesium limits are 65 mg (1–3 y), 110 mg (4–8 y), and 350 mg (9–18 y).