Animal fats can possibly penetrate, why is emu oil different?
Emu oil contains no phosphorus molecules. Since our skin is phospholipid deficient, it will not let anything containing a phosphorus molecule penetrate through it. It is a non-polar monounsaturated fatty acid as well (non-polar fatty acids move through cells more easily). It has short chain fatty acids (as most animal fats do) but acts like a long chain fatty acid (like most plant oils). In fact, emu oil resembles olive oil or cottonseed oil more than an animal fat. It is an almost 100% triglyceride lipid.