Pmd flex stack reviews. Product Information product. There is one at the official site:. It is important to realize that the Flex Stack Hardcore system includes two different formulas that works in combination to provide better results. No cash value. The main advantage here is that this comes with a lot of ingredients. Start typing your question and we'll check if it was already asked and answered. This product contains a chemical known in the state of California to cause birth defects or other reproductive harm. Below are our most effective testosterone boosters that have been ranked on the basis of these essential factors.