Muscle & Brawn 2.0 is live! New Tools, Voice Reader, Compound Index, Features and more on the way. Want to explore what’s new → Click Here
Independent & reader-supported — every article medically reviewed
Anabolics

Steroids vs Prohormones: Are Prohormones Worse Than Steroids?

How prohormones differ from anabolic steroids, which ones are now controlled substances, and why converting in the body does not make them safer.

Updated 17 min read
Muscular man sitting on a gym bench beside a vial, a syringe and a pill bottle, for a comparison of steroids and prohormones
Contents11 sections

Steroids and prohormones are often sold to lifters as two different things: one an illegal, dangerous drug, the other a legal supplement. The chemistry says otherwise. Anabolic steroids are active hormones, meaning testosterone and its synthetic derivatives. Prohormones are precursors that the body converts into an active androgen. Once that conversion happens, the result acts on the same androgen receptor and carries the same kinds of risks.

So are prohormones worse than steroids? Not in every way, but they are not the safer option many buyers assume. Most are oral, many of the best known were 17-alpha-methylated and hard on the liver, they have far less research behind them, and they tend to be used by younger lifters who treat them as supplements rather than drugs. Many of the prohormones once sold in supplement shops are now controlled substances in the United States.

This guide covers how steroids and prohormones differ, how US law has treated prohormones since 2004, what the research shows about their side effects, and where each carries more risk. Nothing here is a recommendation to use either.

Many prohormones are Schedule III controlled substances in the United States, and those still sold as supplements have not been reviewed by the FDA for safety or effectiveness. Anabolic steroids are controlled substances in most jurisdictions. Both carry serious health risks, including liver injury, cardiovascular damage, hormonal suppression and infertility, and both are prohibited by WADA in all competitive sports. This article is for educational and harm-reduction purposes and is not medical or legal advice. Consult a qualified healthcare professional before making any decision about anabolic compounds. Muscle & Brawn does not encourage the use of anabolic steroids or prohormones.

Key Takeaways

  • Steroids are active hormones. Prohormones are precursors that enzymes convert into an active androgen, which then acts on the same receptor and causes the same kinds of side effects.
  • “Legal” is a moving target. US laws in 2004 and 2014 turned androstenedione, 1-AD, Halodrol, Epistane and dozens of other former supplement prohormones into Schedule III controlled substances.
  • Most prohormones are oral, and many of the strongest were 17-alpha-methylated, the same change that makes oral steroids hard on the liver. Superdrol has been linked to published cases of severe cholestatic liver injury.
  • Even short prohormone trials show harm. In a 1999 JAMA trial, androstenedione did not raise testosterone or improve training gains, but it raised estrogen and lowered HDL cholesterol.
  • Any prohormone strong enough to work suppresses natural testosterone, just as steroids do. Blood work before and after use is the only way to know where recovery stands.

Steroids vs Prohormones: What Is the Difference?

Anabolic-androgenic steroids (AAS) are testosterone and synthetic compounds built on its structure, such as nandrolone, trenbolone and oxandrolone. They are already active when they enter the body and bind directly to the androgen receptor, which raises muscle protein synthesis. Testosterone itself is an FDA-approved prescription medicine for men with clinically low testosterone.

Prohormones sit one step back in the chain. They are precursors that enzymes in the body convert into an active androgen. A few examples:

  • Androstenedione (“andro”): converted partly to testosterone and partly to estrogens.
  • 1-androstenediol (1-AD): converted to 1-testosterone, a potent androgen.
  • Halodrol (chlorodehydromethylandrostenediol): converted to chlorodehydromethyltestosterone, the active steroid in Turinabol.
  • 19-nor prohormones (such as 19-norandrostenedione): converted to nandrolone.

Two common beliefs about prohormones are wrong. First, they do not “boost natural production.” They supply extra androgen from outside, and the body responds as it does to steroids: it makes less of its own testosterone. Second, not every product sold as a prohormone was one. Superdrol (methasterone) and M1T (methyl-1-testosterone) were sold as prohormones in the 2000s, but both are active steroids in their own right. In practice, “prohormone” became a marketing and legal label more than a chemical one.

