Fluoxymesterone (Fluoxymesterone (Halotestin))
A very potent oral androgen (Halotestin) prescribed historically for hypogonadism and breast cancer, known non-medically for dramatic strength and aggression increases without added mass. Educational reference only.
How it works
A 17-alpha-alkylated, fluorinated derivative of methyltestosterone with extremely high androgenic potency. It boosts strength, aggression, and red blood cells rapidly but does little for muscle size.
Key facts
- Molecular weight: 336.4 Da
- Half-life: ~9 hours
- Bioavailability: Oral
- Storage: Room temperature; keep dry.
Dosing overview
- Typical dose: Medical: ~2.5-20 mg/day
- Frequency: Daily
- Duration: Very short courses
- Route: Oral tablet
Protocol notes
- Medically dosed for hypogonadism or breast cancer under supervision.
- Non-medically used briefly for strength/aggression peaks (e.g. before competition).
- Extremely hepatotoxic; only very short courses.
Reported benefits
- Rapid strength gains
- Increased aggression/drive
- Red blood cell stimulation
- No added water weight
Possible side effects
- Severe liver toxicity
- Aggression/mood changes
- Adverse lipids
- Testosterone suppression
- Androgenic effects
Research
- Fluoxymesterone potency (2014): Exhibited high androgenic potency and strength effects, with significant hepatotoxicity limiting use.
Community reviews of Fluoxymesterone
- data_driven_dan rated it 5/5 - Worth adding to the protocol: Fluoxymesterone has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.
- longevity_anna rated it 4/5 - Genuinely effective after 1 month: Been using Fluoxymesterone for about 1 month and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- peak_levels_paula rated it 4/5 - Noticed clear benefits within weeks: Added Fluoxymesterone to my protocol about 6 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
Compare Fluoxymesterone
Research and educational reference only. Not medical advice.