Phosphatidylcholine (PC) is one of the most important nutrients to consume daily for optimal health. PC is found in nuts, seeds, dandelion greens, egg yolks, liver, and certain seafood items: foods we consume too little of to get an optimal intake of PC. Most adults do not get enough of this valuable nutrient. Phosphatidylcholine (PC) is the basic building block of the membranes of every cell in the body. Without PC, cells age faster and do not function optimally. PC also helps encourage healthy fat metabolism by emulsifying fat.