Long Jack root supplements may be useful for supporting male sexual function. Long jack is a common name for supplements derived from the plant Eurycoma longifolia, a shrub-like tree indigenous to Southeast Asia.
It is called pasak bumi in Indonesia and tongkat ali in Malaysia, the two countries that produce most of the world’s long jack supplements. The roots and bark of the plant have been used as an aphrodisiac for centuries by indigenous populations and were also prized for their antibacterial, antiviral, antimalarial and antipyretic properties.
The plant remains so popular in Malaysia that it is classified as a protected species to help preserve the native population. In that country E. longifolia is cultivated as a crop and is harvested to provide the bark and roots that are sold around the world.
Contemporary investigation of long jack indicates the plant and its constituents may be useful in improving symptoms of sexual dysfunction. According to Long Jack reviews, it is also used by strength-training athletes, such as weightlifters, because it is thought to increase testosterone, energy and human growth hormone.



- Aphrodisiac & male sexual enhancer
- Increases testosterone & sperm motility
- Improves muscle mass, strength & mood
Long Jack Review
Long jack has been used for centuries as a general health elixir in Indonesia, Malaysia, Vietnam, Thailand, Cambodia, Laos and Singapore.
It continues to be used now for a range of conditions and purposes, including as an ingredient in energy drinks.
Uses of E. longifolia have expanded beyond traditional. User reviews show that it is commonly taken to improve athletic performance, increase sex drive, improve mood and raise mental energy levels.
A small number of clinical trials indicate Long Jack may be useful in treating some symptoms of sexual dysfunction and increasing muscle mass in conjunction with strenuous workouts.
But the majority of its other uses remain unsubstantiated due to a lack of clinical research. Research is currently ongoing to address Long Jack’s ability to:
- Enhance the body’s ability to break down and assimilate lipids, leading to a decrease in LDL cholesterol and triglyceride levels;
- Reverse infertility, especially in men;
- Protect against malaria;
- Manage and treat the symptoms of type II diabetes mellitus;
- Alleviate symptoms of heart disease, kidney disease and liver disease;
- Restore poor memory and enhance mental performance;
- Alleviate the symptoms associated with CFS (chronic fatigue syndrome) and anemia.
Long Jack Root for Erectile Dysfunction
Medications currently marketed for erectile dysfunction contain a synthetic compound that helps a man achieve erection. This active compound acts as a phosphodiesterase type 5 (PDE5) inhibitor.
PDE5 can prevent erections by shutting down the pathway for blood to enter the penile shaft. Specifically, PDE5 works to block blood from entering the corpus cavernosum of the penis, the two tubular formations of erectile tissue inside the shaft.
PDE5 inhibitors neutralize the effects of PDE5, and thus allow blood to enter the corpus cavernosum and achieve an erection.
Many prefer natural PDE5 inhibitors because they are claimed to have fewer side effects and carry the added benefit of acting as an aphrodisiac. Long Jack may act as a PDE5 inhibitor when administered in large dosages. However, this effect is not as reliable compared to Horny Goat Weed.
Further investigation is required to understand Long Jack effects, but it has been observed to increase both sperm quality and quantity in some studies. Additionally, it has been observed in animal tests to support erectile function in combination with a number of other herbs.
Long Jack Supplement Safety
Side effects of Long Jack supplementation may include restlessness, insomnia and anxiety. Some user reviews have noted that taking the supplement earlier in the day helps ward off potential sleep disturbances.
Long Jack supplements are often not standardized for active ingredients, so it is important to follow instructions provided by the manufacturer with regard to dosing. Some opt to start taking this product at a low initial dose and slowly increase to the recommended dosage over the course of several days, or even weeks.
It is important to buy Long Jack supplements from reputable manufacturers who sell quality products. Some Long Jack supplements have been found to not contain any E. longifolia and others have been found to contain harmful compounds, such as lead and pharmaceuticals.
A new assay has been developed that helps detect quassinoids – a class of compounds contained in E. longifolia. Looking for the level of quassinoids listed on the supplement may help distinguish a higher-quality product from a lower-quality product.
Research into the effects of Long Jack is still in its infancy. The full side-effect profile of E. longifolia remains ill-defined. As it may have a number of affects on the human body, Long Jack may interact with a number of prescription and over-the-counter medications.
In addition, supplementation is not suitable for a number of groups, including: pregnant and nursing women; individuals suffering from hormone-sensitive cancers; individuals who have recently suffered a heart attack; and those who have an upcoming surgery.
It is important to speak to your doctor before taking Long Jack pills or capsules to make sure the supplement is right for you. Your primary healthcare provider will be able to assess the scientific reviews of Long Jack to see if the supplement will safely meet your needs.
- Hamzah S and A Yusof. The ergogenic effects of Eurycoma longifolia Jack: a pilot study. British Journal of Sports Medicine 2003;37(5):465-466.
- Tambi MI, Imran MK, Henkel RR. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia. 2012 May;44 Suppl 1:226-30.
- Chan KL, Low BS, Teh CH, Das PK. The effect of Eurycoma longifolia on sperm quality of male rats. Nat Prod Commun. 2009 Oct;4(10):1331-6.
Article last updated on: March 31st, 2018 by Nootriment