Phosphatidylcholine Best Emollient Hydration Phosphatidylcholine description Active ingredient in lecithin. PC is considered a very good water-binding agent and aids in the penetration of other ingredients into the skin. It absorbs well without feeling greasy or heavy (although other ingredients can perform similarly, including glycerine, ceramides, and hyaluronic acid). Related ingredients: Lecithin Choline Hydrogenated Phosphatidylcholine