Thorne Magnesium CitraMate - 90 Capsules | Thorne A well-absorbed form of magnesium that supports the heart and skeletal muscles.The mineral magnesium is crucial for the body to function properly because magnesium is involved in more than 600 of the body's enzymatic reactions.According to World Health Organization statistics, as many as three of every four U.S. adults don’t achieve the U.S. Food and Drug Administration's Recommended Daily Intake of 420 mg of magnesium. A magnesium deficiency can manifest in many ways, such as poor blood sugar metabolism, muscle cramps or soreness, eyelid twitching, fatigue, and poor sleep.