Magnesium is an essential mineral for the body. Magnesium, among other things, is related to tiredness and fatigue, the maintenance of bones and normal psychological function. In short, magnesium is essential in approximately 300 reactions in the body; therefore, due to its importance, we have selected the best source of magnesium -citrate- to ensure the highest bioavailability. It is very common to have a magnesium deficiency, and even more so in people who eat few carbohydrates, as is the case in a ketogenic diet.