The only nuclear medicine procedure i know for imaging the pituitary gland, a rather exotic one, ist I-123 IBZM (iodobenzamide) SPECT in prolactinomas. in general, pituitary diseases are investigated with MRI. but Tc-99m MIBI can visualise the parathyroid glands.
Excessive use of magnesium supplements can be toxic. The upper limit -- the highest dose a person can take -- of magnesium supplements is: 65 mg/day for children ages 1-3. 110 mg/day for children ages 4-8. 350 mg/day for adults and children ages 9 and up.
The recommended amount of sodium that you should consume in a day depends on your age. Children ages 2 to 3 need 1,000 mg of sodium a day. That amount increases to 1,200 mg a day from ages 4 to 8 and 1,500 mg from 9 to 18. Adults need 2,300 mg of sodium a day, which is equal to about a teaspoon of salt. Your doctor might suggest that you consume less than the recommended amount of sodium if you have certain health risks.