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Phenylalanine has been around as long as life itself, if not longer. It's not something that someone invented one day. It's like oxygen: no one invented it, it's been here as long as anyone can remember, and far longer! J. Heinrich Matthaei and Marshall W. Nirenberg figured out a way to make a bacterium produce long chains of phenylalanine molecules in 1961.
Phenylalanine is an amino acid that the body cannot make on its own. The body needs to get phenylalanine from an outside source. There is a wide variety of foods that contain phenylalanine. Most of these foods can be found in the major food groups. Fortunately for the taste buds, the sources of phenylalanine are usually good tasting too. Dairy foods such as milk and eggs contain phenylalanine. Also products made with dairy such as yogurt and cheese also have phenylalanine. Soy products, whole soy, or soy protein (such as tofu) have both protein and phenylalanine.