People that have experienced allergic reactions to other berries such as strawberries or raspberries should be cautious when eating blueberries. Health Details: There are plenty of health benefits you can get from eating blueberries, but they have side effects too.The benefits are very … Blueberries also contain tannins, which despite providing health benefits also come with some side effects… That being said, they may have some side effects… Some people have reported some stomach issues such as diarrhea when they have consumed large quantities of blueberries … Are there any health benefits of dried blueberries? We are going to discover the answer down below. High … In any case, what about dried blueberries? In an observational study on 20 children with cancer, those who used a multi-herbal formula with bilberry, plume poppy, and echinacea experienced fewer side effects… Dried blueberries contain less salicylate than the raw form. Chemotherapy Side Effects In hamsters, bilberry extract improved mucositis – painful inflammation of the mouth lining caused by chemo drugs. Specialists also do not recommend this substance before and after having undergone surgery, as it may encourage bleeding. Although Vitamin K provides a lot of benefits there are some side effects associated with the intake of high dosage of Vitamin K and for this reason, it is advisable to eat blueberries in moderation. Blueberries: Benefits and Side Effects - Absolute Health. Side Effects of Blueberries. Reinforcing Immune System ; Antitoxins battle contamination.