Stanozolol, best known as Winstrol, became famous for the wrong reasons: the 1988 Olympic 100-metre final made it a household name. Before that it was a medicine for a rare swelling disorder. Today it is associated with cutting, a hard look and some of the harshest effects on cholesterol of any anabolic steroid.
- Stanozolol is a DHT derivative with a pyrazole ring, active both by mouth and by injection.
- Its medical use was hereditary angioedema: the label started at 2 mg three times a day, then tapered to the lowest amount that prevented attacks.
- It does not convert to estrogen and lowers SHBG, which raises free hormone levels.
- It is notably hard on HDL cholesterol and, in oral form, on the liver.
Medical history
Stanozolol was introduced in the early 1960s. Its lasting medical role was preventing attacks of hereditary angioedema, a genetic condition causing sudden swelling of the face, airway and gut. It raised levels of a protein those patients lack. Newer targeted treatments have since replaced it, and it is no longer a routine pharmacy product in Canada.
Tablets and injection
Unusually, stanozolol is used both orally and as an injectable water-based suspension rather than oil. The oral form is 17-alpha-alkylated, which lets it survive the liver but strains it. The injectable form avoids the first pass through the liver but carries its own issues: the crystals in the suspension can make injections painful, and frequent injections are needed because it is not esterified.
Why it is linked to cutting
Stanozolol cannot become estrogen, so it causes no water retention through that route. It also lowers sex hormone-binding globulin, so more of whatever testosterone is present is free and active. In lean people, the result is often a drier, more defined appearance without much weight gain, which is why it is associated with the end of a diet.
Side effects
Cholesterol
Stanozolol is among the strongest suppressors of HDL cholesterol. Studies in healthy men showed HDL falling by a third or more within weeks, with LDL rising. This is one of its most significant long-term risks. See our guide to steroids and cholesterol.
Liver
The oral form raises liver enzymes in many users. Rare but serious problems include cholestatic jaundice and liver tumours with prolonged use.
Joints and tendons
Many users describe dry, achy joints. Whether stanozolol directly harms connective tissue is debated, but a stronger muscle pulling on tendons that have not adapted is a recognised route to injury. Our article on tendons and joints covers this.
Hair, skin and suppression
As a DHT derivative it can speed up hair loss and cause acne, and it suppresses natural testosterone like other anabolic steroids.
Despite its reputation as a “women’s steroid”, stanozolol is strongly androgenic and voice changes can be permanent. Stop at the first sign of hoarseness.
SHBG in plain language
Most testosterone in the blood is bound to sex hormone-binding globulin, a carrier protein, and only a small free fraction acts on tissues. Stanozolol lowers SHBG noticeably, so more of the hormone circulating is free. That partly explains why it is said to make other compounds feel stronger. It also means a standard total testosterone test can look normal while free levels are high, so a free testosterone measurement gives a clearer picture.
Who should avoid stanozolol
Anyone with existing liver disease, high cholesterol, heart disease, a history of tendon injury or a family history of early heart attacks has strong reasons not to use it. The same applies to people taking blood thinners, because anabolic steroids can increase their effect, and to anyone planning a family in the near future.
Bloodwork to discuss with a doctor
A lipid panel before and during use is the most important. Liver enzymes (ALT, AST, GGT, bilirubin), blood pressure, hematocrit and testosterone complete the picture.
Genetix Pharma, 20 mg x 50Winstrol (Stanozolol) TabletsView product
Legal status in Canada
Stanozolol is a Schedule IV anabolic steroid. Importing, exporting and trafficking are offences under the Controlled Drugs and Substances Act; simple possession of Schedule IV substances is not. General information only.
Frequently asked questions
Is oral Winstrol harder on the liver than injectable?
Generally yes, because the oral form passes through the liver first. Injectable stanozolol still affects cholesterol and is still processed by the liver.
Why do my joints ache on Winstrol?
Many users report it, and the cause is not fully understood. Persistent joint or tendon pain is a reason to stop heavy loading and see a doctor.
Does Winstrol burn fat?
Not directly. It may help preserve muscle while dieting, and its lack of water retention changes how lean someone looks.
Educational information only. Nothing here is medical advice or a recommendation to use any product. Anabolic steroids are Schedule IV under the Controlled Drugs and Substances Act. Talk to a doctor and get bloodwork before and after using any compound.
