What are Steroids? Effects, Harms, and Side Effects of Anabolic Steroids
The word "steroid" is used in different contexts, from muscle growth to asthma medication. This guide explains in simple terms what anabolic steroids are, how they truly work, and why results and risks cannot be separated.
Short answer: in the sports world, "steroid" usually refers to anabolic-androgenic steroids (AAS). These are powerful hormonal drugs that mimic the effects of testosterone and can increase muscle protein synthesis. Yes, they can affect muscle mass and strength; however, the same mechanism can suppress natural hormone production, creating serious risks for cardiovascular, reproductive, liver, and mental health.
This article does not provide instructions for steroid use, "cycles," injections, or PCT. The goal is to educate and reduce harm. If you are using anabolic steroids, especially if you are considering stopping abruptly, consult an endocrinologist or another qualified physician.
What are Steroids?
Steroid is the name of a broad family of compounds with similar chemical structures, not a single substance. The body itself produces steroid hormones like testosterone, estrogen, cortisol, and aldosterone from cholesterol. Therefore, saying "all steroids are the same" is incorrect.
Searches for "what are steroids?", "what is steroid medication?", and "what is a steroid injection?" often confuse two completely different groups:
Anabolic-Androgenic Steroids
These are testosterone and its synthetic derivatives. They can be used in medicine with limited indications; however, their non-medical use for muscle and performance in sports is the main subject of risk.
Corticosteroids
These are anti-inflammatory drugs like prednisolone and cortisone. They can be prescribed by a doctor for asthma, allergies, autoimmune, and joint diseases; they are not used for muscle building.
A steroid injection mentioned in joint or pain treatment is often a corticosteroid injection. A steroid injection mentioned in bodybuilding is usually an injectable anabolic steroid. Although their names are similar, their purposes and risk profiles are not the same.
What are Anabolic Steroids?
Anabolic-androgenic steroids (AAS) are substances designed to enhance or mimic the effects of testosterone in the body. "Anabolic" refers to tissue building, especially muscle; "androgenic" refers to facial hair, voice deepening, and other male-type sexual characteristics.
Testosterone itself is an anabolic-androgenic steroid. Names like nandrolone, stanozolol, oxandrolone, methandrostenolone, and trenbolone are associated with this class. The DEA lists several of these substances among the steroids frequently encountered by U.S. law enforcement. This listing of names is not a recommendation for use; each has different effects, medical status, and risks. [2]
Medical use is not the same as non-medical use
In some cases, doctors may prescribe approved androgen medications for the treatment of diagnoses such as hypogonadism and in specific clinical situations. The goal here is to restore physiological levels based on laboratory analysis, symptoms, and medical history. High-dose, non-medical use for muscle and appearance, however, has a completely different risk-benefit balance.
Testosterone Replacement Therapy (TRT) is a treatment only when conducted under confirmed medical necessity and doctor's supervision. Using it to increase muscle in an individual with normal testosterone levels is not TRT. The presence of the same hormone does not equate the purpose of use and safety.
How do Anabolic Steroids Work in the Body?
AAS can alter gene expression by binding to androgen receptors in cells. In muscle tissue, this can help increase protein synthesis, nitrogen retention, and adaptation to exercise. However, this system does not only work in the biceps and chest: androgen receptors and hormonal signals also affect the reproductive system, brain, skin, cardiovascular system, and other tissues. [6]
Androgen effects in the blood can rise above the body's natural physiological range.
Along with strength training, muscle protein synthesis and lean mass gain can be enhanced.
The brain can reduce LH and FSH signals, which may lead to weakened natural testosterone and sperm production.
This last stage is one of the key points: when the body receives a strong external androgen signal, it tries to reduce its own production. Therefore, even if the androgen effect in the blood is high during use, the internal activity of the testes, sperm production, and post-cessation hormone levels may weaken. [6]
Do Steroids Really Build Muscle?
Yes, anabolic steroids have been scientifically shown to increase muscle mass and strength. In a classic controlled study, healthy men receiving supraphysiological doses of testosterone, especially in conjunction with strength training, showed increases in lean mass, muscle size, and strength. [5]
However, "it works" does not mean "it's safe." The performance effect of the drug and the health risk can stem from the same hormonal system. The selected participants in controlled research, known composition, and short follow-up period do not guarantee safety for products bought online, combinations of several substances, and long-term use.
