Milk of magnesia is very poorly absorbed and cannot be used as a magnesium supplements because magnesium is poorly soluble in water. The form of magnesium that gets into the blood stream are those magnesium that are water soluble such as magnesium chloride, magnesium diacetate, magnesium gluconate, magnesium citrate, etc. Magnesium oxide and magnesium carbonate are also are also very limited solubility and also poorly absorb too. Ringing of the ears is often a magnesium deficiency, but I also found people with fibromyaglia (which causes b complex deficiency) can have ringing of the ears just from a b complex vitamin Deficiency. High heavy metals can be sensitive to soung, but also causes ringing. Taking too much aspirin too frequently can cause ringing of the ears, but then I also found myself ringining of the ears until I became temporarly deaf from taking aspartame softdrinks long time ago too. A heavy metal can be reduced with chlorella/spirulina, at the same time avoiding certain food triggers and toxins. Fluoridated water increases aluminum absorption by 600% so long term can also lead to possibly ringing of ears. Hence chlorine, fluorine, aspartame, and other heavy metals I think should also be avoided too. The ringing of the ears can be decreased with vitamin B 50 once every two days, and usually 1/2 teaspoon of baking soda in 1/2 glass of water taken twice a day, along with magnesium supplements.