Slow-Mag Magnesium Supplement 60 Tablets helps with the treatment and prevention of magnesium deficiency. It also helps relieve muscle cramps, fatigue and the effects of stress. Also contains Vitamin C to support the immune system. Magnesium is an all-round do-gooder that gives you what you need when you need it. So if you’re feeling fatigued, magnesium will provide a source of steady energy. If restless leg syndrome and night cramps are affecting your sleep, magnesium will help your muscles to relax, which will help you rest.