Blueberry Fruit Extract

Do you know of any possible side effects from taking Blueberry Fruit Extract 1000 MG? I have been taking this for two weeks, and have experienced gastrointestinal distress. Is this normal?

Although I am not familiar with any blueberry fruit extract side effects, is it possible that it could have an effect on the digestive system due to the concentrated astringency that such a product would likely possess. I suggest that you try to reduce the dose or stop taking it for a few days and then reintroduce it and see how you make out.