If I don't see that my mother, age 87 with PD, gets 1500 mg of Calcium citrate and 750 mg of Magnesium daily, she will experience cramps in the calves of her legs during the night. The actual product we use is Boron Complex Plus from the Vitamin Shoppe. 1-800-223-`1216 Four capsules supply: Boron 3mg . . . aids in the absorption of the Calcium Calcium . . . . . .1000mg Magnesium . . .500mg Vitamine D- . . .3400 IU Zinc . . . . . . . . . 15mg Copper . . . . . . 500mcg Bentaine HCL.324mg She also takes 1200 mg of Vit. E which is supposed to help prevent muscle pain. When she first developed muscle cramps I didn't associate it with Parkinsons but reached for the calcium right away. And it worked. Carol Brow daughter of Mary Louise Brow Lake Leelanau, Michigan and Winter Haven, Florida