Magnesium plays a role in maintaining flexible muscles and contributes to the maintenance of normal bones. It also has a positive influence on the functioning of the nervous system and contributes to mental resilience. This formula also contains Vitamin B6 which helps to reduce fatigue. The citric acid added to Magnesium Carbonate turns it into magnesium citrate when mixed with water which is a well absorbed form of magnesium and you get 400mg of Magnesium with one sachet. Usage: Dissolve the contents of 1 sachet in 250 ml of water once a day, creating a deliciously fresh lemon-flavored drink. When the water is clear in color, drink within 30 minutes. Do not exceed recommended daily dosage.