| Question | Scientific Answer | What to consider? |
|---|---|---|
| Can it build muscle? | Yes AAS can increase lean mass in conjunction with exercise. | The result is not separate from hormonal, cardiovascular, and reproductive risks. |
| Can it increase strength? | Yes Strength increase has been shown under certain conditions. | Tendons, heart, and blood pressure may not adapt at the same rate. |
| Does it directly "melt" fat? | Simplification Body composition can change, but energy balance is still key. | "Fat-burning steroid" marketing can downplay the danger. |
| Are the results permanent? | No guarantee After cessation, water, performance, and a portion of muscle mass may decrease. | Natural hormone suppression can make recovery and training ability difficult. |
The Difference Between Steroids, Cortisone, SARMs, TRT, and Creatine
Although used in the same sentence, these concepts are not synonymous. The following comparison briefly distinguishes the most searched questions: "is creatine a steroid?", "are SARMs steroids?", and "is TRT considered a steroid?".
| Concept | What is it? | Main purpose / effect | Important difference |
|---|---|---|---|
| Anabolic Steroid (AAS) | Testosterone and its synthetic derivatives | Anabolic and androgenic effects via the androgen receptor | It is a hormonal drug; non-medical use carries serious risks. |
| Corticosteroid / Cortisone | A group of drugs mimicking cortisol's effect | Reduction of inflammation and immune response | Not for muscle building; has its own unique side effects. |
| SARMs | Selective Androgen Receptor Modulators | Claimed selective effect on the androgen receptor | Not of steroid structure, but not risk-free; FDA has not approved for bodybuilding. |
| TRT | Testosterone treatment for diagnosed deficiency | Restoring physiological levels under medical supervision | Different from non-medical use aimed at exceeding normal levels. |
| Creatine | A natural nitrogenous compound found in the body and food | Supporting the phosphocreatine/ATP energy system in short, high-intensity work | Not a hormone, does not bind to androgen receptors, and is not a steroid. |
| Protein powder | A convenient form of protein derived from food | Supplementing daily protein needs | Not a steroid or hormone. |
One cannot conclude about SARMs that "it's not a steroid, therefore it's safe." The FDA states that these substances are not approved and are associated with serious risks such as liver damage, heart attack, and stroke; WADA includes them in its list of prohibited anabolic agents. [3][4]
Tablet, Gel, and Steroid Injection: Does the Form Eliminate Risk?
Anabolic steroids can come in forms such as oral tablets, injections, and topical gels. While the form may change absorption and the burden on some organs, no form makes non-medical AAS use risk-free.
Oral/tablet
Some alkylated oral AAS are more strongly associated with liver damage and a significant decrease in HDL cholesterol.
Injection
A lower liver risk does not mean a lower overall body risk; infection and counterfeit product risks are added.
Gel/cream
Can be a medical testosterone preparation. Risks such as transfer to another person through skin contact and hormone suppression require medical supervision.
Non-sterile injections and needle sharing can lead to blood-borne infections such as abscesses, bacterial infections, hepatitis B/C, and HIV. In vials of unknown origin, the composition, concentration, and sterility may differ from what is stated on the label.
Harms and Side Effects of Anabolic Steroids
The risk depends on the individual's age, sex, genetics, existing diseases, duration of use, actual dose, co-administration of several substances, and the true composition of the product. Saying "I have no problem now" does not mean there is no future risk; changes in blood pressure, cholesterol, heart structure, and sperm production can remain asymptomatic for a long time.
1. Cardiovascular system
AAS use has been associated with decreased HDL ("good") cholesterol, increased LDL, high blood pressure, blood thickening, thickening of the heart muscle, arrhythmias, and arterial stiffness. These can contribute to the risk of heart attack, stroke, heart failure, and sudden death. [7]
A long-term cohort study published in 2025 reported that AAS users had a significantly higher risk of cardiovascular diseases. While this observational study alone does not prove cause-and-effect, it aligns with previous cardiac imaging and mechanistic data. [8]
2. Hormones, Sexual Function, and Fertility in Men
Exogenous androgen intake can suppress the hypothalamic-pituitary-testicular axis. As a result, LH and FSH decrease, testicles may shrink, and natural testosterone and sperm production can sharply decline. Erectile and libido problems, gynecomastia, and infertility may occur. Systematic reviews indicate the negative impact of AAS use on sperm count, motility, and male fertility. [6][9]
3. Hormonal and Reproductive Effects in Women
In women, menstrual cycle disturbances or cessation, ovulation suppression, decreased fertility, facial and body hair growth, male-pattern hair loss, acne, clitoral enlargement, reduction of breast tissue, and voice deepening may occur. Voice changes and some virilization signs may not fully reverse after cessation.
