TweetSupposed to be, considered, blah blah blah, the best trib.
IMHO, more concerned with getting a properly dosed capsule per say.
I tried Tribestan once, which is considered the best, and don't know why yet got no response that was noticeable from it.
My preference is for most inexpensive name brand, thus most of time I just buy Twinlabs, I've tried Bio-Test, Tribestan, AST, and a few off brands.
Twinlabs overall most cost effective and effective. AST was good yet about 35% higher priced.
Again, just my experience.
Good Luck