Does Tribulus Terrestris Increase Testosterone Levels? Science Says…

Tribulus Terrestris and Testosterone

I remember sitting on the toilet one day while I was doing a marketing internship in my college days.

It was a REALLY nice place I was doing the internship at; they even had reading material in the bathroom.

Oh yeah, and they paid me nothing… and abused my free help, and didn’t teach me anything (note to college students: make sure an internship is not an employer just trying to get a free employee). I was out of there in a couple weeks. BUT… that’s besides the point.

Back to the bathroom.

They had a stack of interesting Men’s Health magazines, and I picked up one of them, forgot which one, and it had an article on Tribulus Terrestris. The article spoke matter-of-factly about the testosterone-increasing and erection strengthening properties of Tribulus Terrestris, and provided some sort of study to support this.

So me, like most young men with raging testosterone levels, somehow worried about my testosterone levels. Who. Knows. Why.

I went to GNC, picked up a bottle of Tribulus Terrestris caplets, and took it home.

I took the recommended dosage, and began “experiencing” rock hard erections and a raging sex drive. I lifted “more” in the gym. My testosterone levels were “obviously” much higher…

But thinking back now, years later… Was it all in my head?

Now, light years beyond the naive intern, and now a seasoned sexual research vet, I look to almighty science for the truth. Not Men’s Health, bathroom edition.

What Science Says About Whether Or Not Tribulus Terrestris Increases Testosterone Levels

In a recent study published in the Journal of Ethnopharmacology, they discuss how the popularity of medicinal products from Tribulus Terrestris is expanding at a quick pace due to consumers trying to naturally increase their testosterone production. However, reliable and conclusive scientific evidence is lacking on its actual ability to increase testosterone production.

An increase in erectile function has been associated with Tribulus use, but seeing that it was due to an increase in testosterone, is yet to be proven.

The aim of the study is to closely analyze evidence that Tribulus Terrestris can actually increase testosterone levels.

An extensive review of all studies and literature related to Tribulus Terrestris from 1968 to 2015 was carried out on all the following major scientific databases:

  • PubMed
  • Elsevier
  • Springer Link
  • Google Scholar
  • Medline Plus
  • Web of Science

As well as all references found in the literature that was related to Tribulus Terrestris.

After analyzing all of the studies in humans and animals, it was pretty much a given that Tribulus is helpful for treating erectile dysfunction; however, observational evidence to support the hypothesis that this is due to a boost in T levels is at best, inconclusive, at worst, outright wrong.

While the reason for Tribulus Terrestris functioning as such a good natural ED treatment and aphrodisiac is unknown for the most part, there is compelling evidence from studies in animals that there may be a nitric-oxide boosting property to the Tribulus, much like how Viagra functions.

So is there a definite answer? No. But if you’re looking for natural ways to increase your testosterone levels, Tribulus Terrestris is most likely not the way to go.

Natural Ways To Increase Testosterone Levels That Actually Do Work

Just because Tribulus Terrestris isn’t the miracle testosterone solution, you have plenty of other natural ways to keep your T levels up, backed by science.

Up your Vitamin D intake — Vitamin D deficiency is tied to low testosterone. Drink milk, get some sunlight.

Keep your cell phone out of your pocket — testosterone levels have been found to be reduced when close to cell phone waves for too long.

Eat red grapes — the skins of red grapes contain resveratrol, a proven aromatase inhibitor. Aromatase is an enzyme that converts testosterone into estrogen. Keep your T levels from converting to the other side!

There are MANY natural things you can do to increase your testosterone production, see more ways here…

Have a good one!

-David Carreras aka Mr. Manpower
Mr. Manpower’s Guide to
Overall Manhood Enhancement
The Ultimate Sex Guide for Men… “male potency without drugs”

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Failing At The Male Multiple Orgasm (MMO)? Here’s Why

how to stay hard after comingThe male multiple orgasm technique (MMO) is an awesome move to have down pat during sex.

Tough part is, having it down pat.

For the longest time, I had a problem performing this technique… I’d generally have one of the two following things happen when going for the male multiple orgasm:

  • Have a dry orgasm, but not cut off the ejaculation (internally) all the way, causing me to have a retrograde ejaculation and still lose my erection, or
  • Have a dry orgasm, and then IMMEDIATELY have a followup orgasm, that I couldn’t control / block off the ejaculation

Both of these outcomes lead to me not only failing at the technique, but also ejaculating, a not so enjoyable orgasm (shoot, I would have rather been masturbating full speed towards orgasm while watching a porn, or having rough sex with a girl… not wasting it alone in a room with no mental stimulation).

