Tongkat ali does take some time to start working so it may take up to 2 weeks before you start to see its effects. You also need to make sure you are getting an extract of the root powder and not just root powder. The extract is more expensive, but necessary. 8 out of 10 stars!
Yohimbe – Yohimbe has been used as a testosterone booster as well as a fat loss aid. While it does aid in fat loss through several mechanisms, there is no proof that it boosts testosterone levels.
It is likely that people believe it increases testosterone because it does increase libido, however the libido increase is not due to a testosterone increase. Yohimbe works partially as a vasodialator which means it opens up blood vessels, especially those in the lower extremeties such as the genetalia.
Yohimbe has also been shown to have several negative and possibly dangerous side effects and many physicians advise their patients not to take yohimbe because of these side effects. 3 out of 10 stars!