Side-by-Side Comparison

Anabolic SteroidsProhormones
What it isAn active hormone: testosterone or a synthetic derivativeA precursor the body converts into an active androgen
Usual formInjectable or oralAlmost always oral
How it worksBinds the androgen receptor directlyWorks only after enzymes convert it
Research baseDecades of clinical use and controlled trials for testosteroneA handful of small trials; many compounds never tested in humans
US legal statusSchedule III; testosterone available by prescriptionMany now Schedule III; others sold as supplements without FDA review
Liver strainLow for injectables; high for 17-alpha-methylated oralsOften high, because many are methylated orals
Suppresses natural testosteroneYesYes, if strong enough to work
Sport (WADA)Prohibited at all timesProhibited at all times

How US Law Caught Up With Prohormones

The Andro Years

Prohormones became a supplement category in the years after the Dietary Supplement Health and Education Act of 1994, which lets supplements go on sale without FDA approval. DHEA and androstenedione were the first big sellers. Patrick Arnold, the chemist credited with bringing androstenedione and later 1-AD to the supplement market, went on to become known as the chemist behind THG, the designer steroid at the center of the BALCO doping scandal.

Andro became famous in 1998, when baseball player Mark McGwire was reported to be using it during his record-setting home run season. Sales boomed, but the research did not back the hype. In a randomized controlled trial published in JAMA in 1999, young men who took 300mg of androstenedione a day over eight weeks of weight training gained no more strength or muscle than men on placebo. Their testosterone did not rise. Their estrogen levels did, and their HDL (“good”) cholesterol fell.

The Anabolic Steroid Control Act of 2004

In March 2004 the FDA warned companies selling androstenedione to stop. Congress then passed the Anabolic Steroid Control Act of 2004, signed in October 2004 and in force from January 2005. It added androstenedione, 1-AD, 4-androstenediol, the 19-nor precursors of nandrolone, 1-testosterone and M1T to the legal definition of anabolic steroids, making them Schedule III controlled substances alongside testosterone. DHEA was specifically left out, which is why it is still sold as a supplement in the US.

Designer Prohormones and the 2014 Act

The 2004 law named specific compounds, so the industry moved to ones it did not name. The years after 2005 were the era of designer prohormones such as Superdrol, Halodrol, Epistane (sold as Havoc), methylstenbolone and prostanozol. Some came from old pharmaceutical research: Superdrol, for example, was described by researchers in the 1950s but never sold as a medicine, so it had never been through clinical safety trials. Many of these products were 17-alpha-methylated oral compounds, and reports of liver injury followed.

Today Superdrol, Halodrol, Epistane and the other big names of that era are Schedule III controlled substances, through DEA scheduling and the Designer Anabolic Steroid Control Act of 2014. That law, signed in December 2014, added 25 compounds at once, gave the DEA a faster route to schedule new ones, and created penalties for selling products that contain an anabolic steroid without saying so on the label.

This is why older lists of “legal prohormones” are unreliable. Many of the products once sold as legal alternatives to steroids are now controlled substances themselves.


Are Prohormones Worse Than Steroids?

Milligram for milligram, steroids are more potent, and a high-dose steroid cycle can do more damage than a modest prohormone. But the idea that prohormones are the safe, legal version of steroids does not hold up. On several points they carry more risk, not less.

The Liver: Mostly Oral, Often Methylated

Swallowed drugs pass through the liver before they reach the rest of the body, and the liver breaks most androgens down quickly. Adding a methyl group at the 17-alpha position slows that breakdown, which lets the drug survive and work as a pill. It is also what makes 17-alpha-methylated steroids such as Anadrol and Winstrol hard on the liver. The risks include cholestasis (bile backing up in the liver, causing jaundice) and, with long-term use, blood-filled cysts in the liver (peliosis hepatis) and liver tumors.

Many of the strongest prohormones were methylated orals, including Superdrol, Halodrol, Epistane and M1T. Published case reports describe young men with severe cholestatic jaundice after taking Superdrol, some with kidney failure as well (see our Superdrol cycle guide). In a report from the US Drug-Induced Liver Injury Network, 44 young men developed severe and prolonged cholestatic liver injury after taking bodybuilding supplements, many of which contained anabolic steroids. Injected testosterone, by contrast, avoids the first pass through the liver.

