URIDINE (Triacetyluridine) Uridine is a nucleoside that is formed when uracil is attached to a ribose ring. Uridine has a crucial influence on important physiologic processes in the human body and is essential for both RNA and DNA synthesis. While uridine is not found in high levels in any particular food, it is an important component of human breast milk. TAU is rapidly converted to uridine in the cell and escapes acid hydrolysis in the gut.