A monoacylglycerol containing oleic acid at the sn-1 position; enhances diffusion of cyclosporin A from the donor compartment of a Franz diffusion cell into the stratum corneum, epidermis, and dermis of porcine ear skin, as well as through the skin to the receptor compartment in a formulation with cyclosporin A in propylene glycol; mixed micellar systems with bile salts increases the Papp and absorption rate of amphotericin B in perfused rat intestine in vivo