Differential scanning calorimetry was used to study the influence of the flavonoid taxifolin (dihydroquercetin) on the temperature-dependent phase transition of dimyristoylphosphatidylcholine multilamellar liposomes. Taxifolin was added to organic solution of the lipid during the procedure of liposomes preparation (addition from-within) or to a suspension of prepared liposomes (addition from-without). In the first case, liposomes contained from 2 to 50 mol% of taxifolin added from-within; in the second case, lyposomes were treated with 0.001% or 0.01% taxifolin. In both cases, the effect was similar. When the concentration of taxifolin increased, the temperature of lipid melting decreased while the width of transition considerably enlarged. Freeze-fracture electron microscopy revealed that taxifolin did not rupture multilamellar liposomes, while the formation of ripple-phase was retarded in all bilayers even when the liposomes were treated from without. This suggested the ability of taxifolin to penetrate through numerous bilayers of multilamellar liposomes.