Head to head
Ecdysterone against Turkesterone
The ecdysteroid with a positive controlled human trial and the one that outsells it with no human trial at all. Turkesterone's reputation is borrowed from ecdysterone, whose trial authors recommended it be added to the doping ban list.
Column A
EcdysteroneEcdysterone (20-hydroxyecdysone), plant and insect ecdysteroid
The one ecdysteroid with a positive controlled human trial: more muscle mass and more bench press strength, with the authors recommending it be added to the doping ban list.
Column B
TurkesteroneTurkesterone, ecdysteroid from Ajuga turkestanica
The best-selling ecdysteroid supplement, and the one with no human trial at all. Its reputation is borrowed from a related molecule that was actually tested.
Side by side, on the facts we can check
| Attribute | Ecdysterone | Turkesterone |
|---|---|---|
| Category | Muscle & Performance | Muscle & Performance |
| FDA status | Sold as a dietary supplement in the United States. Not an approved drug. Its pharmaceutical form, BIO101, is investigational. | Sold as a dietary supplement. Not an approved drug and not approved for any indication. |
| Half-life | Short, with oral bioavailability generally reported as poor, which is the main obstacle to translating cell and animal results. No single agreed human figure was resolved in the sources loaded. | Not asserted. No human pharmacokinetic data for turkesterone was resolved in the sources loaded. |
| Molecular weight | 480.6 Da. A polyhydroxylated steroid, not a peptide. | 496.6 Da. An ecdysteroid, not a peptide. |
| Mechanism | A polyhydroxylated steroid that does not bind the androgen receptor, which is the mechanistic reason it is proposed to build muscle without androgenic effects. The best-supported route is signalling through the estrogen receptor beta, activating the phosphoinositide 3-kinase and Akt and mTOR pathway to increase muscle protein synthesis. In its pharmaceutical development it is described as an activator of the MAS receptor, part of the protective arm of the renin-angiotensin system, which is a different proposed mechanism for the same molecule. That two credible mechanisms are offered for one compound is worth noting as a sign the pathway is not settled. | An ecdysteroid extracted from Ajuga turkestanica, differing from 20-hydroxyecdysone by an additional hydroxyl group at the 11-alpha position. The proposed mechanism is the one attributed to ecdysteroids generally: signalling through estrogen receptor beta to activate the Akt and mTOR pathway and increase muscle protein synthesis, without binding the androgen receptor. Whether turkesterone does this in humans at achievable doses has not been measured. Ecdysteroid oral bioavailability is generally poor, and no human pharmacokinetic data for turkesterone specifically was resolved in the sources loaded, so it is not even established that meaningful concentrations are reached. |
| Human studies cited | 3 | 1 |
| Legal status, US | Sold as a supplement | Sold as a supplement |
Frequently asked questions
What is the difference between Ecdysterone and Turkesterone?
Ecdysterone: The one ecdysteroid with a positive controlled human trial: more muscle mass and more bench press strength, with the authors recommending it be added to the doping ban list. Turkesterone: The best-selling ecdysteroid supplement, and the one with no human trial at all. Its reputation is borrowed from a related molecule that was actually tested.
Which has stronger research evidence, Ecdysterone or Turkesterone?
This database does not grade compounds. It counts what was run in people: 3 of the 3 studies cited on the Ecdysterone profile were human work, against 1 of 2 for Turkesterone. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Ecdysterone and Turkesterone FDA-approved?
Ecdysterone: Sold as a dietary supplement in the United States. Not an approved drug. Its pharmaceutical form, BIO101, is investigational.. Turkesterone: Sold as a dietary supplement. Not an approved drug and not approved for any indication..
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.