I've tried several Test Boosters. I always stack my test boosters with Kre-Alkalyn and Multivitamins. So far, EVLTEST has shown me the best results. I was very impressed and just bought 2 more bottles. I cycle them, 2 months on, 1 month off and it seems to be working great. I've noticed gains in my strength, but I've always noticed my size was increasing as well. I'm sure products work differently for everybody depending on how your body responds, but I can confirm that stacking the EVLTEST with my Kre-Alkalyn and multi is working great for me right now. Hope this helps!