RE-FLEX: Nutramarc RE-FLEX Specifically designed for bodybuilders and athletes. Nutramarc RE-FLEX combines time tested nutrients to help support joint cartilage and overworked joints related to exercise. If you’re a serious lifter then you know heavy lifting puts extreme stress on your muscles and joints. It’s for this reason that it’s essential to provide your body with the firepower it needs to come back ready for the next battle. RE-FLEX is an excellent dietary Supplement. Not for medical use.