magnesium

[bmom]

According to Bonnie's website for Bontech my son- since he is over 8 years should take 500 mg of magnesium daily. I have had him on 250 with Kids Calm, but I switched him to Bonnie's as it seemed easier and more comprehensive then all my individual. Anyway, is 500 too much or is that what he really needs? or should I keep him around 300 mg? How much do your children take? My son is 9 and 70 pounds. Thanks. I did just have another hair analysis done and it showed him in average range for magnesium-high average- with the 250. I was seeing some small ticcing every once in awhile.