4. Liver and Kidneys
Specifically, some oral, alkylated AAS have been associated with cholestasis, altered liver enzymes, peliosis, and rare liver tumors. Kidney damage is also reported; high blood pressure, dehydration, other medications, and contaminants in counterfeit products can increase the risk. The FDA has recorded adverse events, including serious liver damage, in bodybuilding products hidden with steroids and steroid-like substances. [3]
5. Mental Health and Addiction
Irritability, impulsivity, aggression, anxiety, hypomania/mania, and depressive symptoms may occur. Not every user experiences "roid rage," and previous mental state also influences behavior; nevertheless, there is biological and clinical evidence for mood changes at high doses. During cessation, depression, low self-esteem, and a strong desire to reuse may arise. [1][6]
6. Skin, Hair, and Breast Tissue
Oily skin, severe acne, androgenic alopecia in individuals with a genetic predisposition to hair loss, and enlargement of breast glands in men may be observed. These changes are not just cosmetic problems; they can indicate a disruption of hormonal balance.
7. Blood, Tendons, and Musculoskeletal System
Increased erythrocyte and hematocrit levels can elevate blood viscosity. While muscle strength increases rapidly, tendon adaptation may not keep pace; long-term AAS use has been particularly associated with upper extremity tendon ruptures. In adolescents, premature closure of growth plates can halt height development.
Seek emergency medical attention if you experience chest pain, shortness of breath, loss of consciousness, sudden one-sided weakness, speech disturbance, severe headache, jaundice, dark urine, sudden swelling and pain in the leg, severe aggression, psychosis, or thoughts of self-harm.
Are Steroid Side Effects Reversible?
Some changes may improve after cessation of use, some may persist for months or years, and some may be permanent. It is not possible to accurately predict the recovery period in advance. Short-term use also does not provide a full guarantee.
| Change | Possible course | Important note |
|---|---|---|
| Natural testosterone suppression | May recover within months in many individuals; can last for years after prolonged use. | Individual Analysis and medical evaluation are needed. |
| Decreased sperm production | Recovery may be slower than testosterone and there is no guarantee of full recovery. | Months–years If planning children, consult a urologist/endocrinologist without delay. |
| HDL/LDL changes | May improve after cessation. | Complete regression of structural damage in vessels and heart is a separate issue. |
| Voice deepening in women | May not fully reverse. | May be permanent |
| Hair loss | May continue if genetic predisposition has been activated. | May be permanent |
| Mood and cessation symptoms | May last for weeks or months. | Severe depression and suicidal thoughts require emergency assistance. |
A clinical review notes that in many men who used for less than a year, the hormonal axis recovered within months, while with long-term and high-dose use, low testosterone symptoms could persist for years. These figures are not a personal "recovery calendar" and should not be used for self-treatment plans. [6]
Steroid Addiction and Withdrawal Syndrome
Anabolic steroids typically do not produce immediate euphoria like cocaine and opioids. Nevertheless, NIDA states that continued use despite negative consequences can develop into a substance use disorder. Fear of changes in appearance, hormone suppression, low energy, and periods of depression can lead to relapse. [1]
Withdrawal symptoms
Fatigue, sleep disturbances, loss of appetite, decreased libido, anxiety, depression, and a strong craving for reuse may occur.
Why is medical help important?
A doctor can assess hormonal suppression, cardiovascular risk, fertility, and mental health together; internet PCT does not replace this.
Clomiphene, hCG, aromatase inhibitors, and other hormonal drugs have their own risks, contraindications, and problems with misuse. High-quality clinical evidence for the treatment of AAS cessation is limited; therefore, a plan should not be established without analysis and medical evaluation.
"Legal Steroids" and Bodybuilding Products with Hidden Ingredients
Marketing terms such as "natural anabolic," "prohormone," "test booster," "legal steroid," or "steroid alternative" do not automatically indicate that a product is safe or legal. Some products may contain undeclared steroids, steroid-like substances, or unapproved SARMs.
In its 2024 warning, the FDA reported that illegal steroids and steroid-like substances were found in some bodybuilding products sold online and at retail, and that these were linked to adverse reactions including serious liver damage, heart attack, stroke, kidney damage, and blood clots. [3]
Miraculous, very rapid muscle growth; "same results as anabolic steroids"; "requires PCT"; products claiming to alter hormones and estrogen, but not providing full ingredients and independent testing, are particularly suspicious signals.
Doping and Legal Status: What to Know for Azerbaijan and the USA?
In Professional and Tested Sports
In WADA's 2026 Prohibited List, anabolic agents are listed under category S1, and anabolic-androgenic steroids are prohibited both in-competition and out-of-competition. The rules are updated annually. Tested athletes with a medical need must check the relevant Therapeutic Use Exemption (TUE) rule in advance. [4]
In the USA
According to the DEA, anabolic steroids and testosterone are Schedule III controlled substances in the U.S. federal system. Medical use with a valid prescription is possible; obtaining, possessing, importing, and selling without a prescription can lead to legal consequences at both federal and state levels. As state regulations and the status of specific products may vary, verification should be done with official sources and a legal expert. [11]
In Azerbaijan
Medical use, prescription, sale, and customs/import regulations may depend on the specific active substance and product. The phrase "prohibited in doping" is not automatically the same as criminal law. Before purchasing or importing, it is necessary to check the current drug and customs regulations of the Republic of Azerbaijan from official sources. Obtaining hormonal drugs without a doctor's prescription is also dangerous from a health perspective.
