I purchased endothil cr after much research. I found that the people who followed the simple instructions, work one body part per day to exhaustion were the ones who noticed results. I'm 52, I've noticed a significant increase in muscle density, strength and endurance. My recovery time is much faster and I am able to have more intense workouts.
The key is to follow their workout program and not do a whole body workout.
This is really for people who are serious about training and the discipline it takes to do just on body part at at time. In the three weeks I have been taking this, I have seen a 20% increase in amount of weight I can lift or push as well as the number of reps. There is a much better quality to the muscle I have developed. All in all, this is for the serious athelete. Highly recommend, I will be ordering again. Besides,
they say it takes about 8 weeks for a supplement to really do what it is going to do when it do what it do.
4 stars

This product works...when you know what you're doin...first off working to failure means FAILURE!!! it means you need to work till your muscles give out on you...not till you're tired....but when your muscles literally cant push....and someone has to help you through the last rep or two. Then it works.. the problem is that not everyone wants to work out that way. However if you follow that plan it will work..I used to work at a supplement store and anyone I recommended this product to that worked hard enough got results. The thing is the results varied...some people got mass and some got density...I myself got density and shorter recovery time. I would recommend it if you're willing to work out that hard 4 to 5 times a week. 4 stars

I am a competitive cyclist. I did my hill intervals and sprints at max heart rate and saw results. I had my fastest 10 mile time trial time in 3 years! My biceps and triceps got bigger in the first couple months. You have to push to MMF (Momentary Muscle Failure)or you won't see results. Creatine make endurance athletes cramp because of water retention, this stuff doesn't. 5 stars

I took this stuff for a full 30 days while I followed the workout program that it gives you with absolutely no benefit at all. Spend the money on taking you vitamins and buying protein instead since just like anything else, you have to work at it. 1 star

Great product. Works, and actually does what it says. Little pricey. Taste isn't as bad as some people have said. So far (1.5 months) this product has help me increase energy and muscle quicker then normal. Recommended to anyone that wants to build lean muscle mass. 4 stars