Rapid release soft gel capsules Food supplement Fat emulsifier Lecithin describes a combination of naturally occurring phospholipids, which are extracted during the processing of soybean oil. In recent years lecithin has become increasingly popular as a food supplement. It is present in every cell within the human body, in the form of cell membranes. Rapid release soft gel capsules Food supplement Fat emulsifier Lecithin describes a combination of naturally occurring phospholipids, which are extracted during the processing of soybean oil. In recent years lecithin has become increasingly popular as a food supplement. It is present in every cell within the human body, in the form of cell membranes.