Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
How Tongkat Ali boosts testosterone levels
Researchers at the Universiti Sains Malaysia have worked out how extracts of Eurycoma longifolia - a plant you probably know by the name Tongkat Ali - boost testosterone levels. Tongkat Ali extracts contain the compounds eurycomanone and 13-alpha-(21)-epoxy-eurycomanone, and these boost the production of the hormones LH and FSH.
The researchers discovered that one of the fractions increased the weight of the testes of the lab animals more than the others. This was the extract that consisted of 32 percent quassinoids. The two most important of these were eurycomanone and 13-alpha-(21)-epoxy-eurycomanone.
When the researchers gave their lab rats the Eurycoma longifolia quassinoids separately, both eurycomanone and 13-alpha-(21)-epoxy-eurycomanone boosted the rats' testosterone levels.