Hi, I personally tried a lot of different ones and settled on Turkesterone. It's a very good quality supplement. Here's an article about it https://valhallavitalityshop.com/blogs/news/turkesterone-supplements-for-bodybuilding-routines-exercises-results . When it comes to its structure, it seems very similar to a human hormone called testosterone. Because of its obvious structural similarity, it is much closer to testosterone in its properties.