How to Take Ecdysterone: Dosage, Timing and Duration

Ecdysterone, often sold as beta-ecdysterone or 20-hydroxyecdysone, is a plant compound that has moved from Soviet-era sports science into mainstream supplement shops. A widely discussed 2019 study reignited interest, and it now sits on the World Anti-Doping Agency's monitoring list. Our editorial team looks at how it is taken in practice, what the research doses were, and why product quality is the biggest unknown.

What ecdysterone is

Ecdysteroids are steroid-like hormones that control moulting in insects and crustaceans. Many plants produce the same compounds, probably as a defence against insects. The most common of these is 20-hydroxyecdysone, known commercially as ecdysterone or beta-ecdysterone.

Supplement makers extract it mainly from plants such as spinach, quinoa, Cyanotis vaga, Rhaponticum carthamoides (maral root) and Achyranthes. Spinach is often mentioned in marketing, but the amounts in food are tiny compared with concentrated extracts; you would need to eat kilograms of spinach a day to match a typical capsule.

Although it has a steroid skeleton, ecdysterone does not appear to bind meaningfully to the androgen receptor, which is why it is not regarded as an anabolic steroid. Laboratory work suggests that its effects in muscle cells may instead involve the oestrogen receptor beta (ERβ) and downstream signalling pathways linked to protein synthesis.

In the UK and EU, ecdysterone extracts are sold as food supplements. Novel food rules and food safety law apply, but the products are not licensed medicines and have not been assessed for efficacy by the MHRA or EFSA.

What the research actually shows

Much of the early research came from the former Soviet Union and was published in Russian, often with small samples and limited detail. Animal experiments showed increased muscle growth in rats, and in 2008 Gorelick-Feldman and colleagues found that phytoecdysteroids increased protein synthesis in cultured muscle cells.

The study that drew wide attention was published in 2019 by Isenmann, Parr and colleagues at the Free University of Berlin, with support from WADA. Young men completing a ten-week strength training programme who took ecdysterone-containing supplements gained more muscle mass and showed greater improvements in one-rep max bench press than those on placebo.

The authors were cautious. The study was relatively small, the doses were provided through commercial products, and no other high-quality trials had replicated the result at the time. An earlier controlled trial by Wilborn and colleagues in 2006 had found no significant effect of 200 mg/day of 20-hydroxyecdysone on body composition or strength in trained men.

In short, the evidence is mixed and limited. There is a plausible mechanism and one encouraging trial, but it would be wrong to say ecdysterone has been proven to build muscle in the way creatine or adequate protein intake has.

Dosage used in studies and in practice

Because ecdysterone is a food supplement rather than a medicine, there is no official recommended dose. The most useful reference points are the amounts used in human studies and those printed on reputable product labels.

In practice, many users take between about 200 and 500 mg of declared ecdysterone per day, split into two doses. Products differ in whether the label refers to the total extract weight or to the amount of pure 20-hydroxyecdysone, so it is essential to read the small print: 500 mg of a 50% extract contains only 250 mg of the active compound.

Some people scale the dose by body weight, but there is no robust evidence that this improves outcomes. Taking larger amounts than those used in research has no demonstrated advantage and simply increases cost and uncertainty.

Timing and course duration

Ecdysterone has a short half-life in humans, measured in hours, so splitting the daily amount into two doses is a common approach. Taking it with meals may improve tolerance and possibly absorption, as oral bioavailability of ecdysteroids appears to be low.

A practical routine for healthy adults who decide to try it might look like this:

1. check the label to establish how much pure ecdysterone each capsule provides;
2. split the daily intake into a morning and an evening dose with food;
3. on training days, take one dose with the meal closest to your session;
4. keep training, protein intake and sleep consistent, so you can judge any effect;
5. reassess after the course rather than continuing indefinitely.

Courses of roughly eight to twelve weeks are common, mirroring the ten-week duration of the Berlin study. There is no evidence that ecdysterone suppresses natural testosterone production, so the "off cycle" concept borrowed from steroid use does not apply in the same way. A break is still sensible, mainly because long-term safety data are lacking.

Expect subtle results at best. Any benefit is likely to be modest and will only show alongside structured resistance training and adequate nutrition.

Safety, label accuracy and sport

Human studies to date have not reported serious side effects at the doses tested, and animal data suggest low toxicity. However, trials have been short and small, and data on long-term use, pregnancy, breastfeeding and people with hormone-sensitive conditions are essentially absent. Those groups should avoid ecdysterone.

Label accuracy is a major concern. Analyses of commercial products, including work by Parr's group, have found that many contained far less ecdysterone than claimed, and some contained none at all. Contamination with undeclared substances is a broader problem in the supplement market.

For athletes, there is an extra issue. Following the Berlin findings, WADA added ecdysterone to its Monitoring Program, which tracks substances that are not prohibited but may be misused. As of the most recent lists we have reviewed, it is not banned, but status can change, so competitors should check the current WADA list and UK Anti-Doping guidance before use.

If you take medicines for diabetes, hormone therapy or any long-term condition, discuss ecdysterone with your GP or pharmacist first, as interactions have not been properly studied.

Editorial conclusions

Ecdysterone is one of the more intriguing natural compounds in sports nutrition, with a plausible mechanism and one well-publicised positive trial. The overall body of human evidence, however, remains thin and partly contradictory.

Doses in studies range from about 200 mg to several hundred milligrams per day, usually split with meals, over courses of around two to three months. The biggest practical problem is not the dose itself but knowing what is really in the capsule.

If you choose to try it, select a product with a clear statement of pure 20-hydroxyecdysone content and independent testing, and treat it as an optional extra rather than a foundation of your programme.

Related reading on our site includes articles on turkesterone and other ecdysteroids, on how to judge supplement quality, and on the WADA Monitoring Program.

References

1. Isenmann E, Ambrosio G, Joseph JF, et al. Ecdysteroids as non-conventional anabolic agent: performance enhancement by ecdysterone supplementation in humans. Arch Toxicol. 2019;93(7):1807–1816.
2. Wilborn CD, Taylor LW, Campbell BI, et al. Effects of methoxyisoflavone, ecdysterone, and sulfo-polysaccharide supplementation on training adaptations in resistance-trained males. J Int Soc Sports Nutr. 2006;3(2):19–27.
3. Gorelick-Feldman J, MacLean D, Ilic N, et al. Phytoecdysteroids increase protein synthesis in skeletal muscle cells. J Agric Food Chem. 2008;56(10):3532–3537.
4. Parr MK, Zhao P, Haupt O, et al. Estrogen receptor beta is involved in skeletal muscle hypertrophy induced by the phytoecdysteroid ecdysterone. Mol Nutr Food Res. 2014;58(9):1861–1872.
5. Dinan L, Dioh W, Veillet S, Lafont R. 20-Hydroxyecdysone, from plant extracts to clinical use: therapeutic potential for the treatment of neuromuscular, cardio-metabolic and respiratory diseases. Biomedicines. 2021;9(5):492.
6. Maughan RJ, Burke LM, Dvorak J, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439–455.