Some companies make products to promote testosterone and don't make other products. For example, some testosterone pills don't contain the synthetic testosterone that's necessary to keep your testosterone levels under control. If you take testosterone without a prescription or for self-treatment, it's important to check with your doctor first to make sure that your health plan or insurance plan includes the prescription or self-treatment testosterone. One company I am reviewing has a testosterone-prescription and is in the top-five on Amazon for testosterone, and it's made with all natural ingredients. I will be reviewing that one. I will not be reviewing other testosterone products or products that are "bulk" or "packaged" in a way that doesn't look natural or that don't have testosterone products in them, for example, a box with testosterone and a bottle that looks just like a bottle of water with a small label on it that says "Bulk Formula". Many companies will sell you a testosterone product for just $2-3, but not a bottle, and not a large quantity, but not enough for a good product. I have also reviewed a testosterone booster that is sold as a "vitreous injection". There are two things wrong with this product: 1) the manufacturer does not make any claim about whether the testosterone in it is from animal sources or not, or 2) if it is, it says it only contains synthetic testosterone.