Most of these products don't increase your free testosterone levels, they just return them to where they should be. This can also be done with correct training, diet, sleep etc
Things that work:
Tribulus - Works with some people, others it doesn't work. Try it for a few weeks and see if you notice a difference
D-Aspartic Acid - Again, like trib, this will not work for some people, although in a study against placebo, the average increase was 60% in free testosterone after 12 days dosed at 3g a day
That product is a very expensive way to buy tribulus. But it also contains flaxseed oil which has been shown to be anabolic by balancing your levels of omega-3. Again a very expensive way to buy oil... The rest of it are herbs and fillers, most of which have shown to increase libido but not testosterone!