I always use the lj100 by source naturals. They use high quality lj from herbal powers. I just bought two 60 count bottles at $24 a piece. Ive used lj100 a few times in the past as well as clomid, nolva, etc. and I can tell you this stiff IS legit! Id think most people could use this stuff, and have no need for HRT and all the negatives it entails. In my experience lj100 is every bit as potent as clomid was for me. It makes my nuts swell up to almost twice their size, and I feel like Im on a low dose steroid cycle....like Im 17 again lol! You do need to cycle it though, and I try and keep my test levels noticeably higher, without going over board. This time Im doing 3 days on, 1 or 2 days off, for 4-6 wks or so. The only TKA I've tried is the lj100 stuff, so I cant comment on the other potencys. Its always worked so well for me, I just cant find a reason to try anything else....to sumarize, I say go for it!