I am reviewing only testosterone products that contain no other steroids or any other drug. All products I review have been tested in animal models.
The testing that I have done for most products on this page has been on lab animals. I have used in vitro assays (using blood from animals, usually mice and rabbits) and in vivo assays (using tissue and blood from animals). I don't have the time to do all of the lab work for each product, so I usually only do in vitro assays. This does not mean that I have not tested any product on animals. I've done tests on mice and rabbits (or other animals, not necessarily lab animals) to check the effectiveness of various testosterone products in humans.
I have had good experiences with these products. It would be best if I could describe them, but I don't think it's necessary to say anything other than that. I don't know if the products I've tried are the most effective, or even the best, but they have been very useful to me. I don't know anything about the safety of these products.
Here is the list of the top 5 products that I believe work well for men.