Chlordehydromethyltestosterone (Turinabol)
Also known as: Turinabol, Tbol, T-Bol, Oral Turinabol, Chlordehydromethyltestosterone, OT
Oral compound without aromatization, developed in the GDR state doping programme — moderate in effect, dry in character, and with an unusually long detection window.
Substance family
Built on the testosterone skeleton. Most convert to estradiol via aromatase, which is why estrogen management is a topic here — water retention, gynecomastia risk, and the option of an aromatase inhibitor.
Effects on
Which outcomes this substance acts on — descriptive, not a recommendation.
Strain profile
Where this substance is most likely to hit — a rough orientation, individually dependent on dose, duration and predisposition.
Dosing & protocols by goal
Rough orientation ranges as reported in harm-reduction literature — not an individual treatment plan. Doses are individual and open-ended; frequency depends on the ester or half-life.
Not medically indicated
MedicalDose
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Frequency
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Cycle length
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Developed and produced in the GDR specifically for athletic performance, never for a medical indication.
Definition or lean gain — Intermediate
IntermediateDose
30–50 mg / day
Frequency
Split into 2 doses
Cycle length
6–8 weeks
Produces no water retention, so gains build slowly but stay largely intact after stopping.
Higher doses
AdvancedDose
> 50 mg / day
Frequency
Split into 2 doses
Cycle length
6–8 weeks
Liver values and lipid profile deteriorate noticeably; the effect scales considerably less than the burden.
Side effect & countermeasure
Typical problems and what you can do to reduce harm — at a glance. Does not replace medical monitoring.
Problem
Severe drop in HDL, rise in LDL
Countermeasure
As with all orals, the lipid profile is the main concern. Cardio, omega-3 and citrus bergamot as the base; with strongly deteriorated values, ezetimibe or pitavastatin under medical guidance. Measure a baseline before starting. If a statin is started, CoQ10 belongs alongside it — statins deplete it through the same pathway.
Problem
Liver strain from 17-alpha-alkylation
Countermeasure
Moderate compared with oxymetholone, but present. Check ALT, AST and GGT before and during use, avoid alcohol, do not combine with other orals, limit to 6–8 weeks. TUDCA at 500–1000 mg daily addresses the cholestaticcholestaticBile backing up in the liver because its flow is obstructed — the specific liver injury oral steroids cause. mechanism directly; NAC supports the antioxidant system alongside it.
Problem
Very long detection window in doping tests
Countermeasure
Long-term metabolites of turinabol remain detectable for months — in some analyses considerably longer than for comparable substances. Unsuitable for anyone subject to testing, regardless of when the last dose was taken.
Problem
Estradiol falls too low (joint pain, low libido, low mood)
Countermeasure
Turinabol does not aromatizearomatizeThe body converting testosterone into estrogen via the aromatase enzyme.. Used without a testosterone base, estradiolestradiolThe main estrogen — needed in men too, and damaging in both directions when out of range. drops along with natural testosterone — do not add an aromatase inhibitoraromatase inhibitorA drug that blocks the conversion of testosterone to estradiol. on top.
Problem
Suppression of natural testosterone production
Countermeasure
Pronounced despite the moderate effect profile. A post-cycle plan belongs in place before starting; plan with the PCTPCTThe protocol after a cycle intended to restart the body's own testosterone production. timeline.
Problem
Elevated blood pressure
Countermeasure
Less pronounced than with wet orals, but worth tracking. Measure at home, keep cardio in the plan; medically, telmisartan, amlodipine or lisinopril, and low-dose tadalafil.
Overview
Turinabol has a history unlike any other anabolic steroid. It was developed in the GDR in the 1960s and administered systematically to athletes in the state doping programme, in many cases without their knowledge — including to minors. The long-term consequences documented in those affected are among the few sources of data on the effects of prolonged anabolic use outside a medical context.
Pharmacologically it sits between the wet and the dry orals. It produces no water retention, its effect is moderate rather than dramatic, and gains build correspondingly slowly.
Mechanism of Action
Turinabol is structurally methandienone with an added chlorine atom at position 4. This single modification changes the profile fundamentally: the chlorine atom prevents conversion by the aromatase enzyme, so no estradiol arises from it. Water retention and gynecomastia risk, the defining characteristics of methandienone, disappear entirely.
The 17-alpha-alkylation remains and with it the liver relevance, though moderate compared with oxymetholone or stanozolol. Binding to the androgen receptor is comparatively weak, which explains the modest effect.
One property is worth naming separately because it has practical consequences well beyond the cycle itself. Turinabol forms long-term metabolites that remain detectable in doping tests for an unusually long time. Retrospective reanalyses of stored samples from major competitions have produced positive results years after the fact, and turinabol featured prominently in those cases.
Typical Context
Turinabol is used where a dry, slow build is the goal — in definition phases or lean gaining phases, over six to eight weeks and generally alongside a testosterone base. Because it produces no water, weight gain is slower than with methandienone, but a correspondingly larger share of it remains after stopping.
The moderate effect is both its strength and its limitation. Side effects stay within a manageable range at conventional doses, but so does the result. Anyone expecting a dramatic effect will be disappointed; anyone looking for something controllable will find it fits.
Side Effects & Risks
- Severe drop in HDL, rise in LDL
- Liver strain from 17-alpha-alkylation, moderate but present
- Very long detection window in doping tests
- Estradiol too low without a testosterone base
- Suppression of natural testosterone production
- Elevated blood pressure, less pronounced than with wet orals
- Accelerated hair loss with a genetic predisposition
- Acne, oily skin
Blood Work & Monitoring
- Lipid profile (LDL, HDL, triglycerides) — the key value; baseline and during use
- Liver values (ALT, AST, GGT) — baseline and during use
- Total/free testosterone — to assess suppression
- Estradiol (sensitive) — watch for levels that are too low
- Blood pressure — measured at home
- Hematocrit & hemoglobin
Harm-Reduction Notes
- Unsuitable for anyone subject to doping controls — the detection window is exceptionally long
- Measure a lipid baseline before starting; the HDL drop is the main issue here
- Limit duration to 6–8 weeks
- Do not combine with other orals; liver strain is additive
- Avoid alcohol during use
- Do not add an aromatase inhibitor without measuring; without a testosterone base estradiol is already low
- A post-cycle plan is necessary despite the moderate effect profile
Legal status by region
Regulation differs considerably between jurisdictions and changes over time. This is a rough orientation, not legal advice — check the rules that apply where you are.
| Region | Regulatory status |
|---|---|
| United States | Schedule III controlled substanceNo approved human indication; distribution is a federal offence. |
| EU / UK | Not approved for human useSome compounds exist only as veterinary products or not at all. |
| Canada / Australia | Controlled substanceNo human indication. |
| Parts of Asia & Latin America | Grey market, largely unregulatedAvailability does not imply pharmaceutical quality — underground-lab product dominates. |
| Competitive sport | Prohibited at all timesListed by WADA. |