What are Powerphenols? Customer Service June 20, 2023 22:21 Updated Powerphenols are the supplements discussed beginning on page 65 of your Glow15 book: Berberine, EGCG and resveratrol. You'll take these on your Low and High days with meals (meaning twice on Low days and three times on High days). Related articles Can Berberine cause upset stomach? Is Berberine estrogenic? I have GERD; can I do the Glow15 program? Can I drink coffee during Glow15 fasting hours? What is a substitute for avocado in your Glow15 recipes? Comments 0 comments Article is closed for comments.