Magnesium carbonate (not to be confused with magnesium citrate) is an inorganic salt that is white in appearance with the chemical symbol MgCO3. Magnesium carbonate powder is insoluble and does not dissolve in water. Because of its insolubility, magnesium carbonate is often used in table salts to prevent clumping. Also, often referred to as "chalk," magnesium carbonate is commonly used by athletes as a drying agent to aid with grip in sports like rock climbing, gymnastics, baseball, and weight lifting. Magnesium is an essential nutrient found in many foods. Magnesium carbonate supplementation may help maintain overall health and wellness.* Magnesium is used in more than 300 different reactions in the body and may help maintain healthy heart function.* It may also aid in digestion, promote bowel movements, support oral and bone health and fortify the immune system.* Magnesium is an essential mineral that plays a role in more than 300 biochemical reactions in the body. It helps maintain normal muscle and nerve function, keeps heart rhythm steady, supports a healthy immune system, and keeps bones strong. Magnesium carbonate may be used as part of a general health regimen or specifically for supporting cardiovascular health. Magnesium citrate supplements are highly bioavailable because they are easily absorbed by the body as compared to other forms of magnesium. Our magnesium carbonate supplements are available in powder form and does not contain any fillers or additives.