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Ecdysterone

Supplement phytosteroid fitness
Aka: beta-ecdysterone, 20-hydroxyecdysone
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
A 12-week trial found no gain over training alone
Pros & cons
Pros
  • Single 175 mg and 350 mg doses were well tolerated
  • Occurs in food — spinach and quinoa carry it
Cons
  • One tested product held <1% of its claimed content
  • On WADA's monitoring programme since 2020
  • Supplements may carry undeclared banned substances
Sources
  1. How reliable is the labeling of a commercial phytosteroid product? A 12-week randomized double-blind training study (Dissemond et al., JISSN 2025) · read 2026-08-27
    what it says
    “less than 1% of the claimed 20E concentration and 10.4% of the claimed DSG concentration were present in the capsules … The lack of group-specific differences suggests that the tested phytosteroid supplement did not provide additional benefits”
  2. HSA — Guidelines on Prohibited and Restricted Ingredients in Health Supplements and Traditional Medicines (Oct 2025), Annex A · read 2026-08-27
    what it says
    “A list of specific prohibited and restricted ingredients is provided in Annex A … This list is not exhaustive. Dealers are responsible to ensure that their products are safe and appropriate for the target consumers.”
  3. HSA — Health Supplements Guidelines (Jan 2026), Tables 4–5 · read 2026-08-27
    what it says
    “HS for use by the general adult population should not contain vitamins and minerals exceeding the stipulated limits stated in Tables 4 and 5.”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.