Tongkat Ali is a Potential Testosterone Booster and Estrogen Blocker

Eurycoma Longifolia (Tongkat Ali, Pasak Bumi). The name gets thrown around when people start talking about testosterone boosters or aphrodisiac herbs…

However, in my opinion Tongkat Ali is not exactly the best testosterone booster out there.

…It might be one of the most popular one’s, but the evidence of it boosting testosterone just isn’t clear enough for me. It seems to increase testosterone levels in rats, stressed humans, and humans with low testosterone, but no studies have ever examined it’s effects on healthy non-stressed non-infertile males.

Here’s what I’m talking about:

Tongkat Ali as a Potential Testosterone Booster

Tongkat ali testosterone supplementTongkat Ali is a flowering plant native to Indonesia, Malaysia.

The active ingredients claimed to increase testosterone include steroidal saponins and eurycomanone. There’s also some aphrodisiac pro-erectile compounds in the herb such as Canthin-6-one metabolites and derivatives of Squalene.

Tongkat Ali has a huge reputation as a pro-erectile testosterone booster and if you’ve been reading any of the men’s health sites of the 20th century, you’ve had to stumble upon the herb few times by now…

But I have a hard time buying all the claims about Tongkat Ali, and quite frankly the market seems to be full of fake products and extracts which are nowhere near the actual herb.

Other things aside, let’s see what the actual science says about this herb:

a) The researchers at this randomized double-blind placebo study had 109 men as their test subjects. They gave half of these men 300 mg’s of freeze dried Tongkat Ali extract, and the other half got placebo. The abstract cites that the study went on for 6+ months.

The results showed that after 12 weeks there was significant increases in semen motility (+44%) and volume (+18%) in the Tongkat Ali Group. The test group also had significantly higher scores in the Erectile Function domain in (IIEF) questionnaire and noted significant improvements in libido when compared to the placebo group.

b) In this peer-reviewed study that appeared in the Journal of the International Society of Sports Nutrition 2013, the researchers had 62 moderately stressed subjects.

They gave half of their subjects a standardized hot-water extract of Tongkat Ali for the duration of 4 weeks, and the other half received a placebo.

The results showed that in the Tongkat Ali group there was significant improvements in tension (-11%), anger (-12%), confusion (-15%), cortisol (-16%), and testosterone (+37%).

Albeit this is the most promising study about Tongkat Ali so far, the effects would still need to be studied more on healthy men with no stress.

c) This study had 76 male subjects who suffered from late onset hypogonadism (low testosterone). The researchers gave these men 200 mg of a standardised water-soluble extract of Tongkat Ali for the period of 1 month.

The results showed a staggering 46% increase in total testosterone levels and remarkably 90,1% of the subjects were able to normalize their testosterone levels back inside the reference range.

However this study didn’t have a control group, and all the men had low testosterone levels to begin with. Which means that the effects are probably not similar in men with normal to high testosterone levels.

d) Aside from the human studies, one in-vitro study has shown anti-estrogenic effects in Tongkat Ali. For example, this study found out that it blocked estrogen more effectively in a petri dish than tamoxifen (a popular synthetic estrogen-blocker).

However it’s an in-vitro study, which means that the effects may not take place inside the human body. More studies on humans would be needed to validate those claims, but the results are fascinating to say the least.

e) Animal studies seem to show that Tongkat Ali has a pro-erectile testosterone boosting effect on rats (study, study, study).


The takeaway from the human and animal studies seems to be that Tongkat Ali is a potential testosterone booster that works wonders in men with low testosterone, and men who are battling with “moderate stress”. It was also seen to reduce cortisol levels (the stress hormone) in stressed subjects and it blocked estrogen inside a petri dish.

However none of the studies so far have examined Tonkgat Ali’s effects on the hormonal profiles of healthy males, and that definitely leaves a big hole in the scientific matrix of the herb…

So take it with a grain of salt, you might benefit from the herb if you’re under stress or have low testosterone levels to begin with, but there’s no evidence of it boosting testosterone in healthy men.

