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Dietary Supplement Source Naturals Phosphatidyl Choline provides premium quality and potency. This product has been concentrated to contain 3 times the phosphatidyl choline found in ordinary lecithin. Phosphatidyl choline is a naturally occurring molecule that is composed of choline phosphoric acid and hydrocarbons. It is one of several phosphorus-containing lipids that form the structural elements of all cell membranes in the body.