what is the recommended dosage of magnesium
It's safe to get high levels of magnesium from food. But excessive use of magnesium supplements can be toxic. The upper limit -- the highest dose a person can take -- of magnesium supplements is: 1  65 mg/day for children ages 1-3. 2  110 mg/day for children ages 4-8.  350 mg/day for adults and children ages 9 and up.