And like I said, the market is jam-packed with snake oil salesmen who cash in with products that probably have nothing to do with the actual Tongkat Ali…

…The best quality high-potency Tongkat Ali comes from Indonesia, from the original Sumatra Pasak Bumi company (affiliate link).

Tongkat Ali is a Potential Testosterone Booster and Estrogen Blocker was last modified: January 25th, 2018 by Ali Kuoppala

Ali Kuoppala

Ali Kuoppala is the founder of Anabolic Men, and an Independent Researcher that has been credited with organizing the findings that have helped thousands of men reach hormonal balance.
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  1. john on 27/12/2014 at 18:46

    Hi Ali,

    Im thinking about starting implementing your recommendation from “The secret that doubles testosterone”. Im having however difficulties with getting an ATP Cofactor in England (i cant really afford to buy it from American Amazon).Im wondering if i could use niacin and riboflavin instead ?Or perhaps there is something else in this this supplement that im not aware of .Thanks ,John

    • Ali Kuoppala on 30/12/2014 at 21:45

      I think those vitamins are what’s in ATP cofactor caps. I have also tried searching for alternatives as there’s no caplets for sale in Finland. But I’m not even sure myself what’s in them. They’re just always recommended with iodine, and that’s why I’ve included them into the program.

      • john on 01/01/2015 at 19:11

        thanks man!!!

  2. tom on 18/01/2015 at 00:59

    This stuff works. Im more daring and agressive on the daysi use this when i think back. It isn’t even a small change its pretty obvious. This picture sums up how it makes me act. I use source naturals lj100 in case anyone is curious

  3. tom on 18/01/2015 at 01:02

    Its not placebro either its only t booster i use that has this effect. The others help in other ways.

    • Tom Ubl on 07/04/2015 at 16:48

      Are you cycling off and on and to what kind of a schedule? What are your E2, Free T, total T and SHBG levels?

    • bahadur on 01/05/2015 at 02:06

      It is actually so effective, i thought i took steriod.. i took tongkat ali at morning and felt huge increase in strength, got boner, deep voice, etc.. i was scared lol… but only cons was that i could’nt sleep at night…

  4. Jonathan on 11/01/2016 at 23:20


    How do you know that the 2 brands recommended are legit?

    I have read through a bunch of forums… a lot say that the sumatra pasak bumi brand is the only one harvested from the right area and not ever fake… they have certified resellers listed on a site, and seem to be trusted.

    As for the bulk supplements and pure science supplements… they very clearly give free product for reviews/pay for reviews/write a bunch of positive reviews themselves. They have an absurd amount of reviews on amazon… which seems very sketchy to me. And they both have plenty of reviews saying that the product is not legit in one way or the other.

    I am just having a hard time figuring out which opinion to trust. Any guidance?

  5. Adam on 26/01/2016 at 22:28

    Super Man Herbs has the best Tongkat Ali out there, hands down.

  6. […] Tongkat Ali knows as Malaysian ginseng or Eurycoma Longifolia Jack. The root contains compounds that have repeatedly been shown in animal studies to stimulate libido, promote semen quality, and even support muscle growth. […]

  7. Wasim Wazir on 09/03/2016 at 16:54

    tongkat ali is better than ashgawanda and pine pollen as i have tried all 3!i have noticed my body works great with tongkat ali

  8. Becca on 13/07/2016 at 23:38

    Any input regarding its use in women? I haven’t spent hours looking, but a cursory search on the process by which it may increase testosterone has resulted in nil. Obviously, if the increase in testosterone is believed to come by way of the testes, it will do me no good.

  9. Becca on 14/07/2016 at 00:07

    I found some info. It works by way of boosting the number of Leydig cells, found in the testes AND ovaries, which produces test. Tongkat ali also affects the hormone SHGB, that binds to and makes testosterone ineffective. It somehow releases the testosterone from the SHGB bind, allowing the body to utilize more testosterone. I won’t be taking this substance because there’s an ovarian tumor (Sertoli-Leydig) comprised of Leydig and Sertoli cells.

    **I know this site is called Anabolic Men, but there isn’t exactly an overload of websites catering to women interested in the topic. Thanks for all the info. 🙂

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