evidence: MD: The Active Ingredient in Star Anise Is the Same One That Powers Tamiflu — Here’s How to Reap the Immune-Boosting Benefits [...] Many of us who come down with a cold or flu simply ride it out by getting rest, drinking plenty of fluids, and treating symptoms with over-the-counter pain relievers or decongestants. Sometimes, though, you need the help of antiviral medication such as Tamiflu (oseltamivir). This is where the benefits of star anise come into play. Tamiflu contains shikimic acid — the same compound found in star anise! "Shikimic acid is a primary component used in the synthesis of the antiviral drug oseltamivir, which is a neuraminidase inhibitor that is used to treat and prevent influenza A and B," explains Dr. Bhanote. Neuraminidase inhibitors block the release of newly formed viruses from the surface of host cells. This prevents their spread to other cells, according to research in EC Clinical and Medical Case Reports.