Turkesterone is one of the most hyped supplements in recent years - and one of the most misunderstood. Influencers have compared it to mild steroids, supplement companies have written about magical muscles without side effects, and the gym world has built a mythology around it that is hard to separate from reality.
This guide gives you the honest version. What does the research say? What do anecdotes say? How does turkesterone compare to alternatives like creatine and ecdysterone? And who has a realistic reason to try it?
What is turkesterone?
Turkesterone is an ecdysteroid - a class of steroid-like compounds found naturally in insects and in certain plants, primarily Ajuga turkestanica. The chemical name is 11alpha-hydroxy-20-hydroxyecdysone. Supplements are almost exclusively based on extracts from this plant. Turkesterone is legal, classified as a dietary supplement and not banned by WADA. It is not an anabolic steroid in the pharmacological sense - it does not bind to androgen receptors.
How does it work - the theory
The proposed mechanism is that turkesterone activates the oestrogen beta receptor (ERbeta) and stimulates anabolic signalling pathways, primarily the mTOR pathway that regulates muscle protein synthesis. In cell studies and rat studies increased protein synthesis has been observed.
The problem is the step from there to "works in humans at the doses people actually take". Oral bioavailability of turkesterone is low - the body breaks it down quickly - and it is unclear what dose actually reaches target cells in sufficient concentration.
What does human research actually show?
Study 1 - Harris et al. 2024 (DXA measurement, 4 weeks)
Actively training men and women randomised to 500 mg/day turkesterone or placebo for 4 weeks. Measured via DXA (gold standard for body composition). Result: no significant differences in body weight, lean mass, fat mass or body fat percentage versus placebo.
Study 2 - 2025 randomised double-blind study
Tested a turkesterone-containing supplement for 4 weeks. Measured body composition, hand-grip strength, mood and sleep. Result: no significant differences between supplement and placebo group on any measure.
An important critical note about older studies
Many of the positive studies circulating about turkesterone are either conducted on rats, performed on cell cultures, or funded by manufacturers with a commercial interest. That does not make them worthless - but it is an important filter when reading about turkesterone online. Independent human studies are the only standard that counts.
Leading expert voice: Dr Eric Trexler, who professionally reviews hypertrophy research and has published over 30 studies: "At this point, there is not sufficient evidence that turkesterone improves strength or muscle mass in humans."
Why are anecdotal results so strong - and why that is not enough
A reason for the turkesterone mythology is that gym-goers report strong results. That is probably true - but it is not necessarily turkesterone causing them. Three common explanations:
- New start effect: Beginning a new supplement protocol often coincides with increased motivation, better diet and harder training.
- Placebo effect: Expectation effects on strength and recovery are well-studied and real.
- Product quality problems: Independent tests have historically shown many turkesterone products contained dramatically lower doses than labels stated - or other ecdysteroids like ecdysterone (which has stronger human data).
Turkesterone vs ecdysterone - which is more studied?
It is ecdysterone (20-hydroxyecdysone), not turkesterone, that has more human data behind it. A well-cited study showed significant improvement in skeletal muscle mass in trained men over 12 weeks with 200 mg/day ecdysterone. Another study led WADA to discuss whether ecdysterone should be classified as a doping substance (it was not). Turkesterone is marketed as more potent based on animal studies - but this has not been confirmed in human studies.
Who might benefit from turkesterone?
- Experienced training practitioners who have already optimised the fundamentals: progressive overload, sufficient protein intake, creatine, sleep and diet. Turkesterone is a marginal intervention.
- Those comfortable with the uncertainty - you are paying for a well-motivated experiment, not a guaranteed effect.
- Not suitable as a foundational supplement for beginners. Creatine has a vastly stronger and larger evidence base and should be prioritised.
Dosage
- Standard: 400-800 mg/day of Ajuga turkestanica extract (not pure turkesterone)
- Take with food - improves absorption and reduces risk of stomach discomfort
- Cycle 8-12 weeks, then 4 weeks off
- Check standardisation: Choose products that state turkesterone content per capsule and have third-party analysis (COA)
Safety and side effects
Turkesterone has an excellent safety profile. It does not bind to androgen receptors, which eliminates classic steroid side effects: hormonal disruption, liver strain, hair loss, testicular dysfunction. No serious adverse events have been reported in available studies. No PCT (post-cycle therapy) required.
Stacking with other supplements
- Turkesterone + Creatine: Creatine has strong evidence for muscle mass and strength. If you try turkesterone, use creatine as your foundation.
- Turkesterone + Fadogia Agrestis: Popular biohacking stack - fadogia for LH stimulation and hormonal environment, turkesterone for protein synthesis potential.
- Turkesterone + NAD+ and Resveratrol: For those combining performance optimisation with longevity thinking.
Find Noop's turkesterone in our training and muscle gains collection.
FAQ
Is turkesterone legal?
Yes. Turkesterone is a legal dietary supplement in the EU and is not banned by WADA. Athletes competing under WADA rules can use it without risk of a positive test.
Is turkesterone a steroid?
Technically yes in chemical terms - it has a multi-ring carbon structure. But it is not an anabolic steroid like testosterone or nandrolone. It does not bind to androgen receptors and does not produce androgenic side effects.
How long does it take to see an effect from turkesterone?
Most anecdotal reports describe a sense of better recovery and pump after 2-4 weeks. Human studies over 4 weeks have not shown measurable changes in body mass.
What is the difference between turkesterone and ecdysterone?
Both are ecdysteroids from Ajuga plants. Ecdysterone has more and stronger human data. Turkesterone is marketed as more potent based on animal studies - but this has not been confirmed in human studies.
Do I need PCT after turkesterone?
No. Turkesterone does not affect the body's own testosterone or oestrogen production and requires no PCT.