Turkesterone (Ajuga turkestanica Extract)
The most potent natural ecdysteroid, derived from Ajuga turkestanica. Promotes lean muscle protein synthesis through a non-androgenic mechanism — no testosterone suppression, no virilisation, no HPTA disruption. Limited but promising human data.
Medical Disclaimer: The information on this page is for educational and research purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.
What Is Turkesterone?
Turkesterone is an ecdysteroid — a class of steroid hormones found in plants and insects — extracted primarily from Ajuga turkestanica, a plant native to Central Asia. It is the most bioactive ecdysteroid identified to date in terms of anabolic activity.
The key distinction from anabolic steroids: ecdysteroids do not bind androgen receptors. Their anabolic effects operate through entirely different molecular pathways, which theoretically eliminates androgenic side effects — no testosterone suppression, no virilisation, no need for post-cycle therapy.
Mechanism of Action
Turkesterone's anabolic effects appear to occur via ecdysteroid receptor activation and downstream PI3K/Akt/mTOR signalling. This pathway drives muscle protein synthesis independently of the androgen receptor — the same receptor targeted by testosterone and anabolic steroids.
A 2019 study in Archives of Toxicology demonstrated that ecdysteroids (including turkesterone) produced significant muscle mass increases in rats comparable to the anabolic steroid metandienone, without androgenic effects. A 2021 human study showed lean mass gains over 10 weeks.
Human Evidence
A randomised, double-blind, placebo-controlled trial (Isenmann et al., 2021) enrolled 46 trained men over 10 weeks. The turkesterone group showed significantly greater lean mass gains compared to placebo. Strength improvements trended positive but did not reach statistical significance.
This is the highest-quality human evidence available. It is encouraging but limited to a single trial.
Dosage
| Parameter | Recommendation |
|---|---|
| Dose | 500–1000 mg/day |
| Standardisation | ≥10% turkesterone |
| Timing | Split doses with meals |
| Cycle | 12 weeks on, 4 weeks off |
| Form | HPβCD complex preferred for bioavailability |
Related Research
Stacking Interactions
How Turkesterone (Ajuga turkestanica Extract) interacts with other compounds
Safety Profile — Tier B
Generally safe — moderate evidence
Contraindications
- ●Pregnancy and breastfeeding
- ●Known hypersensitivity to plant extracts
Side Effects
- ●Generally well-tolerated in reported human use
- ●Mild GI discomfort at high doses
- ●No androgenic side effects reported