What Is Ecdysterone?
Ecdysterone (20-hydroxyecdysone) is a plant steroid hormone found in spinach, quinoa, and many other plants. In insects it governs moulting, but in mammals it has an entirely different effect -- it binds to oestrogen receptor beta, producing anabolic effects without androgenic side effects (Dinan & Lafont, 2006).
Put simply: ecdysterone acts in the body like a muscle-growth signal, but does not affect testosterone levels, does not cause acne, hair loss, or other typical steroid side effects.
Who Is This Guide For?
Training adults looking for a legal, safe supplement to support muscle growth. After reading, you will know what the science says, which dose works, and whether the price is justified.
TL;DR
- Isenmann et al. (2019) study showed that 800 mg/day ecdysterone significantly increased muscle mass over 10 weeks compared to placebo
- WADA has added ecdysterone to its monitoring programme, but it is NOT currently banned
- Mechanism: ER-beta receptor activation, not androgen receptor -- so no hormonal disruption
- Evidence is promising but limited -- one strong human study and several animal studies
- Product quality matters: many products on the market contain minimal actual ecdysterone
- Dose: 500-800 mg daily, split into 2-3 doses
What Do the Studies Show?
Isenmann et al. (2019) -- The Key Study
This Free University of Berlin study is the most cited human trial on ecdysterone:
- Participants: 46 trained men, 10-week double-blind placebo-controlled trial
- Dose: up to 800 mg ecdysterone daily (from spinach extract)
- Results: the ecdysterone group gained 2 kg more muscle mass than placebo, and strength (bench press) increased significantly more
- Side effects: none -- hormonal markers (testosterone, cortisol, IGF-1) did not change
- Authors' conclusion: ecdysterone may be a potent anabolic agent and WADA should consider adding it to the prohibited list
Limitations You Should Know
While Isenmann et al. is impressive, it is honest to acknowledge:
- It is one study -- independent replication has not yet occurred
- The sample was relatively small (46 participants)
- Some experts have questioned the dosing and spinach extract purity
- Animal studies (Parr et al., 2015) support the findings, but animal-to-human translation is not direct
Dinan & Lafont (2006) -- Mechanism Review
This comprehensive review showed that ecdysteroids:
- Activate ER-beta receptors (not androgen receptors)
- Show adaptogenic effects (stress resistance)
- Do not cause virilisation (masculinisation) in women
- Are not toxic to liver or kidneys at studied doses
How to Use Ecdysterone
Recommended Dosage
| Goal | Daily Dose | How to Take |
|---|---|---|
| Muscle mass support | 500-800 mg | Split into 2-3 doses with meals |
| General well-being | 200-500 mg | 1-2 doses daily |
| Beginners | 200 mg | Start low, increase gradually |
Cycling
Unlike anabolic steroids, ecdysterone cycling is not strictly necessary since it does not affect the body's hormonal levels. However, a prudent approach:
- 8-12 week cycle of use
- 4 week break before the next cycle
- Reason: long-term safety data are limited
How to Choose Quality Ecdysterone
| Feature | Quality product | Questionable product |
|---|---|---|
| Ecdysterone content | Tested, 90%+ purity | "Extract amount" with no purity data |
| Source | Spinach or Cyanotis vaga | Undefined "plant extract" |
| Third-party testing | Present (HPLC) | Absent |
| Dose per capsule | 200-500 mg | Under 100 mg |
| Price | EUR 20-40 / month | Under EUR 10 (questionable purity) |
Common Mistakes
1. Too low a dose -- many products contain only 100 mg per capsule. The study used 800 mg daily.
2. Steroid-level expectations -- ecdysterone is mild. Expect 1-2 kg extra muscle over 10 weeks, not steroid-level results.
3. Poor quality product -- cheap products may contain minimal actual ecdysterone. Prefer tested products.
4. Ignoring training -- ecdysterone does not replace training. Benefits appear only alongside resistance exercise.
5. Excessive expectations for women -- while ecdysterone is safe for women, human studies were conducted with men. Women's results may differ.
Frequently Asked Questions
Is ecdysterone legal?
Yes. Ecdysterone is not on the WADA prohibited list (as of 2026). It is legal in the European Union as a dietary supplement.
Is ecdysterone safe?
Based on current research, yes. No hormonal side effects have been identified. However, long-term (over 1 year) safety studies are lacking.
Can women use ecdysterone?
Yes. Since ecdysterone does not work through the androgen receptor, it does not cause virilisation. However, human studies were conducted with men.
Does ecdysterone affect hormones?
In Isenmann et al. (2019), testosterone, cortisol, and IGF-1 levels did not change. Ecdysterone is not a hormonal supplement.
Should I use ecdysterone instead of creatine?
These are different supplements with different mechanisms. Creatine has a much stronger evidence base (hundreds of studies). Ecdysterone is newer and less studied. They can be used together.
Local Angle
Ecdysterone is available in Estonia for EUR 20-40 per month. MaxFit offers quality ecdysterone products that are third-party tested. Free shipping from EUR 75 orders.
References
1. Isenmann E, Ambrosio G, Joseph JF, Mazzarino M, de la Torre X, Zimmer P, Kazlauskas R, Goebel C, Botre F, Diel P, Parr MK. (2019). Ecdysteroids as non-conventional anabolic agent: performance enhancement by ecdysterone supplementation in humans. Archives of Toxicology, 93(7), 1807-1816.
2. Parr MK, Botre F, Nass A, Hengevoss J, Diel P, Wolber G. (2015). Ecdysteroids: A novel class of anabolic agents? Biology of Sport, 32(2), 169-173.
3. Dinan L, Lafont R. (2006). Effects and applications of arthropod steroid hormones (ecdysteroids) in mammals. Journal of Endocrinology, 191(1), 1-8.
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