Used to increase the health of yeast. Improves fermentation and re-pitching performance. Contains diammonium phosphate, essential vitamins and co-factors, nitrogen (amino acids, proteins, and peptides) and minerals. Effective boost for first and/or late generation yeast slurry. If grist is not 100% malt, then yeast nutrient can help make up for lack of nutrients. Each vial contains 1.0oz, enough for 5bbls. 1/4-1/2 teaspoon per 5 gallons.