Natural Calm Kids Ionic Magnesium Citrate - Raspberry Lemon - All of the signs of a magnesium deficiency in adults also apply to children. So do the results obtained by handling that deficiency. The only difference is that children don't require as much magnesium as adults do because they have smaller bodies. Put Natural Calm Kids in water and let them drink it. The water acts as a carrier and takes the magnesium to wherever the body needs it. Because magnesium is required for hundreds of enzymatic reactions (enzymes are protein molecules that stimulate every chemical reaction in the body), deficiency can cause a wide variety of symptoms, such as low energy, fatigue, weakness, inability to sleep, weakening bones, muscle tension, spasms and cramps, abnormal heart rhythms, headaches, anxiousness, nervousness and irritability.