Cramp Defense Original High Absorption Fast Acting 180 Capsules Low magnesium is one of the main reasons people get muscle cramps. The problem is, most magnesium supplements don't absorb well and can upset your stomach. Cramp Defense is different — it's a highly absorbable magnesium that works without the uncomfortable side effects. It also includes malic acid, the same ingredient that makes vinegar and pickle juice popular home remedies for cramps. Plus, our double-sized value bottle gives you more for your money. Would you also like a few more versions depending on the tone you're aiming for (friendly, professional, persuasive, etc.)?