Not every oral is methylated, and not every prohormone sold today is. But a non-methylated prohormone still has to be converted by enzymes to do anything, and for most of them no liver data exists at all.

Cholesterol and the Heart

Oral androgens tend to hit cholesterol harder than injected testosterone. In a classic 1989 study published in JAMA, the oral 17-alpha-alkylated steroid stanozolol lowered HDL cholesterol far more than injected testosterone enanthate did.

Prohormone trials show the same pattern. HDL fell with androstenedione in the 1999 JAMA trial. In a small four-week trial of the prohormone 1-Andro, published in the Journal of Applied Physiology in 2014, men who took it while training gained more muscle and strength than men on placebo, but their HDL dropped sharply, their LDL rose and their kidney markers got worse. The study’s title sums it up: the prohormone “enhances resistance training gains but impairs user health.”

Low HDL and high LDL are among the main ways androgen use is thought to raise heart disease risk. Blood pressure can rise too, especially with compounds that cause water retention.

Testosterone Suppression

Any androgen strong enough to build muscle tells the brain to turn down its signal to the testes, through the hypothalamic-pituitary-gonadal (HPG) axis. Natural testosterone and sperm production fall. That happens whether the androgen came from an injection or from a capsule the body converted. Low testosterone after a cycle, known as anabolic steroid-induced hypogonadism, can cause low libido, fatigue and low mood, and recovery can take months.

There is almost no research on recovery after prohormone use specifically. Users borrow post-cycle therapy (PCT) protocols from steroid users, which have weak evidence of their own. Blood work before and after a cycle is the only way to know where recovery stands. Our PCT guide covers recovery in more depth.

Less Research, Less Quality Control

Testosterone has decades of clinical use behind it, and its effects on muscle have been tested in controlled trials at doses as high as 600mg a week. Most prohormones have been tested in a handful of small trials, and many designer compounds never in humans at all. The people taking them are, in effect, the trial.

Quality control is a second gap. In the US, the FDA does not approve supplements or review them for safety before they go on sale. Contamination is documented: in a study published in 2004, an IOC-accredited lab tested 634 non-hormonal supplements from 13 countries and found that 94 of them (14.8%) contained prohormones that were not on the label. Steroids have the opposite problem. A 2022 meta-analysis found that 36% of black-market steroid samples were counterfeit and a further 37% substandard.

Who Uses Them

The last difference is the users. Steroids are hard to get without a black-market source, and most people who take them know they are taking a drug. Prohormones have been sold online and in supplement shops, and are often bought by teenagers and beginners who see them as just another supplement. Starting androgens young, before training and diet are in place and without blood work, makes it more likely that side effects go unnoticed until they are serious.

Where the Risks Differ

RiskAnabolic SteroidsProhormones
PotencyHigher; doses can climb far above medical useLower and less predictable
LiverMainly with methylated oralsCommon, since many are methylated orals
CholesterolWorse with orals and high dosesHDL drops seen even in short trials
Testosterone suppressionStrongPresent with any effective prohormone
Human researchLarge for testosterone; thinner for other steroidsVery little
Product qualityCounterfeit and underdosed black-market productsUnlisted ingredients; no FDA review before sale
Injection risksInfection and abscesses with non-sterile productsNone (oral)
Typical userUsually aware it is a drugOften young and treating it as a supplement

A Doctor’s View on Prohormone Safety

Dr. Khash Farzam wrote about the safety of prohormones for an earlier version of this article. He starts from the definition: a prohormone is a prodrug, an inactive substance the body converts into an active one. Given that, he argues, it is intuitive that prohormones are no safer than the steroids they become. His conclusion:

“In conclusion, it is obvious that prohormones are not any safer than anabolic steroids. They carry the same HPG axis suppressive effects, damage the internal organs and essentially induce the same side effect profile as anabolic steroids.”

