This proprietary blend of nutrients has been optimized for great solubility of nitrogen in your fermentations. This product contains peptone and yeast extract that provides essential fatty acids, free amino nitrogen, nucleic acids, vitamins and minerals for your yeast. It is 100% free of Diammonium Phosphate (DAP), containing no inorganic sources of nitrogen. For 5 gallons use 5.65g to 8g (0.2oz to 0.28oz)