I don't have any definitive proof that it's working, but it feels great when I drink it and I am feeling more lean. The taste def grows on you. The first time a drank it I didn't enjoy the taste much, but now my body seems to crave it and it tastes like a delicious fruit punch to me. Make sure you take it with cold water and refrigerate the Fortagen because it taste so much better that way. I have only been taking it about 15 days so far so I can't really comment on anything long term.