CalMag Pro complete Calcium and Magnesium supplementation product, is everything you need to prevent deficiencies and build stronger healthier plants. Some growing media or plant strains need higher than normal amounts of Calcium or Magnesium. This product will fix and prevent deficiencies from these types of issues. Also, this product acts as a secondary Nitrogen booster, with 2 separate sources of Nitrogen. Legal Disclaimer: This product does NOT contain any pesticides, synthetic PGR’s, or and other EPA regulated ingredients. This product is fully compliant with all EPA rules and regulations. This product meets or exceeds all OMRI and state guidelines for heavy metals verified through independent lab testing, and is safe to be used on crops meant for human consumption.