Yeast Nutrient assists beer and wine yeast in producing a complete and rapid fermentation. It is recommended for use in all fermentations. Yeast Nutrient provides a singular source of nitrogen for the yeast to utilize during the fermentation process. Nitrogen is typically found to be naturally lacking in most wine musts. Insuffecient levels of nitrogen usually results in a sluggish fermentation and can also lead to the production of unwanted fusel oils which can be detected as off-flavors in a finished wine.