Turkesterone is an ecdysteroid, a plant steroid found in the Ajuga turkestanica plant. It is sold as a muscle-building supplement.
It is also one of the most talked-about and least well-evidenced products in the category. Here is what it actually is, what the research does and does not show, and what to expect if you try it.
Key points
- It is a plant steroid, not an anabolic steroid. Structurally different, and not an AAS.
- The human evidence is limited. Most claims come from animal and lab work, not people.
- It appears well tolerated. That is the clearest finding so far.
- Not a testosterone booster. It does not work on the androgen pathway.
- Set realistic expectations. Nothing here replaces training and protein intake.
What is turkesterone?
Turkesterone is an ecdysteroid, a class of steroid hormone that occurs naturally in plants and insects. In plants it is thought to act as a defence compound.
The turkesterone sold as a supplement is typically extracted from Ajuga turkestanica. It sits in the same broad family as ecdysterone, which is the more widely studied of the two.
What does turkesterone do in the body?
The proposed mechanism is that ecdysteroids increase muscle protein synthesis without acting on the androgen receptor, which is the pathway anabolic steroids use. That is the theory behind the marketing: muscle-building effects without the hormonal consequences.
The honest position is that this mechanism is far better described in animal and cell studies than in humans. Rodent research on ecdysteroids goes back decades. Controlled human trials on turkesterone specifically are very recent and very few.
Does turkesterone actually work?
The most direct human evidence to date is a preliminary study published on PubMed Central by Harris, Chapman-Lopez, Machek and colleagues. Eleven healthy men were given turkesterone and measured before, three hours after and 24 hours after ingestion.
The analyses failed to reveal any significant effects on serum IGF-1, resting metabolic rate, or lipid and carbohydrate metabolism. The researchers observed non-significant increases in IGF-1 compared with placebo, but these did not reach statistical significance. Their own conclusion is that the data fail to fully support turkesterone as a potent anabolic supplement.
Three things worth saying about that study
- It was small and short. Eleven participants, acute dosing, measured over 24 hours.
- It measured markers, not muscle. IGF-1 and metabolic rate are indirect indicators, not changes in lean mass over a training block.
- It was explicitly preliminary. The authors frame it as foundational work, not a verdict.
So the fair summary is not that turkesterone does not work. It is that the claims made for it run well ahead of the evidence, and anyone trying it should do so with modest expectations.
Does turkesterone count as a steroid?
Technically yes, in the chemical sense. It is a plant steroid. That is a different thing from what most people mean by the word.
Anabolic androgenic steroids are synthetic derivatives of testosterone that act on the androgen receptor. Ecdysteroids like turkesterone are structurally different and are not thought to act on that receptor at all. The research describes turkesterone as a naturally occurring plant steroid, distinguished from traditional anabolic androgenic steroids.
So it is a steroid by chemistry, and not a steroid in the way people usually mean it.
Is turkesterone safer than steroids?
They are not comparable products, so the comparison is not a useful one. Anabolic androgenic steroids carry well-documented risks and are prescription-only. Turkesterone is a supplement with a very short human research history.
What the current evidence does show is tolerability. The preliminary study noted a favourable hemodynamic and gastrointestinal tolerability profile, which in plain terms means it did not upset participants' stomachs or cardiovascular measures over the period studied.
That is genuinely reassuring as far as it goes. It is not the same as long-term safety data, because that does not exist yet.
Does turkesterone affect testosterone?
It is not understood to. The whole premise of ecdysteroids is that they work independently of the androgen pathway, which is why they are marketed as a non-hormonal option.
That cuts both ways. If you are looking for a testosterone booster, turkesterone is not it, and anything marketing it that way is misrepresenting the mechanism.
Are there negative side effects of turkesterone?
No significant adverse effects have been reported in the limited human research available, and the preliminary study specifically noted good tolerability.
The honest caveat is that the absence of reported side effects in a study of eleven people over 24 hours is not the same as a clean long-term safety record. There is not enough human research yet to say much with confidence either way.
Important. If you are subject to drug testing, check with your sporting body before using any ecdysteroid, as their status varies. If you have a health condition, are pregnant or breastfeeding, or take prescription medication, speak to your GP first.
Is turkesterone better than creatine?
No, and it is not close on the evidence.
Creatine monohydrate has decades of human trials behind it and is described in the International Society of Sports Nutrition position stand as the most effective ergogenic nutritional supplement currently available to athletes. Turkesterone has one small preliminary human study.
If you are choosing between them and you want the option most likely to do something, that is creatine. Turkesterone is the more experimental purchase. There is more on the differences in our guide to creatine HCl and creatine monohydrate.
What is the strongest supplement to build muscle?
There is no single answer, and any product marketed as one is overselling. The things that actually drive muscle growth, in order of how much they matter:
- Progressive resistance training. Nothing substitutes for this.
- Enough total protein and energy across the day.
- Sleep and recovery.
- Creatine monohydrate, which has the strongest evidence of any supplement in this space.
Everything else, turkesterone included, operates at the margins of those four.
Should you try it?
If you want to, treat it as an experiment rather than a foundation. Keep training and nutrition consistent so you can actually tell whether it did anything, and set expectations from the evidence rather than the marketing.
If you do want to try it, Emrald Labs Turkesterone is our house-brand option. For a first-hand account, read one customer's experience with turkesterone.
