Illustration of a bodybuilder using turkesterone to build muscle.

Does Turkesterone Work? (Explaining the Scam)

Is turkesterone a good supplement for building muscle? It’s been promoted everywhere lately—Joe Rogan, More Plates More Dates, Greg Doucette, and Vitruvian Physique have all discussed its benefits. The idea is that it can boost testosterone production, allowing us to build muscle faster and more leanly. But is there any good evidence to back those claims up? And if so, what kinds of results can you expect?

Our specialty is helping skinny guys bulk up. Cutting-edge supplements are a bit outside of our wheelhouse. That’s why we spoke with Eric Trexler, Ph.D. He’s got a doctorate degree in sports science, has published over 30 strength and hypertrophy studies, and professionally reviews research for Monthly Applications in Strength Sport (MASS). This is exactly his area of expertise. We also have a few studies to review. And then there’s the official position of the International Society of Sports Nutrition (ISSN).

So, does turkesterone live up to the hype? Can it help you build muscle?

Is turkesterone a good muscle-building supplement? Or is it a scam?

What is Turkesterone?

Turkesterone is a phytoecdysteroid, a chemical produced by plants (such as spinach) as a defence mechanism against insects. When insects consume the plant, the phytoecdysteroids make their shells fall off (moult), killing them. Kind of brutal. But on the other hand, ecdysteroid has the word “steroid” in it. So, as you might imagine, bodybuilders have started supplementing with it. And they aren’t totally wrong. Turkesterone is thought to be an agonist of the estrogen beta receptor, which could then boost testosterone, increasing anabolism and thus increasing muscle growth. At least in theory.

That’s where turkesterone comes in. Turkesterone is a phytoecdysteroid, and it’s currently one of the most hyped supplements on YouTube. But does it work?

Is Turkesterone Good for Building Muscle?

A few studies found ecdysteroids (such as turkesterone) had performance-enhancing effects in birds and beetles (study, study). But the International Society of Sports Nutrition (ISSN) considers these studies unreliable because they weren’t published in reputable journals, the design of the studies was subpar, and the results were poorly presented. This is not the evidence we’re looking for. So, what about human trials?

There’s one study that’s often used to show the muscle-building benefits of supplementing with ecdysterone. It’s this paper by Isenmann et al. The results were impressive:

One study found increases in muscle mass from supplementing with ecdysterone.

But the study is a little weird. The ecdysteroid supplements they were testing only contained 6% of the dosage listed on the label, which shouldn’t have been enough to produce an effect. But it did. At least according to the BIA scale they used. But BIA scales are a poor way of measuring muscle growth. So although these results are interesting, I’m skeptical, as are most experts.

Graph showing that supplementing with ecdysteroids like turkesterone doesn't increase muscle growth.

There’s another study we can look at, though. The researchers used DEXA scans to measure muscle growth, which is a much more reliable tool. And in this study, the placebo group gained 2.2 pounds more muscle than the guys taking ecdysteroids, though the results didn’t reach statistical significance. This doesn’t suggest that turkesterone harms muscle growth, just that small studies often find differences between groups. These differences don’t necessarily prove anything. And in this case, the difference isn’t statistically significant.

This second paper is more credible, especially since DEXA scans are more reliable than BIA scales. As a result, the ISSN’s stance on turkesterone is:

Ecdysterones [including turkesterone] are not recommended for supplementation to increase training adaptations or performance.

The International Society of Sports Nutrition

It’s also worth pointing out that the above are studies on ecdysteroids, not on turkesterone specifically. At the moment, there’s no good research showing turkesterone is effective. But this isn’t our area of expertise. Maybe we’re missing something. So we asked Eric Trexler, Ph.D., for a more specific answer, asking him whether he recommends using turkesterone to bulk up.

Dr Trexler has published over 30 studies. Perhaps more relevantly, he professionally reviews hypertrophy research, including both of the turkesterone studies. He told me:

At this time, there is not sufficient evidence to suggest that turkesterone enhances increases in strength or muscle mass in humans.

Eric Trexler, PhD, Monthly Applications in Strength Sport (MASS)

If you’ve been in the fitness industry for a while, you know how these things go. Glutamine is the hot thing, then gets disproven. Then arginine. Then BCAAs. Then Tribulus. All of them were disproven. Supplement hype rarely lasts long, but while it does, millions of dollars are made from people yearning for an edge.

Is Turkesterone A Scam?

The next question is whether turkesterone supplements contain the ingredients they advertise in doses that could conceivably be effective. This is where the argument for turkesterone begins to break down even more.

The controversy began with Nootropics Depot, a lab that tests the quality of various supplements. They tested a few of the most popular brands of turkesterone, including the turkesterone sold by Gorilla Mind (owned by More Plates More Dates) and Harder Than Last Time (owned by Greg Doucette). They found that these supplements contained less than 1% of the turkesterone they advertised.

Nootropics Depot also sells its own supplements, including ecdysterone. This makes them a competitor to the brands who sell turkesterone. As a result, their claims were met with quite a lot of skepticism. However, when More Plates More Dates and Greg Doucette hired independent labs to test their own supplements, they confirmed that the turkesterone was fake. The supplements did indeed contain less than 1% of the turkesterone advertised on the bottle.

So it seems that even the anecdotal evidence in favour of turkesterone comes from people using fake turkesterone supplements.

2023 Update

A new study was just published. It was looking at whether supplements actually contain the ingredients on the label. They tested turkesterone supplements. None of the turkesterone supplements contained even 1% of the turkesterone quantity claimed on the label.

At this point, the evidence is overwhelming: turkesterone is a scam. It probably doesn’t work, and you can’t buy it anyway—all of the turkesterone on the market is fake.

Final Review

There aren’t any good studies showing turkesterone will help you build muscle. In fact, the most relevant evidence shows that other ecdysteroids that are similar to turkesterone don’t increase muscle growth. There’s no evidence to show it’s dangerous and nothing to prove it’s safe.

Most hype surrounding turkesterone comes from the people who produce it, sell it, or make affiliate revenue from promoting it. There are few, if any, unbiased experts who believe it works. The most credible experts recommend against it.

Plus, at the time of writing, there’s no reliable way to buy turkesterone. The biggest vendors cannot reliably fill their capsules with even 1% of the turkesterone they advertise on the label. It’s one of the scummiest parts of the supplement industry, which is already rife with fraud.

With supplements, it’s wise to be a late adopter. There are a few good muscle-building supplements with decades of research proving their effectiveness: creatine, caffeine, and protein. These are the supplements you should turn to when you’re looking for better muscle-building results.

Finally, keep in mind that even the best supplements pale in comparison to hypertrophy training, eating a good bulking diet, and getting enough good sleep.

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If you want all the latest muscle-building information, we have a newsletter for naturally thin guys. If you want a full foundational bulking program, including a 5-month full-body workout routine, diet guide, recipe book, and online coaching, check out our Bony to Beastly Bulking Program. Or, if you want a customizable intermediate bulking program, check out our Outlift Program.

Shane Duquette is the founder of Outlift, Bony to Beastly, and Bony to Bombshell, each with millions of readers. He's gained seventy pounds and has over a decade of experience helping more than ten thousand naturally thin people build muscle. He also has a degree in design, but those are inversely correlated with muscle growth.

Marco Walker-Ng is the founder and strength coach of Outlift, Bony to Beastly, and Bony to Bombshell. He's a certified trainer (PTS) and nutrition coach (PN) with a Bachelor's degree in Health Sciences (BHSc) from the University of Ottawa. He has over 15 years of experience helping people gain muscle and strength, with clients including college, professional, and Olympic athletes.