And at the time — and still somewhat to this day — I held the Taoist belief that saving up semen is important for my strength and masculine power (science actually supports this, too – saving up ejaculation builds up testosterone).

So That Caused a Failed Male Multiple Orgasm Attempt to Be All the Worse…

So I gave up on it altogether for a long time.

Why give it a shot, I thought, when I had failed so many times and wasted so much semen, without even getting anything back from it. My confidence in the technique was very low.

But then my persistent premature ejaculation caused me to continue looking for a solution to last longer during sex… one that didn’t include numbing sprays (that would rub off on the girl, and make her feel nothing as well) or antidepressants (that delay ejaculation, but can kill your libido and energy).

So I began to gain interest in male multiple orgasms again…

But this time, I wasn’t going to try the technique until I had AS MUCH information down as possible.

I went through ALL of the information I could find on the male multiple orgasm technique, both online, and in print.  I read, and read, and read… while many places had information on this so-called MMO, there were many different ideas on what the technique really was.

  • Some considered it a whole body, energy orgasm… which sounded too “airy” and spiritual for me – I like more concrete ideas, and doubted I’d ever be able to pull this off.
  • Others spoke about some sort of perineum (your “chode” or “taint” area) massage that would yield countless orgasms with ejaculation- besides the fact that I didn’t want to ejaculate so damn much, what good would his do for overcoming premature ejaculation?

When finally gathering info ONLY on the actual, dry orgasm, male multiple technique I was going for, I picked up things here and there, and formed a plan of attack.

I wasn’t going to try until I was ready…

And for some reason, I felt like I had A LOT on the line… if I would have failed on this attempt, I don’t know why, but I most likely would have NEVER tried it again… even after all the preparation… I put heavy stakes on myself (too heavy…)

Finally Performing The Male Multiple Orgasm – Joy, Pride and Power…

I had absorbed a substantial amount of information the technique… how to properly strengthen the PC muscle, when to clamp down, how long and hard to hold that squeeze, and a few other important preparations, and things to do at the point that I was supposed to perform the technique.

I had the apartment to myself (had a roommate at the time, who was at work), and put on a porn. Not sure why I chose to do it with such strong mental and visual stimulation as pornography, but it was part of my plan at the time.

I slowly built up arousal, and let it subside.. build up a little higher… let it subside… after a few more physical and mental preparations, I went for it.

Clamped at the perfect time near orgasm, had a dry orgasm, cut off all the ejaculation, and stayed rock hard… all while watching an incredibly sexy, big-breasted chick stripping down…

The coolest part to me was how hard my erection was still after this dry orgasm… I went to the kitchen, got me a cup of water, and was still rock hard… and felt like I hadn’t even orgasmed yet… still keeping my mind horny after orgasm as well.


Then I went back to my porn vixen and worked my way up to a next orgasm, repeated the process… dry, orgasmic contractions… penis still rock hard… continued on with hard erection after orgasm….


I finally let go with an ejaculation at the third orgasm… I deserved it.

From then on, I went on to increase the amount of times I was able to stay hard after orgasm, and began using the technique during sex…

If you would like to learn everything I know about how to perform the male multiple orgasm, so that you can master the technique to the point you can actually use it during orgasm, check out my guide to MMOs, here…

Male Multiple Orgasms is one chapter of Mr. Manpower’s Guide To Overall Manhood Enhancement, for download, here…

The most comprehensive guide to MMOs around… read this, and you’ll save yourself tons of time and avoid the pitfalls that generally happen when attempting the technique.

Have a good one!!!

-David Carreras aka Mr. Manpower
Mr. Manpower’s Guide to
Overall Manhood Enhancement
The Ultimate Sex Guide for Men… “male potency without drugs”

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Science Supporting Natural Penis Enlargement – Studies, etc.

penis enlargement studiesPenis enlargement is synonymous with the word “scam”.

Seems like the two go hand-in-hand in most people’s minds.

However, although male enhancement pills make ridiculous, untruthful claims, manual penis enlargement exercises DO work.

I’ve increased my penis size with the manual techniques, as have the men I learned PE from, as have the thousands of men who’ve read my guide. So I, for one, know it works… but it’s been a LONG time, and science still hasn’t done any large scale studies on manual penis enlargement techniques.

