Hello - I take Adderall and Vyvanse (lisdexamfetamine) daily. May I take a magnesium oxide/zinc sulfate/calcium carbonate supplement?

Yes you may. You should be just fine taking your supplements, but please consider taking them at night. This would help prevent any changes in the absorption of your ADHD medications.
Levels? Magnesium and Calcium are important divalent cations. Blood levels can be obtained from your physician. Magnesium levels should be between 1.8 and 2.2. (a fairly narrow range). You may want to discuss zinc supplementation with your doctor as well. A balanced diet in the absence of kidney disease, malabsorbtion, metabolic bone disease or Vitamin D deficiency should usually suffice.

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