Ecdysterone and turkesterone: the one that works is the problem

They sit on the same shelf, in the same marketing language, at roughly the same price. Natural anabolic. Steroid-like results without the steroids. Plant-derived.

They are not the same thing, and the difference matters more to a tested athlete than to anybody else.

Start with the status, not the marketing

Being on the Monitoring Programme means something more specific than being prohibited, and for a fighter more uncomfortable.

That programme is where WADA puts substances it suspects are being misused, so it can gather data and decide whether to prohibit them.

A place on the list is a statement that the question is open.

Neither substance can be covered by a therapeutic use exemption, because you cannot get an exemption for something that is not prohibited.

Why ecdysterone is on that list

Because it appears to work.

The decision to monitor it rested largely on a 10-week controlled trial in humans, published in Archives of Toxicology in 2019, which reported performance-enhancing effects in strength training. The authors went beyond describing the effect: they concluded that ecdysterone shows anabolic potency similar to anabolic steroids and that it should therefore be added to the list of substances prohibited in sport.

Read that twice, because the industry quotes the first half of it constantly and the second half never.

The proposed mechanism is unusual and worth knowing. Ecdysterone does not appear to act on the androgen receptor the way testosterone derivatives do. Current thinking points at the beta estrogen receptor instead, which is why it is neither detected nor classified like a conventional anabolic steroid, and why the regulatory question has taken years rather than months to resolve.

And why turkesterone is not

Because nobody has shown it does anything.

Four weeks is short, and neither trial rules out something a longer study might find. The marketing, though, claims anabolic, and two trials have looked for that and not found it.

The logic that should decide this for you

Put the two facts side by side.

The compound with human evidence for an anabolic effect is the one WADA is watching, and the one a toxicology journal says should be banned.

The compound with no demonstrated effect is not being watched.

Those two observations are the same observation. A substance reaches the Monitoring Programme because it looks like it works, and a substance that works in the way these are advertised as working is, by definition, travelling toward the Prohibited List.

Which produces an unpleasant symmetry for anybody hoping to have it both ways. If turkesterone worked as advertised, it would have ecdysterone's problem. It does not have that problem, and the trials suggest why.

What is actually in the bottle

This part applies whatever you decide about the anti-doping question, and it is better documented than most people selling these products would like.

Independent analyses of ecdysteroid products have repeatedly found actual content far below the label. In one widely cited case a product contained 6 mg of 20-hydroxyecdysone against a declared 100 mg. Analyses have also found products sold as turkesterone that in fact contained ecdysterone.

For a tested athlete this is the whole risk, and it is the same risk described everywhere else on this site: whether this batch was tested by somebody independent, and what came along with it, far more than whether the named ingredient is prohibited.

The date that matters

The Prohibited List is revised annually and takes effect on 1 January. Substances move onto it. Nothing is grandfathered, and no allowance exists for the athlete who bought a year's supply in November.

And the question is being actively settled. WADA funded a 12-week study on ecdysterone in 2025, which has not yet been published. Whatever it finds will inform a decision that has been pending since 2020.

A fighter taking ecdysterone today is taking something legal that a supervising body has publicly flagged as a candidate for prohibition, while the evidence that will decide the matter is being collected. That is a different position from taking creatine, and it deserves to be understood as different rather than filed under the same heading of "not banned".

What I would say to a fighter

• The evidence for turkesterone does not support buying it. Two trials, no effect, and a price that assumes otherwise.
• The evidence for ecdysterone is stronger, and that is the argument against it rather than for it. You would be taking the thing a monitoring programme exists to evaluate, at a point in your career where a list change can cost you a year.
• Neither category can be trusted to contain what the label says, and one documented failure mode puts the monitored compound inside a product sold as the unmonitored one.

What actually builds the mass these products are sold for is unglamorous and already covered here: enough food, enough protein spread across the day, enough training, and enough patience for a quarter to half a percent of body mass a week.

Nobody sells that in a tub. Which is why the shelf is full of alternatives.