And if you were to go to your doctor and ask him “Hey Doc, can I make my penis bigger with these exercises?”

Without a doubt, you’ll get a warning to stay away… this is due to a doctor’s fears of being liable for some damage, and receiving a malpractice suit. It’s due to ignorance, but it’s not their faults… science hasn’t been too adamant about studying this stuff.

(Funny note, I know a couple of doctors who actually do penis enlargement themselves, including one man who was in his 70’s and loved the exercises due to the massive flaccid hang it gave them. He’d brag about being the biggest in the nude beaches he’d frequent).

However, when it comes to science supporting penis enlargement, there are some studies and surveys out there that support our cause…

Survey of 545 Men And Their Natural Penis Enlargement Results

Back in 2008, a survey of 545 men was carried out on the now defunct

While the site is no longer up, I came across this study back then, and wrote down the findings in my notes:

  • Top gainers were able to gain 1 inch in length and half an inch in extra girth in 3 months of performing the exercises
  • Out of the 545 men, only 7 felt that penis enlargement exercises did not work
  • Men who ejaculated less gained more
  • The majority of men experienced stronger and harder erections
  • The amount of time put in correlated to gains made

While surveys are not without their flaws, and this would been better in a more controlled setting, seeing repeating results in a large group is indeed strong anecdotal evidence.

Study Showing Penis Enlargement Is Possible with Extension Device

In a 2011 study published in the Journal Of Sexual Medicine, after 3 months of wearing an extension device for several hours a day, men showed a permanent increase in flaccid penis size of 1.7 centimeters (0.66 of an inch), and a permanent increase in erect size of the same increase (1.7 centimeters or 0.66 of an inch).

Interesting thing was the glans (penis head) showed a slight increase in size, as well.

A 2009 study published in the British Journal of Urology had similar findings, only with a larger flaccid gain of nearly an inch at the end of the study period.

The results of these studies show that the enlargement of the penis is possible, but in my option, due to the results after so much hard work, I find extension devices to be a terrible penis enlargement method.

Half an inch in all those hours of work? Not worth it…

With manual stretches, you can add more force to the tunica and ligaments, and pull in different directions, which is very important. Also, jelqing and other exercises work to increase girth as well, and extension / traction devices lack in that area.

Study On Heat And Elongation Of Collagenous Tissue

penis enlargement studyWhile not a penis, this study shows some interesting effect on how heat, and applying force, leads to permanent elongation of collagenous tissue (using rat tails as the tissue). Our penis is made up of collagenous tissue.

From the study:

“The data showed that the low force, long duration procedure was very effective at producing residual elongation. Elevating tissue temperature and maintaining it prior to applying force was found to cause significantly less damage; and finally, the lower loads applied at elevated temperatures for prolonged periods were found to produce significantly greater residual elongation.”

Before you freak out at the word damage, just know, when you are lifting weights, you are “damaging” your muscles, and they heal in a larger state.

While the mechanism in enlarging penis tissue is slightly different, it does involve a “breaking” down of the tissue at a micro level (painless /actually feels good), and as the survey showed (and I’ve personally seen), penis enlargement techniques greatly improve erectile duration and hardness.

This also shows the importance of warming up before (and during) your penis enlargement exercises… it’s not just for injury prevention, but actually leads to greater gains.

Photo Evidence That Natural Penis Enlargement Works

One of the strongest pieces of evidence for me are before-and-after photos showing the results men have gained with penis enlargement.

Anecdotal evidence is one thing… scientific findings in a controlled setting, without visual evidence, can be questioned, based on the motive of the group conducting the study.

But SEEING, with your own eyes, a penis that has been enlarged, is powerful proof that penis enlargement works.

And I’m not talking about a half inch gain here… I’m talking about some pretty serious gains, both in length and girth.

Men who’ve read my guide have sent me before-and-after photos showing the gains they made, and I’ve collected them all on one .pdf file.

I won’t post them on my site, as having a bunch of penises on my site may confuse Google as to what my site is really about. To see these photos, shoot me an email to with “Photo Proof” in the subject line, and I’ll reply with the .pdf attached.


I know the scientific findings leave something to be desired.

There needs to be a larger scale study on penis enlargement methods in a controlled environment, by an unbiased, and highly reputable group.  Then things may change, doctors may begin recommending penis enlargement exercises, and the term “penis enlargement” will no longer have such a negative connotation.

