Checked 2026-11-10. Independent clinical review has not been completed. WADAFUK is independent of WADA and does not provide medical advice or an individual anti-doping determination.
Prohibited at all times
2026 S4.3: prohibited at all times. Non-Specified. [1]
S4.3 · 2026 rules apply from 1 January 2026. Any 2027 material below concerns future rules from 1 January 2027; it is not current clearance.
Product evidence
A study of 12 black-market myostatin-propeptide products found the protein in nine. The researchers reported substantial impurities and an attached GST tag, making the material different from the expected untagged protein. [2]
- Primary-study abstract only. This is analytical product evidence, not a human efficacy or safety trial.
What remains uncertain
- No current authorized therapeutic formulation or adequate clinical safety evidence was verified.
Check the sources.
These are concise editorial paraphrases of selected sources, not a systematic review or a reproduction of source tables. Access depth is shown for each reference; an abstract-only check cannot resolve details found only in a full paper.
- WADA 2026 Prohibited List ↗Accessed 2026-11-10 · Relevant official full-text sections opened
Printed pp. 3, 9–12: introduction, S3, S4 and S5 as applicable
- Electrophoretic detection of black market myostatin propeptide ↗Accessed 2026-11-10 · Primary-study abstract and metadata
Abstract and bibliographic record
Check the current official WADA List and the relevant anti-doping authority for your sport, product, route and circumstances. Do not stop or change necessary treatment based on this page. Ask a qualified clinician about health decisions. Missing evidence does not establish safety.