The sorption activity of carbon sorbents obtained from organosolvent lignin of fir wood with respect to methylene blue, vitamin B₁₂ and gelatin was studied. The influence of pH values of model solutions on the sorption of methylene blue and vitamin B₁₂ was established. The data on the kinetics of sorption of these marker substances by carbon sorbents from lignin of fir wood was presented. It was found that the ability of the studied sorbents to sorb the marker substances exceeds the industrial activated carbons used for medical purposes.