The purposed of this study was to determine the best optimation of fortification ofmicroalgae Chlorella sp. That required by bacteria Acetobacter xylinum in the fermentation of Natadecoco. The methode used in this researched was experimental with completelyrandomized designed (CRD) non factorial with 4 levels treatment C1 (without Chlorella sp. flour, urea 5 g), C2 (2 g of Chlorellasp. flour), …