Description

Technical Parameters

Introduction

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product-1400-1400

Products Description

#### 1. Chemical structure and basic properties

**Chemical name**: Methenolone Acetate

**Alias**: Methenolone Acetate, Primobolan Acetate

**CAS number**: 434-05-9

**Molecular formula**: C22H32O3

**Molecular weight**: 344.49 g/mol

**Structural features**:

- It is a 1-methylated dihydrotestosterone (DHT) derivative, with 1-methyl and 3-keto groups introduced on the basis of DHT structure, and an acetate group added at the 17β position.

- Esterification delays drug release, but acetate hydrolysis is fast, the half-life is short, and frequent administration is required.

**Physical properties**:

- Appearance: White to off-white crystalline powder.

- Solubility: slightly soluble in water, easily soluble in organic solvents (such as ethanol, chloroform).

#### 2. Pharmacological action and mechanism

**Mechanism of action**:

- **Androgen receptor agonist**: binds to intracellular androgen receptors to promote protein synthesis and muscle growth.

- **Anti-catabolism**: inhibits cortisol activity and reduces muscle breakdown.

**Pharmacokinetics**:

- **Absorption**: oral bioavailability is high (acetate form can be taken orally), and injection administration is absorbed faster.

- **Half-life**: about 2-3 days (acetate hydrolyzes rapidly and needs to be administered daily or every other day).

- **Metabolism**: hydrolyzed by the liver into active metabolite Methenolone, excreted in urine.

**Active characteristics**:

- **Anabolic/androgenic ratio**: 4:1, significantly higher than testosterone, with significant muscle growth effect and low masculinization side effects.

#### 3. Application fields

**Medical use**:

- **Muscle atrophy treatment**: used for cachexia and postoperative recovery in cancer and HIV patients.

- **Osteoporosis**: promotes bone density increase, but clinical application is limited.

- **Child growth retardation**: historically used to promote development, but now used less due to side effects.

**Sports and bodybuilding**:

- **Muscle building and body shaping**: low water retention properties are conducive to maintaining muscle lines, often used in the preparation period.

- **Female applicability**: the risk of masculinization is low, but there are still potential side effects such as voice changes.

#### 4. Advantages and characteristics

- **Low hepatotoxicity**: 1-methylated structure avoids 17α alkylation, reducing the burden on the liver.

- **Mild side effects**: less likely to cause acne, hair loss or aggressive behavior.

- **Oral effectiveness**: the acetate form can be taken orally to avoid the inconvenience of injection.

- **Antiestrogen effect**: does not aromatize into estrogen, no risk of breast development.

**Comparative advantages**:

- Compared with strong steroids such as Dianabol, Primobolan is more suitable for long-term mild muscle gain.

- Compared with Stanozolol, it has less joint pressure and is suitable for people with sensitive joints.

#### 5. Side effects and risks

**Common side effects**:

- **Masculinization effect**: Women may experience increased body hair and menstrual disorders.

- **Blood lipid effects**: Lower HDL and increase cardiovascular risk.

- **Endocrine suppression**: Long-term use inhibits endogenous testosterone secretion and requires PCT (post-cycle therapy).

**Contraindications**:

- Prostate cancer and breast cancer patients are prohibited; pregnant and lactating women are contraindicated.

#### 6. Legality and supervision

- **Medical control**: Most countries list it as a prescription drug and require strict supervision.

- **Sports ban**: The World Anti-Doping Agency (WADA) has banned it, and urine tests can detect metabolites.

- **Black market circulation**: Common in the bodybuilding black market, with high purity and safety risks.

#### 7. Production process and quality control

**Synthesis route**:

1. Using dehydroepiandrosterone (DHEA) as raw material, it is prepared by methylation, oxidation, and esterification.

2. The key steps include 1-methyl introduction and acetic acid esterification, which require high-purity intermediates.

**Quality standards**:

- **Purity requirements**: HPLC detection purity ≥98%.

- **Impurity control**: Related substances (such as unreacted raw materials) ≤1%.

#### 8. Market status and suppliers

- **Major manufacturers**: Chinese and Indian API manufacturers dominate global supply.

- **Price trend**: About $2000-$3000/kg, affected by regulations and demand fluctuations.

- **Supply chain risks**: Products from illegal channels are often adulterated with fillers and require strict certification.

### Conclusion

Methenolone Acetate has a place in both the medical and sports fields due to its unique chemical structure and pharmacological properties. However, the health risks and legal issues caused by its abuse cannot be ignored. Future research may focus on optimizing its therapeutic window and developing safer analogs to balance efficacy and safety.