I recently completed 5 weeks of Tropinol as a standalone product. I began the first week at 3 tabs/day and went to 2 tabs/day the second week, then back to 3 tabs/day for the rest of the cycle. I decided to stop, even though I have about 3/4 of a bottle left, due to concerns about negative effects on the liver and kidneys. I "call them as I see them "and this product did absolutely nothing in the way of recomp or increases in muscle mass. In fact I think that I actually lost size and strength on this product. There was no indication of any kind that my test levels had increased. Thus far the best natty stack I have found is Triazole and Activate XT. This stack is not "earth shaking" but it seems to work as well or better than any other natty stack I have tried to-date.