Dr. Khash Farzam

His main points:

  • Methylation means liver toxicity: A 17-alpha-methylated prohormone is liver toxic in the same way methylated oral steroids are, a point he says is often forgotten in prohormone discussions. He cites M1T, which he describes as having steroid-level potency and liver toxicity, and Halodrol, the precursor of the active steroid in Turinabol. Taking the precursor of a steroid makes little sense, he notes, when it is potentially more toxic than the steroid itself.
  • Kidneys, heart and blood pressure: Many of these compounds can also harm the kidneys, lower HDL and raise LDL cholesterol, and raise blood pressure, especially when they cause water retention. Some of these effects may pass after stopping, but he warns that kidney damage may be permanent.
  • Hormonal shutdown: Suppression of the HPG axis is a major concern, particularly given how young many prohormone users are. The long-term effects of this kind of hypogonadism have not been adequately studied.
  • Misuse: Because many users see prohormones as supplements rather than potent drugs, and many are younger than typical steroid users, he expects overall outcomes to be worse. Long-term data are thin for steroids and thinner still for prohormones.

What Prohormones Are Sold Today?

After the 2004 and 2014 laws, the prohormones still sold as supplements in the US are a narrower group. Most are DHEA-related compounds, such as epiandrosterone and so-called 1-Andro, or newer branded compounds such as 3-AD. Sellers market them as falling outside the scheduled lists. That is the seller’s legal position, not FDA approval, and the lists have grown before. Many other countries regulate prohormones as medicines or controlled drugs.

DHEA is the clearest case. It was excluded from the 2004 Act and is sold over the counter in the US, but it is a prescription medicine or controlled drug in many other countries, and WADA lists it as a prohibited anabolic agent. In a controlled trial in young men, 150mg of DHEA a day did not raise testosterone or improve the strength and muscle gained from training.

For anyone comparing what is on sale, a few practical points matter more than marketing claims:

  • Buy from the brand directly rather than from third-party resellers. It lowers the risk of counterfeit or relabeled stock.
  • Check the full chemical name on the label, not just the product name. The same compound is often sold under several brand names.
  • Get blood work before and after: total testosterone, LH, estradiol, a lipid panel, liver enzymes and kidney markers. It is the only way to see the effects you cannot feel.
  • Treat it as a drug: if symptoms or blood results change, stop and see a doctor.

Our guide to the best prohormone companies compares the main brands.

Enhanced Labs
Enhanced Labs At Enhanced Labs, we do not cut corners. Every ingredient is chosen with purpose. Every formula is researched, tested, and refined before it ever reaches your hands. If…
9Excellent
Visit Enhanced LabsBRAWN1010% OFF
Pros
  • Catalog is specifically organized around muscle building, fat loss, testosterone support, and workout performance.
  • Range includes creatine, protein, EAAs, beta-alanine, and L-citrulline alongside more specialized formulas.
  • Orders of $99+ qualify for free US shipping.
Cons
  • Features several strong claims around muscle growth, testosterone, fat loss, and metabolic effects that should be distinguished from independently demonstrated clinical outcomes
  • Heavily oriented toward bodybuilding and performance rather than broader nutritional supplementation.

Natural Options With Real Evidence

For lifters looking at prohormones because progress has stalled, the options with strong evidence are less exciting but carry far less risk. Creatine monohydrate is one of the most studied sports supplements, with consistent evidence for gains in strength and lean mass alongside training. Enough protein, progressive training and good sleep do more for most lifters than any herbal “test booster.”

Herbs sold as testosterone boosters, such as tribulus, have mostly failed to raise testosterone in controlled trials in men. Older claims that creatine ethyl ester boosts testosterone are also unsupported. In a controlled comparison, it performed no better than plain creatine monohydrate.

Who Should Not Use Prohormones

  • Teenagers and young adults, whose hormone systems are still developing
  • Beginners who have not yet built a base of consistent training and diet
  • Women, because of the risk of masculinizing effects, some of which can be permanent
  • Athletes in any drug-tested sport
  • People with heart disease, high blood pressure, high cholesterol, or liver or kidney problems
  • Men trying to have children, since androgens suppress sperm production

The Bottom Line

Prohormones are not a safer, legal version of steroids. They become the same kind of hormone in the body, and many carry more liver risk with far less research behind them.

