PHOSPHATIDYL CHOLINE ~ Phosphatidylcholine (PC) is a ubiquitous, naturally occurring phospholipid molecule. It is the major lipid, or fat, of cell membranes and blood proteins. PC is necessary for the composition and repair of cell membranes and is vital for normal liver function. Research indicates PC protects liver cells from viral damage, reduces fibrosis, and prevents cell death from drugs, alcohol and other chemical toxins.