Posted by iHerb Customer on Apr 28, 2009 | Verified Purchase
I've used Source Naturals Magnesium Malate for years now. It's a great product at a great price. Malic acid with magnesium has been shown to be one of those low-cost but effective supplements for muscle pain in patients with fibromyalgia. Taking an extra one or two is also useful for the occasional medication related constipation.