Are There Any Known Side Effects with Polyphenol Booster? September 22, 2023 20:24 Updated There are no known side effects of taking the extracts contained in Polyphenol Booster. Related articles What is Pendulum's Money-Back Guarantee? Can I Open the Capsule When Taking Polyphenol Booster? How Do I Store Polyphenol Booster? Do You Offer a Discount for First Time Customers? How is Pendulum Glucose Control Different From Other Probiotics?