Most of these products are from the testosterone manufacturer's site. There are many other testosterone supplements that have different ingredients. If a product has only one ingredient, then that is the best option. If there are multiple ingredients, then I am rating the product by overall effectiveness.
When it comes to testosterone, it is important to note that some companies have changed their products and they have a different name. In addition, some companies offer multiple versions of the same testosterone product. For example, some testosterone boosters come with a 10% and a 20% T (and sometimes it is called a T20, T20, T20-30 or something else). This is because testosterone boosters are designed to be used with different levels of testosterone. Also, some testosterone boosters contain other ingredients, such as vitamins, minerals and amino acids. All of these things will influence how well the product works. For example, a T20-30 might have more of an effect on muscle recovery, while a 10% T20 might have a more potent effect on muscle growth. In addition, some supplements will work for one person and not for others. I suggest you start with a trial size of just one or two months before making your decision to buy a testosterone booster. The most effective T supplements can be found in the medical supply section of any drugstore.