Calcium is essential for humans and plants. Our SensiCal Grow supplies three types of Calcium (including Calcium Chelate), along with Magnesium, Iron, Manganese, Zinc, Copper, Boron, Molybdenum and Cobalt. SensiCal Grow supplies these essential substances in the exact ratios and amounts that specialty plants need. Our extensive field testing on the types of plants you grow helped us create a product that properly deals with the necessity for proper, synergistic balance of Calcium, Magnesium and other minerals. Our research program compared SensiCal Grow to all Calcium products made by competitors. We found that their products only contain inferior grades of Calcium, Magnesium and Iron, which is why SensiCal Grow consistently outperformed their products. Indeed, our scientists say that their products' reliance on Iron actually interferes with plant uptake of Calcium and other minerals. If you want the best Calcium and micronutrient supplementation for your crops in vegetative cycle, use SensiCal Grow, backed by our industry-leading performance guarantee.