As for now, while there is some scientific backing, penis enlargement requires a leap of faith more than anything. Warm up, don’t overdo it, and you won’t injure yourself… your penis is FAR more resilient than you think it is.

Once you see you are measurably larger, the doubt will be removed from your mind.

Tried Penis Enlargement Before? Or Interested In Trying It?

If you’ve tried penis enlargement, and haven’t seen results, or would like to try for the first time, I can guide you to the PROPER way to do penis enlargement I’ve learned over the years… click here if interested.

Have a good one!!

-David Carreras aka Mr. Manpower
Mr. Manpower’s Guide to
Overall Manhood Enhancement
The Ultimate Sex Guide for Men… “male potency without drugs”

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BELIEVING You Can Last Longer During Sex Helps Overcome PE

How to overcome PE on your own

The power of the mind is an amazing thing, especially when it comes to your sexual performance.

A study found in the British Journal of Urology shows that just by believing you are being treated for your premature ejaculation, you will actually be able to better delay ejaculation and last longer during sex.

In the study, 2,614 men were given Dapoxetine — an SSRI that can be given on-demand to help delay ejaculation — or placebo, a “sugar pill” if you will, that has no medical effect.

The men were asked to describe their premature ejaculation throughout the treatment, and its effect on their sex life, on two different scales: one 7-point scale measuring improvement (“much worse” to “much better”), and another 5-point scale measuring their assessment of their sexual performance and its impact on their life (“very poor” to “very good”).

Before the study, 96.8% of the men described their PE as very poor, or poor, at baseline, with an average time till ejaculation of under 2 minutes.

After the treatment, or just BELIEVING they had received treatment:

  • 95% of men perceived their PE as slightly better, better or much better (67.1% were better or much better)
  • 32% jumped up by two categories in improvement
  • Average time till ejaculation in men with a two category improvement jumped from 1.8 minutes at baseline to 4.3 minutes after treatment

While nearly all the men saw an improvement in their sexual stamina, on the medication or not, 15% of men had a two category jump in improvement of performance, just by BELIEVING they were on the medication, with no other mental intervention or help!

Power of SSRIs to Overcome PE

SSRI’s, such as Dapoxetine, have a very strong ejaculation delaying effect.

I personally went through a rough patch in my life several years back where my doctor recommended taking Zoloft, another SSRI in the same class.

I took it at it’s lowest dose, and while it did provide me the benefit of helping me get out of the rough spot I was in, it gave me some super sexual stamina powers at the same time.

I had to fight TO orgasm, rather than fight to keep FROM orgasming…

And when I weaned off the SSRI’s, I seemed to have kept some ejaculation control insights that I gleaned during the treatment.

However, SSRIs, even if taken on an “on-demand” basis, can cause side effects like a reduced libido and ability to achieve erection, as well as require a doctor’s visit, prescription, insurance, payment, etc.

So if you can overcome PE mentally, on your own and without the need for a prescribed medication, not only will it save you hassle and money, but you will feel great knowing you did it without any extra help.

The Mind’s Power To Overcome Premature Ejaculaion

Overcoming PE on your own

There are generally two causes of premature ejaculation — low serotonin levels (which is genetic) or incorrectly learned / trained responses to arousal and sexual stimulation.

In the first case, ejaculation control exercises and training can help you to a degree, but if you have chronically low serotonin levels, a low dose of an SSRI may be your best path to overcoming PE and getting your sexual performance back on track.

Not just that, but you will most likely improve your overall life experience as well.

However, if your response to sexual stimuli, arousal and physical stimulation is “incorrect”, perhaps due to speedily masturbating in the bathroom growing up, or a heavily guilt laden association with sex / masturbation from a traditional Christian upbringing or a home where sex was considered bad, then ejaculation control exercises will GREATLY improve your sexual performance.

The Benefits of Ejaculation Control Exercises to Your Sexual Stamina

Retraining your mind to KNOW that you can last long during sex will — as shown in the above-mentioned study — provide great benefit to your ability to delay ejaculation.

In the above study, the sole idea of believing they were being treated for their PE, allowed men to improve their sexual duration to some extent at least.

Training yourself to actually benefit from this positive mind-body-sexual stamina connection will show you even stronger ejaculation-delaying results than what was seen from this study.

For more information on ejaculation control exercises to overcome PE on your own, see here…

Have a good one!

-David Carreras aka Mr. Manpower
Mr. Manpower’s Guide to
Overall Manhood Enhancement

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