Athletes put their bodies under intense stress. Strenuous exercising and sweating (due to exertion and high temperatures) cause the body to lose magnesium. Many athletes are deficient in both calcium and magnesium. Magnesium is also essential in addressing an issue common to almost all athletes—muscle cramping. When cramping occurs in workouts or competition, it is a sign of low magnesium levels. Natural Calm Plus Calcium balances a highly soluble and bioavailable form of calcium with Natural Calm —the best-selling, award-winning magnesium supplement—plus key vitamins and minerals. The objective is to supply nutritional cofactors needed to obtain benefit from calcium without lowering vital magnesium levels or building up unabsorbed calcium in the body. Both original and organic raspberry-lemon Natural Calm Plus Calcium are available in convenient individual sports/travel packs.