Pomegranate powder is made from fresh pomegranate fruit through the process below, The most abundant polyphenols in pomegranate juice are the hydrolyzable tannins called ellagitannins formed whenellagic acid binds with a carbohydrate. Pomegranate ellagitannins, also called punicalagins, are tannins with free-radical scavenging properties in laboratory experiments and with potential human effects.