Tongkat Ali or Pasak Bumi

Eurycoma longifolia Jack (a.k.a. Tongkat Ali or Pasak Bumi) is a flowering plant in the family Simaroubaceae, native to Indonesia and Malaysia. The author abbreviation Jack in the scientific name of the plant refers to the Scottish botanist William Jack.
Eurycoma longifolia Jack is a small evergreen treelet growing to 15 m (49 ft) tall, with spirally arranged, pinnate leaves 20-40 cm (8-16 inches) long with 13-41 leaflets. The flowers are dioecious, with male and female flowers on different trees; they are produced in large panicles, each flower with 5-6 very small petals. The fruit is green ripening dark red, 1-2 cm long and 0.5-1 cm broad.

Uses
Eurycoma longifolia has become popular for its alleged testosterone-enhancing properties. It has therefore been included in some herbal supplements for bodybuilders. Historically, South East Asia has utilised the herb for its suggested antimalarial, antipyretic, antiulcer, cytotoxic and aphrodisiac properties.
Some scientific studies suggest that it enhances sexual characteristics and performance in animals.[2][3][4] However, most of these studies were conducted by the same researchers, so more research is needed.
In other studies, fractions of Eurycoma longifolia Jack extract have been shown to induce apoptosis in breast-cancer cells[5] and to be cytotoxic to lung-cancer cells.[6]
The British Journal of Sports Medicine published the results of a scientific study in 2003, which showed that Eurycoma longifolia caused increased muscle strength and size when compared to a placebo.[7] This may demonstrate the anabolic properties of Tongkat Ali but again more research is needed. Some athletes and body builders now use Tongkat Ali extract in the hope that it will act as a testosterone-booster, to improve muscle size, strength, and performance without drugs.
This testosterone-enhancing herb can be used to build libido, as well as combating fatigue. Tongkat Ali has been shown in studies to increase testosterone levels in males up to 93%. In a study from the Reproductive Research Center in Kuala Lumpur, Malaysia, men between the ages of 31-52 regularly took Tongkat Ali. Results indicated increased testosterone levels; thus improving libido, energy as well as muscle mass. [8]
Tongkat ali is sold in various extract ratios, with 1:50, 1:100, and 1:200 being most common. It should be noted that a higher extract ratio does not necessarily mean that an extract is more potent. At a higher extraction ratio, some of the active ingredients may even be lost, as the focus if often reflective of a pursuit of patent rights than achieving efficacious end product.
On the other hand, some products on the market do not state any specific extract ratio, and then it may be anything between 1:2 and 1:10. Furthermore, buyers should be aware that tongkat ali is one of the most expensive herbals sold internationally. Thus, capsules or tablets that combine tongkat ali with other ingredients and do not indicate definite quantities of each ingredient may contain just minuscule amounts of tongkat ali. The market demand for Tongkat Ali is growing, and even though plantations are being created every year, demand still outweighs supplies. Trees in their native habitat are rather scarce, and are further endangered by the common practice of wild harvesting.........From Wikipedia, the free encyclopedia