Results: Completing the process of quantifying ginsenosides Rb1, Rg1, Rf, Re in food supplements by LC-MS / MS method. Limit of determination was 0.5 µg / mL, limit of quantitation was 2.0 µg / mL, the precisions of method were respected with RSD% < 20%, the recovery efficiencies were in about 80 - 110%.