The brand I like best Sopharma Bulgarian Tribestan. The funny thing is when you read the ten page adds in the mucle mags they all compair thier tribulus to bulgarian. Twin labs was ok but I got more out of the Sopharma Tribestan. It cost about $23-$30 for a box of sixty tabs. You need to take two tabs three times daily. It is a little expensive for a thirty day supply (about $75). But it is worth it.