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Magnesium Rich Food Sources. Green vegetables such as spinach are good sources of magnesium because the center of the chlorophyll molecule (which gives green vegetables their color) contains magnesium. Some beans, peas, nuts, seeds, and whole, unrefined grains are also good sources of magnesium.
The sources of magnesium include food, water, and supplements. While clearly a âgoodâ source of magnesium is one that is readily available and easily absorbed, most experts recommend a combination of sources, taking advantage of both dietary magnesium and absorbable magnesium supplements.raditionally, foods highest in magnesium content are green vegetables, whole grain cereals, nuts and beans, and seafood. According to USDA food charts (see a complete chart of magnesium rich foods), the five foods with the highest magnesium per typical serving are: 1  Halibut. 2  Mackeral. 3  Boiled spinach. 4  Bran breakfast cereal.