1. Basic Physical & Chemical Parameters

Item	Parameter
CAS No.	10418-03-8
EINECS No.	233-897-6
Molecular Formula	C₂₁H₃₂N₂O
Molecular Weight	328.50
Melting Point	229℃ – 232℃
Appearance	White crystalline powder

2. General Product Usage

Stanozolol (Winstrol) is a highly popular anabolic steroid for bodybuilders and athletes during cutting phases and pre-contest preparation. It is well-known for boosting muscle hardness, muscle density and vascularity without causing water retention. Most competitive bodybuilders add Stanozolol to pre-contest stacks to achieve a shredded, dry and vascular physique.

3. Product Characteristics

Stanozolol (commonly known as Winstrol) is a DHT-derived anabolic steroid available in both oral and injectable forms. It features strong anabolic activity with low androgenic properties and does not aromatize into estrogen. This completely eliminates the risk of estrogenic side effects such as gynecomastia and excessive water retention, making it ideal for estrogen-sensitive athletes. However, the oral version is a 17α-alkylated compound with obvious hepatotoxicity.

For female athletes, low-dose Stanozolol is tolerable for physique shaping, though it carries a slightly higher virilization risk compared to Anavar. As a fast-acting steroid, it allows easy control of blood hormone levels. If any side effects occur, steroid concentrations decline rapidly in a short time. It is also widely used in track and field sports to enhance strength and speed without excess weight gain.

4. Core Product Applications & Risk Warnings

4.1 Muscle Hardening, Definition & Fat Loss

Stanozolol effectively eliminates subcutaneous water retention, creating a dry, polished and defined muscle appearance. It accelerates protein synthesis and nitrogen retention while inhibiting glucocorticoid catabolism, effectively preventing muscle wasting during calorie-deficit cutting cycles. Additionally, it reduces SHBG levels in the body, increasing the concentration of free active testosterone to further optimize training effects and body composition.

4.2 Hepatotoxicity & Lipid Profile Risks

Free of estrogenic activity, Stanozolol completely avoids water retention and gynecomastia. However, it has a severe negative impact on blood lipids, significantly reducing beneficial HDL cholesterol and elevating harmful LDL cholesterol. Its 17α-alkylated molecular structure also brings strong liver toxicity. For safety reasons, the cycle length is strictly limited to 4–6 weeks. Most bodybuilders use liver support supplements during Stanozolol cycles to reduce organ burden.