North Mountain Supply Yeast Energizer - 1 Pound JarBrand: North Mountain Supply Features: Yeast Energizer 1 Pound Jar Packaged in a plastic jar with a tamper evident air tight seal to ensure quality and freshness! Yeast energizer is a blend of diammonium phosphate, yeast hulls, magnesium sulphate, and vitamin B complex Add 1 2 teaspoon per gallon of wine must to stimulate or restart a fermentation Use 1 4 teaspoon per gallon in beer to revive a slow or stuck fermentation Yeast energizer also works