Magnesium Phosphate (Mag Phos) is the painkiller of the cell salts. It is taken against pains and cramps. It is the eighth of the twelve cell salts and has been called the "homeopathic aspirin" because of its ability to heal acute pains anywhere such as earache, headache, toothache (including teething in babies), and even sciatica—as long as the pains are better with the use of heat and pressure.