You are encouraged to search on your own to see which products work and which don't.
This page is a comprehensive and up to date review of the most commonly recommended testosterone supplements, from an academic physician. It's updated monthly. It's not a list of the most effective products, but it's a listing of products that are highly recommended and have been shown to help significantly. It's been tested by multiple doctors for reliability and has been reviewed by the FDA and published in peer-reviewed journals. It's been reviewed by thousands of other physicians and the results have been published. Many of these products contain ingredients that are legal in all 50 states and some contain no legal ingredients at all. Some products contain other ingredients, ingredients that were not on the label. Some products contain chemicals that are unknown in nature or illegal. Some products are not even recommended for the condition they claim to treat.
If you have severe acne, you should not buy testosterone products, or any other skin care products. These products are full of irritants, chemicals, and ingredients that make your skin worse, not better.