No, there are no vitamins in Kuvan. Kuvan’s only purpose is to kick start the enzyme in our bodies that don’t work (PAH) so that we can break down more phe. It is only meant to decrease phe levels and doesn’t act as formula. My formula intake did decrease when I began Kuvan, but only a little bit. I think the main reason I don’t have to take as much formula is because I am able to eat more protein from foods and I don’t need to consume as much protein from formula.