Magnesium Sulfate 7-Hydrate, (For Parenteral Use) USP -GenAR, 100LB, Avantor Performance Materials, Inc., 3472 Corporate Parkway, Suite 200 Center Valley, PA 18034. 610-573-2600.
Failed Impurities/Degradation Specifications: Out of specifications results for impurities.
Distributed in the US including: CA, IL & NC; Canada
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=D-0563-2016