Yeast Nutrient in a 100g resealable pouch by Almost Off Grid. Yeast Nutrient is a mixture of vitamins and minerals combined used to ensure rapid and complete fermentation of wine. Yeast nutrient does not contain yeast, it is designed be used in conjunction with any yeast culture. Usage: 1 level teaspoon per gallon. Dissolve in a cup of water, add to the vessel and shake well. Storage: store in a cool, dry place.