FIELD: food and chemical-pharmaceutical industry. SUBSTANCE: addition has 88-92 wt.% of dihydroquercetin and 8-12 wt.% of dihydrokaempferol. Addition is prepared by extraction of larch milled wood with water at heating followed by cooling, filtration, evaporation of extract and its dissolving in organic solvent. Then the end product is purified by column chromatography on silica gel and product is eluted by an aqueous-spirituous solution. Product is evaporated and crystallized from the solution. Prepared biologically active addition is both effective as food addition and provides effective prophylaxis of many diseases and enhances human body defense system. EFFECT: enhanced effectiveness of addition, improved method of preparing. 3 cl, 3 ex
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