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CAS 76-43-7 Bodybuilding Supplement Fluoxymesterone For Muscle Growth

Product Name: Fluoxymesterone
Synonym:  Fluoxymesterone, Halotestin
EINECS : 200-961-8
CAS No: 76-43-7
Melting point: 240 °C
Assay: 99%
Molecular Formula: C20H29FO3
Molecular Weight: 336.441g/mol
Place of Origin: China


Fluoxymesterone is an oral anabolic steroid derived from testosterone. More specifically, it is a methyltestosterone derivative, differing by the addition of 11-beta-hydroxy and 9-alpha-fluoro groups. The result is a potent orally active non-aromatizable steroid that exhibits extremely strong androgenic properties. Fluoxymesterone is considerably more androgenic than testosterone, while at the same time the anabolic effects of this agent are considered to be moderate in comparison. This makes fluoxymesterone a great strength drug, but not the most ideal agent for gaining muscle mass. The predominant effects seen when taking fluoxymesterone are increased strength, increased muscle density, and increased definition, with only modest size increases.

Halotestin a Steroid?

Halotestin is a testosterone derived steroid, and has an 11-beta group attached to it to inhibit aromatization, although it is particularly prone to being 5-alpha-reduced and may cause DHT related side effects, such as acne and hair loss. It is metabolized primarily by 6 beta-hydroxylation, 4-ene-reduction, 3-keto-reduction, and 11-hydroxy-oxidation (3). We know this by the identification of 4 particular metabolites and the tentative identification of at least 3 other metabolites. Detection of Halo in urine is possible for at least 5 days after a single 10 mg oral dose to previously untreated adult males, by monitoring the presence of 2 metabolites, since the parent drug is not detectable more than 1 day after the dose (11). However, the moral-compass of the athletic world, the IOC, has developed a test for fluoxymesterone metabolites that will detect them for up to 2 months after cessation of use.

Halotestin is not in high demand in bodybuilding except for as a pre-contest drug, and would more likely be found circulating in Athletic and Powerlifting circles, where it is more commonly used in a cycle.

How Supplied:

Fluoxymesterone is available in select human drug markets. Composition and dosage may vary by country and manufacturer,although generally contain 2mg, 2.5 mg, 5 mg, or 10 mg per tablet.


Structural Characteristics:

Fluoxymesterone is a modified form of testosterone. It differs by 1) the addition of a methyl group at carbon 17-alpha, which helps protect the hormone during oral administration, 2) the introduction of a fluoro group at carbon 9 (alpha) and 3) the attachment of a hydroxyl group at carbon 11 (beta), which inhibits steroid aromatization. The latter two modifications also greatly enhance the androgenic and relative biological activity of the steroid over 17-alpha methyltestosterone