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Halotestin Tablets 5mg/tab 50 Tabletten by Genesis
Lab Tested

Halotestin Tablets 5mg/tab 50 Tabletten by Genesis

Fluoxymesterone — the 17α-methyl, 11β-hydroxy, 9α-fluoro derivative of testosterone — is a synthetic androgen whose defining biochemical characteristic is its exceptionally high-affinity binding to the androgen receptor (AR), classifying it among the most potent oral DHT-derived androgens in clinical and performance pharmacology. Each tablet delivers a precisely compressed 5 mg dose of fluoxymesterone API, giving users granular control over androgen receptor stimulation at the lowest available single-unit strength in this compound class. Quality assurance is structured around two independent checkpoints: HPLC quantification of the raw API against a certified fluoxymesterone reference standard, and an LAL-based endotoxin assessment on every released batch — all executed within Genesis GMP-certified production suites.

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  • Delivers direct, non-aromatisable androgen receptor activation — no oestrogen conversion pathway present
  • 5 mg per tablet enables step-wise receptor stimulation titration without tablet manipulation
  • Structural 9α-fluoro modification produces one of the highest documented oral androgen AR affinities
  • 17α-methyl group ensures meaningful systemic bioavailability after hepatic first-pass metabolism
  • 50-tablet count provides a full multi-week supply within a single, manageable unit
  • HPLC-quantified API concentration confirmed against certified reference standard per released batch
  • GMP-certified production environment with LAL endotoxin testing on every finished batch

Key takeaways

  • Understand fluoxymesterone's AR binding affinity before selecting your protocol.
  • Choose 5 mg tablets to titrate androgen receptor exposure in precise increments.
  • Expect zero oestrogenic activity due to structural aromatase resistance.
  • Confirm HPLC-verified potency from Genesis before committing to a cycle.
  • Schedule twice-daily dosing to maintain consistent receptor occupancy throughout the day.

Fluoxymesterone as a High-Affinity Androgen Receptor Agonist

Fluoxymesterone is a triply modified testosterone derivative — carrying a 9-fluoro substitution, an 11β-hydroxyl group, and a 17α-methyl group — whose structural configuration produces one of the highest androgen receptor relative binding affinities (RBA) recorded among orally active androgens, estimated at approximately 1,940 % relative to the reference standard methyltrienolone in competitive displacement assays. The androgen receptor binds fluoxymesterone with markedly greater affinity than it binds testosterone itself, a property that translates directly into potent transcriptional activation of androgen-responsive gene networks governing erythropoiesis, neuromuscular drive, and skeletal muscle contractile protein synthesis. Unlike testosterone, fluoxymesterone does not undergo meaningful aromatisation to oestrogen, because the 11β-hydroxyl and 9α-fluoro modifications sterically hinder CYP19A1 (aromatase) access to the A-ring — meaning androgenic effects occur without a parallel oestrogenic counterpart.

DHT-Derivative Lineage and Structural Consequences

Classified pharmacologically as a 17α-alkylated dihydrotestosterone (DHT) analogue, fluoxymesterone inherits the non-aromatisable backbone of DHT while gaining hepatic resistance through the C-17 methyl group. Compared to nandrolone — which carries a low androgenic-to-anabolic ratio near 37:125 — fluoxymesterone presents an inverted profile, with androgenicity predominating and clinical data supporting its historical medical application in aplastic anaemia and male hypogonadism. Genesis formulates fluoxymesterone at 5 mg per tablet across a 50-tablet pack, enabling dose titration that maps precisely to receptor-saturation kinetics without requiring tablet splitting.

Receptor Binding Kinetics and Oral Bioavailability

The 17α-methyl group confers first-pass hepatic resistance, allowing fluoxymesterone to reach systemic circulation intact and engage androgen receptors in target tissues — skeletal muscle, bone marrow, central nervous system — with a reported oral bioavailability that substantially exceeds non-alkylated androgens. Receptor occupancy drives downstream phosphorylation of androgen response elements (AREs) on DNA, initiating transcription of genes including those encoding myosin heavy chain isoforms and erythropoietin-stimulating factors. The half-life of fluoxymesterone, documented in pharmacokinetic studies at approximately 9–10 hours, supports twice-daily dosing intervals that maintain consistent AR occupancy across a 24-hour cycle without supraphysiological peak-and-trough swings.

Usage

  1. Verify the tablet marking and batch documentation prior to use — confirm HPLC-certified potency aligns with the declared 5 mg per tablet on the packaging.
  2. Divide your daily dose into two equal administrations spaced approximately 10–12 hours apart, reflecting the fluoxymesterone half-life of roughly 9–10 hours to maintain sustained AR occupancy.
  3. Swallow tablets whole with a full glass of water; do not crush or dissolve, as the 17α-methyl group's stability is optimised in the intact compressed tablet matrix.
  4. Administer doses with or immediately after food to support gastric tolerability and modulate peak plasma concentration rise-rate, reducing the likelihood of acute androgenic receptor over-stimulation symptoms.
  5. Log each dose against a daily tracker and schedule ALT/AST hepatic enzyme blood panels at baseline, mid-cycle, and post-cycle — the 17α-alkylation pathway places a defined burden on hepatic CYP metabolism that requires active monitoring.
  6. Initiate PCT (e.g., Clomiphene or Tamoxifen) no later than 24–48 hours after the final tablet, consistent with the compound's documented clearance kinetics, to restore endogenous androgen axis function promptly.

Warnings

Contraindications: Fluoxymesterone is contraindicated in individuals with pre-existing hepatic impairment, diagnosed or suspected androgen-sensitive malignancy (prostate or breast), hypercalcaemia, nephrotic syndrome, or known hypersensitivity to any fluorinated steroid compound. Women of childbearing potential must not use this compound due to irreversible virilisation risk documented in clinical literature.

