Controlled release composition forming a reversed micellar (L2) structure or a normal micellar (L1) structure

A controlled-release composition for a biologically active material, comprising:

• a) monocaproin, optionally in admixture with monocaprylin or monocaprin or a mixture thereof, or
• a) in admixture with b) a polar liquid selected from the group consisting of such polar liquids which are capable of forming an L2 phase with a) and
• c) a biologically active material dissolved or dispersed in a) or said mixture of a) and b), a) being present in the composition in such an amount where a) or said mixture of a) and b) forms a reversed micellar (L2) structure up to 100% by weight of a) based on the total weight of a)+b), with the proviso that said mixture of a) and b) is also essentially within that specific domain of the L2 structure, in a phase diagram, where said L2 structure will change to a normal micellar (L1) structure if contacted with an external polar liquid, the composition releasing said active material via a successive change from L2 structure into L1 structure without any phase separation when contacted with said external polar liquid.