Controlled release composition

A controlled-release composition for a biologically active material, which composition is liquid or liquid crystalline and consisting essential of at least one medium or long chain fatty acid ester of diglycerol as a carrier for said biologically active material, wherein said fatty acid of said diglycerol ester is selected from the group consisting of C6-C18-fatty acids and mixtures thereof;

• wherein the fatty acid ester of diglycerol is the only carrier for the biologically active material;
• wherein said biologically active material being dissolved or dispersed in said carrier;
• wherein said fatty acid ester of diglycerol comprises more than 50% of the monoester thereof;
• and
• wherein said liquid or liquid crystalline phase is selected from the group consisting of lamellar liquid crystalline phase, cubic liquid crystalline phase, reversed liquid crystalline phase, homogeneous liquid phase of such a composition that it is transformed into a liquid crystalline phase or micellar solution when contacted with water or any other polar liquid, or mixtures thereof.