Peter Gillham's Natural Vitality Natural Calm Plus Calcium is formulated to prevent a surplus of calcium robbing the body's vital magnesium supply and to avoid the symptoms associated with depleted levels of magnesium. Natural Vitality Natural Calm Plus Calcium's premeium formulation includes vitamin D, boron and vitamin C to facilitate the assimilation, distribution and utilization of calcium. Natural Vitality Natural Calm Plus Calcium is excellent for athletes and anyone who works out. Natural Vitality Natural Calm Plus Calcium assists in preventing muscle cramping and helps reduce lactic acid.