Phosphatidylcholine

Hi, on Dr. Jay Cohen’s website he recommends the supplement phosphatidylcholine. Has anyone ever tried this supplement? Has it been effective? In what form have you taken it? (For example, it is a major component of lecithin, and lecithin is a rather inexpensive supplement. Also, it could be taken in its purified form, but this is pretty expensive. Also, you can just take a choline supplement assuming that it is the choline portion of the molecule that that the body needs the most.)