Halotestin (Fluoxymesterone)
Extremely potent oral AAS. 17-alpha alkylated. Used for strength and aggression in powerlifting and pre-contest hardening. Not a mass builder.
Overview
Extremely potent oral AAS. 17-alpha alkylated. Used for strength and aggression in powerlifting and pre-contest hardening. Not a mass builder.
Severe liver stress (one of the most hepatotoxic common orals), significantly elevates ALT/AST/GGT, dramatically worsens lipids, does not aromatise, strong HPTA suppression, can elevate haematocrit, increases aggression
Compound Guide
Structure: 17-alpha alkylated, 9-fluoro, 11-beta-hydroxy testosterone derivative. Extremely androgenic (1900:1 androgenic:anabolic ratio on paper).
Dosage:
- Strength / pre-workout: 10-20mg taken 30-60 min before training
- Pre-contest: 20-30mg/day for 2-4 weeks maximum
- Advanced: 30-40mg/day (extreme liver toxicity — not recommended beyond 2-3 weeks)
Administration:
- Oral tablet, take pre-workout or split AM/pre-workout
- NEVER exceed 4-6 weeks of continuous use
Key Notes:
- Used almost exclusively for strength, aggression, and contest-day hardening — not a mass builder
- One of the most hepatotoxic oral AAS — liver values can spike dramatically within days
- Keep cycles very short (2-4 weeks) with mandatory liver support: TUDCA 500-1000mg/day, NAC 1.5g/day
- Monitor liver enzymes weekly during use if possible
- Does not aromatise — no estrogen management needed
- Dramatically worsens lipids — HDL can drop to single digits
- Not suitable for beginners under any circumstances
Usage History
Markers to Monitor
Marker Interactions
Frequently Asked Questions
Related Articles
On-Cycle Support Protocol: Every Supplement Mapped to Your Bloodwork
Evidence-based on-cycle support protocol with every supplement mapped to the blood markers it protects. Dosing, timing, and protocols by cycle type.
Best Cholesterol Supplements On Cycle, Ranked by Evidence (2026)
We ranked every cholesterol supplement by clinical effect size for steroid users: bergamot, fish oil, niacin, berberine, red yeast rice, and more. Exact doses, HDL vs LDL targets, and when a statin is the smarter call.
Cholesterol on Steroids: Which Compounds Destroy HDL the Most?
Oral steroids can crush HDL by 50-70% in weeks. Compound-by-compound rankings from clinical data, recovery timelines after stopping, and a tiered lipid management protocol for on-cycle use.
Liver Enzymes on Steroids: How to Read Your ALT, AST and GGT
How to interpret elevated liver enzymes on a steroid cycle. Learn the GGT trick, compound hepatotoxicity rankings, and when to worry.
Quick Reference
Category
AAS
Half-Life
6-8 hours
Detection Time
2 months