Although linked with many health benefits and generally considered a safe way to add flavor to foods, star anise should be used in moderation to prevent negative side effects.
Make sure that you are using Chinese star anise and not Japanese star anise. The Japanese version is inedible and actually poisonous if consumed by mouth.
Some products containing star anise, such as teas, are believed to be contaminated with small amounts of Japanese star anise. For this reason, this spice is not recommended for infants and children as it has been associated with a number of adverse symptoms, like vomiting and seizures, due to contamination.
There is also not enough evidence to determine the safety of this spice in women who are pregnant or breastfeeding. Stay on the safe side and talk to your doctor if you have any concerns.
Finally, if you experience any negative side effects or food allergy symptoms after consuming star anise, discontinue use immediately and consult with a trusted health care practitioner. ~ Rachael Link, RS, RD