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The paper investigates the regulation of the hydrophobicity of KARBON™ carbon adsorbents by restoring its surface during heat treatment in argon and hydrogen, as well as oxidizing it with nitric acid. The sorption capacity of KARBON™ with respect to the tryptophan, arginine, indole, creatinine and vitamin B12 as biologically active organic compounds of different molecular weight was studied. It was determined that the adsorption capacity of KARBON™ samples with respect to all the studied substances changes as follows: Ind>Cr>Trp>Arg>B12. It has been shown that the sorption capacity of argon-treated KARBON™ adsorbent at pH=7.5 is 2.6; 2.7 and 0.09 mmol/g in relation to tryptophan, creatinine and vitamin B12, respectively. The adsorption capacity of these compounds is almost unchanged when the acidity changes from 7.5 to 2.0. The results obtained allows the use of KARBON™ adsorbent as a therapeutic and/or prophylactic agent for oral administration in chronic kidney and liver diseases, as well as a hemosorbent for the purification of blood outside the human body.