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Magnesium Report

Summary

Labdoor analyzed 30 of the best-selling magnesium supplements in the United States for magnesium content and heavy metal (arsenic, cadmium, lead, mercury) contamination.


Products in this batch analysis measured an average of 347 mg of magnesium per serving, ranging from 62 mg to 921 mg. On average, products deviated from label claims by 6.3%. 16 products exceeded magnesium’s Tolerable Upper Intake Level (350mg), the threshold at which a risk for adverse effects like diarrhea and nausea appears for most people.


Analytical Chemistry Methods: ICP-OES (Inductively Coupled Plasma - Optical Emission Spectrometry) to quantify levels of magnesium, calcium, copper, iron, manganese, phosphorus, potassium, sodium, and zinc; ICP-MS (Inductively Coupled Plasma - Mass Spectrometry) to quantify heavy metal (arsenic, cadmium, lead, mercury) load.