Pure Lab Vitamins' Magnesium Glycinate has been developed in the compounding lab of a community pharmacy in Ottawa, On. It has been used in its original formula since 2002. When dealing with conditions like Chronic Pain, Fibromyalgia, Neuropathies, Spasms, Migraines, Restless Leg Syndrome, Chronic Constipation, Insomnia, or any combination thereof, you need to know, they can oftentimes be traced back to one nutrient deficiency - Magnesium! Large: 240 caplets Small: 90 caplets