Magnesium on the Edge: How Much Is Safe?

Magnesium can help sleep and recovery, but excess can cause diarrhea and, for people with kidney issues, more serious problems. Experts suggest keeping total daily intake at or below about 400 mg of elemental magnesium from all sources; common supplement doses range from 100–200 mg (up to 350 mg). Read label terms for elemental magnesium, avoid stacking multiple magnesium products, and watch for interactions with certain medications. Consult a clinician for personalized dosing.