Wikipedia  is an excellent source of information. We often use it to research on countries, history, scientific problems, and languages.
Yes, it is an excellent source of information. But not on tongkat ali. The entry is just full of spam. Better search Google schoolar for more than 10,000 scientific articles on tongkat ali. The scientific name of the plant is Eurycoma longifolia. To discover tongkat ali scams or cheats, search these terms in normal Google.
If the topic is not tainted by commercial interests.
Once there are commercial interests, you can’t trust Wikipedia.
Take the search terms “tongkat ali” and “eurycoma longifolia” as example.
Malaysian tongkat ali traders are notorious for spaming Wikipedia. Their practices include:
* Renaming references to tongkat ali into references to their own products.
* Claims that there is a difference between Malaysian tongkat ali species and the tongkat ali species of other countries, suggesting some undefined benefits towards using Malaysian tongkat ali,  rather than Indonesian or Chinese tongkat ali.
* Claims that all the relevant tongkat ali research was done by Malay scientists, when in fact most were Chinese.
* The removal of references critical of Malaysian tongkat ali products, for example because of the heavy metal contamination of Malaysian tongkat ali  (which, indeed, has been pointed out by Malaysian scientists).
For all the above reasons, readers should consume Wikipedia information on tongkat ali with caution.
Wikipedia, the free encyclopedia
2 Abd-Elaziem Farouk, Asma Benafri, Antibacterial activity of Eurycoma longifolia Jack. A Malaysian medicinal plant, Saudi Medical Journal, Vol 28, No 9 (2007)
3 H.H. Ang, , K.L. Lee, Contamination of mercury in tongkat Ali hitam herbal preparations, Science Direct, Food and Chemical Toxicology
Volume 44, Issue 8, August 2006, Pages 1245-1250