Trace Minerals Research Complete Calcium & Magnesium -- 120 Tablets

What the brand says

Complete Calcium and Magnesium 1:1 contains only the finest quality ingredients. A unique blend of calcium citrate, calcium malate, and a specially precipitated calcium carbonate was selected for maximum absorption, Combined with magnesium (primarily from ConcenTrace), nutritional enhancers including vitamin C & D, boron, potassium, grapefruit, and horsetail help to increase the overall effectiveness of this dietary supplement.