Yeast Nutrient fortifies your yeast during fermentation.  When yeast multiply the outer skin gets thinner at each split.  This makes the yeast more vulnerable as the alcohol fermentation gets under way.  Yeast Nutrient used at about 1/3 sugar depletion will strengthen the yeast against the alcohol that is now being generated.  Using Nutrient allows more viable yeast through the whole fermentation lessening the chance of a stuck fermentation.

 

We carry 2 Yeast Nutrients.  Super Ferment and Fermaid K