research Evaluation of an eucalyptus oil containing topical drug delivery system for selected steroid hormones 75 citations , August 2006 in “International Journal of Pharmaceutics” The eucalyptus oil system improved skin delivery of hormones, but safety concerns remain.
research Skin permeation of different steroid hormones from polymeric coated liposomal formulations 35 citations , October 2005 in “European journal of pharmaceutics and biopharmaceutics” Polymers increased skin permeation and stability of steroid hormones in liposomal formulations.