Molecular characteristics of testosterone binding globulin (TeBG) were investigated in microaliquots of human serum samples using 3H-5-alpha-dihydrotestosterone radioligand assays. Under experimental conditions used TeBG demonstrated high conformational plasticity and ability to adopt three conformational states (olygo-, di-, and monomer) with different functional activities. Using alipidspolyene complex from basidiomycete Laetiporus sulphureus we demonstrate a novel effective pharmacological correction of the TeBG characteristics.