Research shows that calcium can actually help you cope with some of the symptoms of PMS. A study of women who took 500 milligrams (mg) of calcium carbonate twice a day for 3 months revealed that they had less fatigue, fewer changes in appetite, and less depression than women with PMS who didn't take the supplement. Does your mood decrease just before your period? Multiple studies have been conducted that show a correlation between magnesium deficiency and depression. One study found that people with depression and magnesium deficiency improved their mood after taking 500 mg of magnesium for more than 8 weeks.
A recent study found that women with PMS who took magnesium supplements found that their PMS symptoms improved. Because there is some evidence that magnesium deficiency can cause symptoms of PMS, some researchers believe that magnesium supplementation may benefit women with PMS.