<p>Carbon tetrachloride (CCl4) disrupts the stable operation of biological membranes, causing disturbances in the lipid bilayer, as well as changes in the properties of membrane lipids. The protective effect of a lipid complex isolated from the marine red alga <i>Ahnfeltia tobuchiensis</i> and the reference drug “Essentiale” was investigated on the plasma membranes of mouse erythrocytes, obtained in the modeling of toxic hepatitis induced by CCl₄. The lipid extract from <i>A. tobuchiensis</i> was not inferior in efficiency to the phospholipid preparation Essentiale in restoring the indices of both membrane lipids and blood plasma lipids, as well as in normalizing the parameters of antioxidant protection of the organism. The membrane-protective effect of algal extract is due to its multicomponent composition including glyco- and phospholipids with predominance of polyunsaturated fatty acids of the n-3 and n-6 families.</p>