Fermoplus Premier Cru contains enzymatically pre-treated yeast hulls that provide a high concentration of sterols and promote sugar depletion, thus preventing increases in volatile acidity. Through the action of its ellagic tannins, it lessens the formation of olfactory defects, mahes oxygenation more effective and increases colour stability. Its cellulose fibres perform an absorbing action towards exogenous toxins and medium-chain fatty acids that may hinder the fermentation run.