Is Juvederm sourced from humans, animal, or synthetic DNA?

Does the source of Juvederm come from live humans or dead humans? I understand that Juvederm is naturally occurring; and that injections of hyaluronic acid (such as Juvederm) are intended to temporarily replace loss through the normal aging process (thereby, reducing appearance of wrinkles etc). However, where does the source of the Juvederm used in these injections come from? Dead or live donor humans, synthetic reproduction or animal DNA? I need full disclosure to enable an informed decision to proceed with this treatment. Thank you for your consideration.