Turinabol: The East German Secret — Educational Reference
Last updated: March 2026
Chlorodehydromethyltestosterone (CDMT/Turinabol) was secretly administered to East German Olympic athletes from 1968–1989. A hybrid of Dianabol and Clostebol, it produces lean gains without aromatization. This educational reference covers its pharmacology, documented doping history, hepatotoxicity, and harm reduction context.
(vs testosterone = 100:100)
Oral, per day
Once-daily dosing possible
📋 On this page
How Turinabol Works
Turinabol is structurally Dianabol with a 4-chloro substitution derived from Clostebol. That chloro group blocks aromatization entirely, making it estrogenic side-effect-free — at the cost of lower anabolic potency.
The 4-chloro group on the A-ring of CDMT prevents aromatase from converting it to estrogen. This structural feature — borrowed from Clostebol — eliminates water retention, gynecomastia risk, and estrogenic blood pressure elevation. Users experience dry, lean gains instead of the puffy bulk associated with Dianabol.
Turinabol has relatively low AR binding affinity (roughly 50% of testosterone) but its anabolic:androgenic ratio strongly favors muscle tissue over androgenic effects. The 4-chloro group also reduces androgenic activity — acne, hair loss, and prostate effects are less pronounced than Dianabol at equivalent doses.
Like Dianabol, Turinabol carries a 17α-methyl group enabling oral bioavailability. This modification causes hepatic stress — elevated ALT/AST — though generally considered less hepatotoxic than Dianabol due to lower potency and typically lower doses used. Long-cycle use still risks liver injury including cholestasis.
Despite low androgenic rating, Turinabol suppresses the hypothalamic-pituitary-testicular axis via androgen receptor signaling. LH and FSH decrease, halting natural testosterone production. Recovery after cessation requires weeks to months. SERM-based PCT (tamoxifen/clomiphene) is standard harm reduction.
What the Research Shows
Data from East German State Plan 14.25 documentation, post-reunification research, and limited clinical literature.
Side Effects & Risks
Key Takeaways
- Non-estrogenic — 4-chloro group prevents aromatization completely
- Produces lean, dry gains without water retention
- Lower androgenic activity than Dianabol (ratio 53:6 vs 90-210:40-60)
- 16-hour half-life allows once-daily dosing
- Still 17α-alkylated — hepatotoxic, monitor liver enzymes
- HPTA suppression occurs — PCT required after cycle
- East German doping program caused serious long-term harm to athletes
- Limited modern clinical research — most data from East German state records
- Long-term cardiovascular outcomes poorly characterized
- Optimal dosing for harm reduction not established
- Interaction with other compounds not well studied
- True incidence of hepatic injury in modern use unknown
🛒 Liver Support & Monitoring
Essential harm reduction for any oral 17α-alkylated compound.
Related Resources
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This page is for educational and harm reduction purposes only. It is not medical advice. Turinabol (CDMT, chlorodehydromethyltestosterone) is a Schedule III controlled substance in the United States. It is banned by WADA and all major sports organizations. The documented East German doping program caused serious, lasting harm to athletes — many of whom were uninformed minors. HighPeptides does not endorse or encourage the use of controlled substances or participation in doping. Consult a qualified physician before making any decisions regarding hormone use.