What Is Turinabol (Tbol)? The Complete UK Guide (2026)

Turinabol (4-chlorodehydromethyltestosterone, commonly called “Tbol”) is perhaps the most historically significant anabolic steroid in competitive sports — it was the compound at the heart of the East German state doping programme that dominated Olympic athletics from the 1970s to the 1980s. Its appeal for performance athletes remains clear: it produces lean, quality gains without water retention, does not aromatise, and is significantly milder in terms of androgenic side effects than Dianabol, to which it is structurally related. This guide covers its complete pharmacology and performance application.

What Is Turinabol?

Turinabol is a synthetic oral anabolic steroid derived from Dianabol (methandrostenolone) with the addition of a 4-chloro substitution. This modification accomplishes two things: it prevents aromatisation to oestrogen (making Tbol a non-aromatising compound) and reduces its androgenic potency relative to Dianabol. It was developed by Jenapharm in East Germany and used systematically in the East German Olympic doping programme known as State Plan 14.25 from the 1970s through to 1989.

Like Dianabol and most oral anabolic steroids, Turinabol is C-17 alpha-alkylated, making it hepatotoxic — the degree of liver stress is significantly lower than Dianabol or Anadrol but real and requiring management.

Anabolic:Androgenic Ratio

Turinabol's anabolic:androgenic ratio is approximately 53:6 — a very low androgenic rating compared to its anabolic activity. This makes it one of the more favourable oral anabolic steroids in terms of the anabolic-to-androgenic split, though its absolute anabolic potency per milligram is lower than Dianabol.

How Turinabol Works: Key Mechanisms

Non-Aromatising Anabolic

The 4-chloro modification prevents Turinabol from aromatising to oestrogen. This distinguishes it fundamentally from Dianabol, which aromatises significantly. The result: no oestrogen-driven water retention, no gynaecomastia risk from Turinabol itself, and no need for an AI when running Tbol as a standalone compound. When stacked with aromatising injectables (testosterone), AI use remains necessary for the testosterone component.

SHBG Binding

Turinabol has a strong affinity for SHBG, similar to Masteron. This increases free testosterone bioavailability when co-administered with testosterone-based injectables, amplifying the effective anabolic signal from the stacked compound.

Lean Mass and Strength Without Water Retention

Tbol produces steady, dry gains in lean mass and strength. The absence of water retention means that mass gained on Turinabol more accurately represents lean tissue than gains on Dianabol. Strength gains are real but slower and less dramatic than with Dianabol or Anadrol — users describe the strength from Turinabol as “cleaner” and more permanent.

Turinabol vs Dianabol: Key Differences

Property	Turinabol	Dianabol
Aromatisation	None (4-chloro modification)	Significant
Water retention	None	Significant
Strength gain speed	Gradual	Rapid
Gain quality	Lean, dry, keepable	Rapid but partly water/glycogen
Androgenic side effects	Low	Moderate
Hepatotoxicity	Moderate (C-17aa)	Moderate (C-17aa)
AI required	Not for Tbol itself	Yes
Detection window (blood)	Up to 40–50 days (long-term metabolite)	~5–6 weeks urine

Dosage and Cycle Guidance

Turinabol's typical performance dose is 40–80 mg/day for men over 6–8 week cycles. Lower doses (20–40 mg/day) are sometimes used as a less aggressive stack addition. The East German programme used doses as low as 5–10 mg/day in some athletes, demonstrating meaningful effects at sub-clinical doses — though these very low doses took advantage of long-term accumulated exposure rather than acute cycle-style use.

Typical usage patterns:

• Kickstart to injectable cycle: 40–60 mg/day for weeks 1–6 while a long-ester injectable reaches stable blood levels. Provides lean gains without the water-retention kickstart of Dianabol.
• Cutting cycle addition: 40–60 mg/day alongside a cutting injectable (Testosterone Propionate + Masteron or Primobolan) for lean mass preservation and strength maintenance.
• Women: 5–15 mg/day; one of the more commonly used oral compounds for female athletes due to low androgenic rating. Monitor for virilisation closely.

Liver support with TUDCA (500 mg/day) and NAC (1200 mg/day) is required throughout oral use. See our oral steroids liver protection guide and browse available Turinabol products.

Side Effects Overview

• Hepatotoxicity: C-17aa; liver enzyme elevation is expected but generally lower severity than Anadrol or Dianabol. LFT monitoring required.
• Lipid disruption: HDL suppression is significant. Comparable to Dianabol per milligram.
• HPG suppression: Turinabol suppresses LH/FSH; PCT required after all Tbol cycles.
• Androgenic effects: Low due to the 4-chloro modification reducing androgenic potency. Hair loss risk much lower than Dianabol at equivalent doses.
• No water retention: A true advantage over most oral mass-building compounds.

See our PCT guide for full post-cycle protocols.

UK Legal Status

Turinabol (4-chlorodehydromethyltestosterone) is a Class C controlled substance. See our UK law guide.

Frequently Asked Questions

Is Turinabol good for beginners?

Turinabol is one of the more appropriate oral anabolic steroids for users who have completed a testosterone-only cycle and want to add an oral kickstart or lean-gains compound. Its low androgenic profile and absence of oestrogen-related side effects make it more manageable than Dianabol for users sensitive to oestrogenic effects. However, it is not a first-ever-cycle compound — testosterone-only remains the appropriate starting point.

Why does Turinabol have such a long detection window?

Turinabol's long-term metabolite (4-chloro-17a-methyl-androsta-1,4-dien-3-one) has a detection window in urine of 40–50 days in standard testing, and long-term metabolites have been detected months after use in some studies. This was not discovered until after the East German programme ended, which is why their doping went undetected at the time. Athletes subject to anti-doping testing should be aware that Turinabol has one of the longest detection windows of any oral anabolic steroid.