good sources of magnesium in food
Print. The sources of magnesium include food, water, and supplements. While clearly a âgoodâ 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.