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Aptus MassBoost is an organo-mineral plant booster that prevents Calcium (Ca) and Magnesium (Mg) deficiencies while stimulating powerful fruit set and development. Calcium and magnesium are very active molecularly and are easily locked up or combined with other minerals in the growing medium. Both minerals are extremely important for floral and fruit set and development. MassBoost provides both minerals in a highly bioavailable form by chelating in L-amino acids. The L-amino acids also help to minimize antagonism with other minerals in the growing medium.