Our members love 4D! Most take it each day, especially if they have a workout. It provides great energy without the crash like other products. We really like that they also get their multi vitamin from it; it simplifies all the supplements you would take in a given day. Some of our members have even noticed an improvement in their joints from the glucosamine. I love that I can provide a quality supplement that also supports our bottom line. It's the one retail product we consistently sell in the club.