Stable emulsions comprising as a base one or more diene conjugated fatty acids. Amino acids and other macromolecules can be used to stabilize the emulsion. The emulsion is also useful as a carrier and delivery vehicle of the macromolecules to humans or animals in need of the macromolecules. Plant oil extracts, such as conjugated linoleic acid and its acylated derivatives, are useful as the diene conjugated fatty acids that form the base of the stable emulsion. The emulsions formed are useful as nutritional or cosmetic adjuvant for oral based nutrition, skin diseases, cosmetic utility, enhancing oral nutrition, or pharmacological benefit. Methods of producing and using the emulsions are also provided.