Side Effects: The high androgen receptor affinity of fluoxymesterone generates a correspondingly potent androgenic side-effect profile: accelerated androgenic alopecia in genetically predisposed users, sebaceous gland hyperactivity (acne), and marked suppression of the hypothalamic-pituitary-gonadal (HPG) axis detectable within days of initiation. Hepatotoxicity — characterised by elevated ALT, AST, and in prolonged use, cholestatic jaundice — is a class-specific risk of 17α-alkylated androgens. Polycythaemia (elevated haematocrit) may develop due to erythropoietic AR stimulation in bone marrow.

Monitoring: Baseline and on-cycle liver function panels (ALT, AST, bilirubin, ALP) are mandatory — schedule at Day 0, Week 2, and end-of-cycle. Haematocrit and haemoglobin should be measured at the same intervals given fluoxymesterone's documented erythropoietic activity. Lipid profiles (LDL/HDL ratio) require monitoring, as potent androgens suppress HDL cholesterol via hepatic lipase induction.

PCT: Due to rapid and pronounced HPG axis suppression attributable to strong AR-mediated negative feedback, post-cycle therapy must begin within 24–48 hours of the last dose. A SERM-based protocol — typically Clomiphene 50 mg/day for 4 weeks or Tamoxifen 20 mg/day for 4–6 weeks — is indicated to restore endogenous LH and FSH signalling. HCG may be incorporated in the final week of the active cycle to preserve Leydig cell sensitivity prior to SERM initiation.

Frequently asked questions

How does fluoxymesterone bind to the androgen receptor compared to testosterone?
Fluoxymesterone binds the androgen receptor with a relative binding affinity estimated at approximately 1,940 % of the methyltrienolone reference standard — substantially exceeding testosterone's AR affinity. This is attributable to its 9α-fluoro and 11β-hydroxy substitutions, which optimise the molecule's three-dimensional fit within the AR ligand-binding domain, producing a stronger and more sustained transcriptional activation signal per unit dose.
What does fluoxymesterone's DHT-derivative chemical lineage mean for its physiological effects?
Being a DHT-derived compound, fluoxymesterone cannot be converted to oestrogen by the CYP19A1 aromatase enzyme. This means all receptor-mediated effects — erythropoietic stimulation, neuromuscular drive, myofibrillar protein transcription — occur without a concurrent oestrogen rise, making the androgenic activity 'clean' in the hormonal sense. The 17α-methyl group further distinguishes it from parent DHT by granting oral bioavailability through hepatic first-pass resistance.
Why does fluoxymesterone's androgen receptor affinity differ so significantly from other oral androgens?
The combination of three structural modifications — the electron-withdrawing 9-fluoro group, the 11β-hydroxyl, and the 17α-methyl — creates a molecular geometry that fits the AR ligand-binding pocket with exceptional complementarity. Each modification contributes independently: the fluoro group stabilises the A-ring conformation, the hydroxyl adds a hydrogen-bonding contact point, and the methyl group prevents rapid hepatic clearance, collectively producing a receptor interaction profile that is rare among clinically documented oral androgens.
Why is the 5 mg tablet strength a practical advantage for precise androgen receptor dosing protocols?
At 5 mg per tablet — the lowest single-unit strength in the fluoxymesterone format — users can titrate their androgen receptor exposure in discrete 5 mg increments without splitting tablets or approximating doses. This granularity is particularly relevant given fluoxymesterone's steep dose-response curve at the receptor level; small dose adjustments produce measurably different AR saturation outcomes, making the 5 mg unit a pharmacologically meaningful increment rather than an arbitrary convenience.
How are Genesis Halotestin 5 mg tablets verified for accurate fluoxymesterone content?
Each batch of Genesis Halotestin 5 mg tablets undergoes HPLC quantification referenced against a certified fluoxymesterone primary standard, confirming that per-tablet API content meets declared potency within validated acceptance criteria. An LAL (Limulus Amebocyte Lysate) endotoxin test is conducted on finished batches, and the entire manufacturing process runs within GMP-certified production suites subject to ongoing environmental monitoring. (2) angle_used

Manufacturer

Genesis enters the fluoxymesterone category with a manufacturing posture shaped entirely by the compound's pharmacological specificity: because fluoxymesterone exerts its effects through androgen receptor binding at sub-milligram-per-kilogram concentrations, tablet-to-tablet dose uniformity is not a convenience feature but a pharmacodynamic requirement. A ±10 % deviation in API content at the 5 mg dose level represents a full 0.5 mg swing — sufficient to shift receptor occupancy in a clinically meaningful direction. To address this, Genesis subjects the incoming fluoxymesterone API to identity confirmation and quantitative purity assessment before the material is authorised to enter the compression stage; a separate finished-tablet HPLC assay — run against a certified fluoxymesterone reference standard — provides the second, independent potency confirmation required for batch release. The 50-tablet oral solid format is packaged within a format validated for stability under recommended storage conditions, protecting the 17α-methyl group's structural integrity across the product's declared shelf-life. Genesis's broader oral androgen portfolio — spanning 17α-alkylated compounds across multiple strength categories — means the quality infrastructure supporting this fluoxymesterone line benefits from accumulated process knowledge specific to alkylated steroid compression, rather than being purpose-built for a single product.

Product details

BrandGenesis
Active ingredientfluoxymesterone
Also known asHalotestin, Halo, Fluoxymesteron, Halotestin Tablets, Genesis Halotestin
Strength5 mg
FormTabletten
Pack size50 pieces
Item numberORA-FLUO-GES-001

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