They are different...they dont effect hormone levels in the body except free test usually. Basically you have two test levels in the body Total test and free test. So a normal person might have like (arbitrary numbers and percents) 100 Total and 50 Free. Test boosters usually work I think by increasing free test to say like 65 or 70 but dont effect other hormones in the body. Im not 100% clear exactly how it works exactly but if you wanted to do more research thats the basis I think. Also they are obv a lot weaker at increasing test than say...injectable test or other steroids
-Mike