FIELD: medicine. SUBSTANCE: composition used for prophylaxis or retention of Alzheimer's disease onset has beta- sitosterol, campesterol and stigmastanol and, additionally, it can contain campestanol. Method involves administration of therapeutically effective dose of this phytosterol composition in humans. Invention provides memory improvement but without apparent adverse effect. EFFECT: improved method, enhanced effectiveness of composition. 6 cl, 2 tbl, 4 dwg, 1 ex
