Epistane is a synthetic anabolic steroid that was sold as a “prohormone” or dietary supplement in the United States before being classified as a Schedule III controlled substance. Its chemical name is 2α,3α-epithio-17α-methyl-5α-androstan-17β-ol. Despite the supplement-style marketing it received for years, epistane is a methylated oral steroid that binds to androgen receptors and carries real risks, particularly to the liver.
How Epistane Works
Epistane activates androgen receptors in muscle tissue, triggering the same protein-building pathways as testosterone and other anabolic steroids. It’s a derivative of dihydrotestosterone (DHT), which means it promotes lean, dry-looking muscle gains without significant water retention. Users in bodybuilding circles historically favored it during cutting phases for this reason.
One property that set epistane apart from many other steroids is its reported anti-estrogenic activity. Because it doesn’t convert to estrogen in the body, users are less likely to experience side effects like breast tissue growth or bloating that come with compounds that do. This dual action, building muscle while keeping estrogen low, made it popular as a standalone compound.
Why It’s Now Illegal in the US
Epistane is explicitly listed as a controlled substance under the Designer Anabolic Steroid Control Act of 2014, which expanded the Controlled Substances Act to cover dozens of synthetic steroids that had been marketed through legal loopholes. It’s classified as a Schedule III substance alongside traditional anabolic steroids like testosterone and nandrolone. Possessing or selling it without a prescription is a federal crime. The World Anti-Doping Agency also prohibits it in competitive sports.
Before the law caught up, epistane was widely available online and in supplement shops, often packaged in capsules with dosing instructions as though it were a vitamin. That accessibility gave many people the false impression it was safe or fundamentally different from “real” steroids. It is not.
Liver Damage Is the Primary Risk
Epistane is a 17-alpha methylated steroid, meaning it has been chemically altered to survive passing through the liver when taken orally. This modification is what makes it effective as a pill, but it also forces the liver to process a compound it struggles to break down safely.
Research published in the journal Toxicology Letters found that epistane causes cholestasis, a condition where bile flow from the liver is blocked or severely reduced. In lab studies using human liver cells, epistane increased the accumulation of bile acids inside those cells by 50 to 70 percent. It did this by activating androgen receptors in the liver, which in turn ramped up production of an enzyme (CYP8B1) responsible for bile acid synthesis. The result: too much bile building up in liver cells with no efficient way out.
Cholestasis can cause jaundice (yellowing of the skin and eyes), severe itching, dark urine, pale stools, and abdominal pain. In serious cases it can progress to liver failure. The researchers noted that the severity of this reaction varies widely between individuals because people have different baseline levels of bile-processing enzymes and transport proteins. This makes epistane’s liver toxicity somewhat unpredictable: one person might use it without obvious symptoms while another develops jaundice within weeks.
Other Side Effects
Beyond the liver, epistane produces the same category of side effects as other anabolic steroids. Because it’s a DHT derivative, it can accelerate hair loss in people genetically predisposed to male pattern baldness. Acne, oily skin, and joint dryness are commonly reported. The joint dryness is particularly notable because epistane doesn’t cause water retention, and some of that retained water in other steroid cycles actually cushions joints.
Epistane suppresses the body’s natural testosterone production. Your pituitary gland detects the incoming androgen and dials back its signals to the testes, reducing or halting their output of testosterone. The longer and higher the dose, the more complete that shutdown tends to be. After stopping, it can take weeks or months for natural production to recover, during which users often experience fatigue, low libido, mood changes, and muscle loss.
Like other oral steroids, epistane typically shifts cholesterol in an unfavorable direction, lowering HDL (the protective kind) and raising LDL. This effect is temporary but creates cardiovascular strain during and shortly after use.
How People Used It
When epistane was still available, common cycles ran four to six weeks. A typical “competition” protocol started at 30 mg per day in the first week, increased to 45 mg for weeks two and three, and peaked at 60 mg in the final week. A more conservative cutting cycle began at just 15 mg daily and gradually climbed to 45 mg over six weeks before tapering back down. Capsules were usually dosed at 15 mg and split across morning and evening.
After finishing a cycle, users were advised to run a recovery protocol for at least four weeks. The goal was to restart natural testosterone production and support liver regeneration. Common recovery supplements included ingredients like N-acetyl cysteine for liver support and D-aspartic acid to stimulate testosterone. Because epistane itself suppresses estrogen, estrogen-blocking supplements were generally considered unnecessary during the cycle, though hormonal rebound after stopping could still occur.
Epistane vs. Other Prohormones
In the now-defunct prohormone market, epistane occupied a specific niche. It was considered milder than compounds like superdrol (methasterone) or dimethazine, which were notorious for extreme liver toxicity and rapid strength gains. Epistane’s appeal was a more moderate trade-off: noticeable muscle hardening and fat loss with side effects that were manageable for most users over short cycles. That said, “milder” is relative. Any 17-alpha methylated oral steroid stresses the liver, and the cholestasis research makes clear that epistane is no exception.
The distinction between “prohormone” and “steroid” that supplement companies relied on was always more of a marketing strategy than a pharmacological reality. Epistane doesn’t need to convert into another compound to become active. It binds directly to androgen receptors at very low concentrations. It is, by every meaningful definition, an anabolic steroid.