What it is
Trenbolone is a veterinary steroid originally designed for use in cattle to increase muscle mass before slaughter. It was never approved for human use. It is available as Trenbolone Acetate (short ester, most common), Trenbolone Enanthate (longer ester), and Trenbolone Hexahydrobenzylcarbonate (Parabolan). It is approximately five times more anabolic and androgenic than testosterone.
What it does
Trenbolone dramatically increases protein synthesis, nitrogen retention, and IGF-1 production. It does not aromatise (convert to oestrogen), which means no water retention, giving a hard, dry appearance. It also increases red blood cell production and nutrient efficiency (the body extracts more from the same amount of food). The results can be dramatic, which is why it remains popular despite its risks.
Typical dosages
Trenbolone Acetate: 150–300mg per week is commonly reported. Some users go much higher, but side effects scale dramatically with dose. Many experienced harm reduction advocates recommend against using trenbolone at all, particularly for anyone under 25 or with less than several years of training and cycling experience.
These figures reflect commonly reported usage in harm reduction communities. They are not recommendations. There is no safe dose of anabolic steroids for non-medical use. Start low and monitor your health through blood work.
Side effects
- Severe insomnia (the 'tren insomnia' is well-documented)
- Intense night sweats
- Extreme mood changes: anxiety, paranoia, aggression, irritability
- Cardiovascular strain, more severe than most other compounds
- Severe suppression of natural testosterone (requires a testosterone base)
- Tren cough (a brief but intense coughing fit after injection)
- Reduced cardiovascular endurance
- Dark-coloured urine
- Sexual side effects: can increase libido dramatically or cause dysfunction
Specific risks
- Cardiovascular: trenbolone is particularly harsh on the cardiovascular system. It significantly raises blood pressure and has a severe impact on cholesterol
- Neurological: tren crosses the blood-brain barrier and can cause significant psychological effects including paranoia, anxiety, and aggressive behaviour
- Kidney strain: the dark urine associated with tren is oxidised metabolites, but the compound does place additional strain on the kidneys
- No human safety data: this was designed for cattle. There is no clinical data on safe human use because there is none
- Respiratory: can cause significant reduction in cardiovascular capacity
What to watch for
- Changes in your behaviour noticed by others (you may not notice them yourself)
- Inability to sleep more than a few hours
- Persistent anxiety or paranoid thoughts
- Blood pressure above 140/90
- Difficulty breathing during exercise that was previously manageable
- Relationship problems that began after starting tren
Other compounds
Testosterone
Lower/Moderate RiskThe base of almost every steroid cycle. Testosterone is the primary male sex hormone and the most commonly used anabolic steroid.
Anavar (Oxandrolone)
Lower/Moderate RiskOften considered one of the 'milder' oral steroids. Popular among beginners and women. Still carries real risks, particularly to cholesterol and liver values.
Dianabol (Methandrostenolone)
Higher RiskOne of the oldest and most popular oral steroids. Known for rapid mass and strength gains, but with significant water retention and liver strain.