Mag365 kids magnesium supplement contains magnesium calcium zinc vitamin b1 vitamin b6 vitamin d3 vitamin k2 and vitamin c for growth relaxation and immunity this kids magnesium formula for children will relax the nerves and help a child to grow concentrate and stay healthy contains no sugar sweetened with natural passion fruit flavouring and stevia magnesium is necessary for muscles to relax calcium excites nerves while magnesium calms them down