Food Sources of PQQ. PQQ has been found in all plant foods analyzed to date.1 PQQ-rich foods include parsley, green peppers, kiwi fruit, papaya and tofu.3 These foods contain about 2-3 mcg/100 g. Green tea provides about the same amount per 4-oz. Serving.yrroloquinoline quinone (PQQ) is a novel compound found in plant foods that is showing tremendous promise. Health food store retailers need to familiarize themselves as more customers hear about PQQ or are looking for this super-nutrient’s many benefits.