FIELD : medicine; pharmaceuticals.SUBSTANCE : invention relates to biologically active additives (BAA) in the form of a syrup having high microbiological resistance. BAA in the form of a syrup represents a highly concentrated noncrystallizable sugar solution with the following ratio of components, wt% : total content of sugars – from 60 to 80, wherein at least one of them is noncrystallizable and its amount is from 32 to 80, biologically active additives – from 0.001 to 20, additives – from 0 to 20, water – balance. Water activity in syrup ranges from 0.5 to 0.75 aw, the syrup viscosity ranges from 3, 000 to 10, 000?cP, the sweetness coefficient is from 0.5 to 1.0.EFFECT : invention enables to obtain a finished product with high microbiological resistance, with reduced probability of crystallization and internal chemical reactions between components, as well as longer storage life.4 cl, 3 ex