Dietary supplements with phospholipids The pure phospholipids, which are obtained from sunflower oil, are important components of the membrane and therefore serve as basic building blocks of cells. They also contribute to metabolism. The enteric-coated capsules also contain vitamin B1 for the normal function of the nerves and psyche, as well as biotin to support the normal function of the mucous membranes. Vegan. Lactose-free, gluten-free, peanut-free, soy-free.