ConsumerLab.com reviews magnesium supplements

WHITE PLAINS, N.Y. ConsumerLab.com on Tuesday reported that among 12 magnesium supplements selected for testing, only nine met quality standards.

One supplement contained only 45.4% of its labeled amount of magnesium, the online company reported. Another supplement provided only 28.8% of its promised magnesium. 

Magnesium supplements can help prevent migraine headaches, menstrual pain, and magnesium deficiency. Certain forms of magnesium are key ingredients in popular laxatives.