White Labs Yeast Nutrient is used to increase the health of yeast. It contains diammonium phosphate, essential vitamins and cofactors, nitrogen (amino acids, proteins and peptides), and minerals. It is an effective boost for first and / or late generation yeast slurry. This vial is 1 oz (28.3 g).
Usage: Add 1/2 teaspoon per five gallons of wort at the last 15 minutes of the boil.