My husbands friend uses this. He's like extra buff and he knows a lot about taking vitamins and whatever else you take to stay in shape. He knows how to use this. He got a bigger jar than this. I'd say it's effective if he didn't stop using it. I think he'll buy it again.
I'm gotten very squarely in the gym every day and have recommended this product. I tried it and if it helps a lot to improve performance and physical condition. I have little to use it but so far so good