  • Steroids are more potent, but prohormones share their side effects: suppressed testosterone, worse cholesterol and, for the many methylated orals, real liver risk. Short trials of androstenedione and 1-Andro already showed HDL falling.
  • “Legal” keeps changing. The 2004 and 2014 US laws made dozens of former supplement prohormones, including andro, 1-AD, Halodrol and Epistane, Schedule III controlled substances, and every prohormone is banned in tested sport.
  • Anyone who still uses them should treat them as drugs, not supplements: blood work before and after, and no use by teenagers, beginners or tested athletes.

Frequently Asked Questions

Chemically, a true prohormone is a precursor rather than the active hormone, but the body turns it into an anabolic steroid. US law treats many of them as anabolic steroids: since 2005 a long list of prohormones has been in Schedule III, the same category as testosterone. Some products sold as prohormones, such as Superdrol and M1T, were active steroids all along.
It depends on the compound and the country. In the US, androstenedione, 1-AD, Halodrol, Epistane, Superdrol and many others are Schedule III controlled substances. DHEA and some newer DHEA-related compounds are still sold as supplements, which means the FDA has not reviewed them for safety or effectiveness. Many other countries regulate prohormones as medicines or controlled drugs. In sport, WADA prohibits all of them at all times.
Not as a rule. They are less potent, but once converted they cause the same kinds of side effects, and most are oral. Many of the strongest are 17-alpha-methylated, which is hard on the liver, and they have far less research behind them. A modest prohormone cycle may do less harm than a high-dose steroid cycle, but “legal” does not mean safe.
Yes. Anti-doping tests detect prohormones and their metabolites, and WADA lists them as prohibited anabolic agents in and out of competition. The 19-nor prohormones, for example, produce the same urine metabolite as nandrolone. Athletes have also tested positive after taking supplements contaminated with prohormones that were not on the label.
Effective prohormones suppress natural testosterone, so recovery is a real issue. There is almost no research on PCT after prohormones specifically. Users commonly borrow steroid protocols, which have weak evidence too. Blood work for testosterone and LH a few weeks after stopping shows whether recovery is on track, and persistent low libido, fatigue or low mood are reasons to see a doctor.
Yes. DHEA is a natural adrenal hormone that the body can convert into testosterone and estrogens. It was specifically excluded from the 2004 US steroid law and is still sold as a supplement there, but WADA prohibits it. In young men, a controlled trial found that 150mg a day did not raise testosterone or improve training gains.
Prohormones are steroid precursors that the body turns into androgens. SARMs are mostly non-steroidal compounds designed to act on the androgen receptor more selectively, and they are sold as research chemicals that are not approved for human use. Both suppress natural testosterone and both are banned in sport. See our comparison of prohormones vs SARMs.

Disclaimer

Please read carefully

The information on this site is for educational and informational purposes only, and is not medical advice. Always consult a qualified healthcare professional before using any supplement or medication, or making changes to your health, fitness, or nutrition routine.

Not medical advice

Content here is not a substitute for professional medical advice.

Consult your doctor

Talk to your doctor before starting any supplement or new routine.

Use at your own risk

We are not responsible for adverse effects from acting on this.

Do your research

Make informed decisions about your own health.

No guarantees

Individual results vary. No claims about outcomes.

Important — Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call your doctor or your local emergency number right away.

Written & researched by

Muscle and Brawn Team

The Morning Dose · Free weekly

The research that matters, in five minutes a week.

Join 300,000+ monthly readers getting the sharpest peptide, TRT, and SARMs research and news broken down without the hype. One email. No filler.

No spam. Unsubscribe anytime. 5-minute read, every week.
Latest issue #1

The Morning Dose #1: MK-677 vs HGH, Syringe Math Made Easy, and What HCG Really Protects

MK-677 vs HGH: what seven clinical trials show
Peptide Dosage Calculator: your exact syringe mark
HCG for Bodybuilding: fertility, recovery and side effects
Read time · 1 min Read this issue →

Our Trusted Brands

Our growing community of brands that value quality and innovation.