Is it Possible to Build Muscle and Strength Without Steroids?
Yes. Natural development may be slower, but the core system that sustains results is training, energy and protein balance, recovery, and consistency. No legal dietary supplement should promise the pharmacological effect of an anabolic steroid; the claim "as powerful as steroids, completely safe" is not a reliable signal.
Progressive strength training
Gradually increase weight, repetitions, or quality work volume over weeks; maintain proper technique and recovery.
Sufficient protein and energy
Meet daily protein needs primarily from food; protein powder is merely a convenient food choice.
Sleep and recovery
Consistent sleep, rest days, and stress management are crucial for both performance and hormonal health.
Scientifically proven choice: creatine
Creatine is not a steroid. It is one of the most researched supplements that supports short and high-intensity performance.
You can read why creatine is completely different from steroids and what the scientific evidence says in our separately prepared comprehensive guide.
Read the Creatine GuideWhat Should I Do If I Am Currently Using Steroids?
The most beneficial step is to seek medical support where you will not be judged, without hiding your use. Tell your doctor the name of the substance, how long you have been using it, any other medications and supplements, the date of your last dose, and all your symptoms. If you have product packaging and laboratory results, take them with you.
An endocrinologist, urologist, cardiologist, and mental health specialist can join the process as needed.
Blood pressure, cardiac symptoms, lipids, blood parameters, liver-kidney, and hormonal/reproductive status can be reviewed.
Internet-sourced PCT, "detox," and additional hormones can mask a diagnosis and create new risks.
If severe depression, self-harm, or suicidal thoughts arise during cessation, do not be alone; immediately contact local emergency services, the nearest emergency medical department, and a trusted person.
Most Frequently Asked Questions About Steroids
What are steroids?
Steroid is a broad class of substances with similar chemical structures. In a sports context, it usually refers to anabolic-androgenic steroids that mimic the effects of testosterone. Corticosteroids, used in medicine for inflammation, are a different group.
What are anabolic steroids?
Anabolic steroid is testosterone or its synthetic derivative. It can increase muscle protein synthesis and androgenic effects, but can create serious systemic risks by suppressing natural hormone production.
Is creatine a steroid?
No. Creatine is not a hormone, does not bind to androgen receptors, and does not belong to the AAS class. It is a natural compound that supports phosphocreatine reserves and rapid ATP regeneration in muscle.
Is protein powder a steroid?
No. Reliable protein powder is protein derived from milk, eggs, soy, peas, or other food sources. However, an unknown "hardcore" bodybuilding product should not be equated with regular protein; the label and manufacturer should be checked.
Is a steroid injection safer than a tablet?
Not necessarily. Some oral AAS can be more toxic to the liver, but injections do not eliminate hormonal, cardiovascular, and reproductive risks. Furthermore, there are risks of sterility, abscesses, counterfeit products, and needle sharing.
Do steroids cause infertility?
They can. AAS can suppress LH and FSH, reducing or stopping sperm production. Recovery can take months or years, and may not be complete in some individuals. Users planning children should seek early urologist/endocrinologist evaluation.
Do steroids harm the heart?
Yes, AAS are associated with unfavorable cholesterol changes, high blood pressure, thickening of the heart muscle, arrhythmias, clotting, and atherosclerosis. The risk can develop in some individuals without symptoms.
Are muscles completely lost when steroids are stopped?
It is not accurate to say that all or none of the results will be lost. Water, glycogen, training performance, and a portion of muscle mass may decrease. How much remains depends on training, nutrition, genetics, and the recovery of natural hormones.
Are SARMs considered steroids?
Chemically, they are not steroids, but they are anabolic substances that affect the androgen receptor. The name "selective" does not make them safe. The FDA has not approved them for bodybuilding; WADA includes them in the list of always prohibited anabolic agents.
Is TRT the same as steroid use?
The substance may be testosterone, but the purpose and level are different. TRT aims to restore physiological levels under medical supervision for diagnosed deficiency. Use to exceed normal levels is not medical TRT.
What is "Metan"?
In gym jargon, "Metan" usually refers to the oral AAS called methandrostenolone/methandienone. It can create serious risks for the liver, cholesterol, blood pressure, and natural hormone system.
Do "natural steroids" or "legal steroids" really exist?
These terms are often marketing jargon. A dietary supplement cannot provide the same pharmacological result as a steroid without risk. Products promising hormonal effects and not disclosing full ingredients carry the risk of hidden or unapproved substances.
Are steroids legal in the USA?
In the USA, anabolic steroids and testosterone are Schedule III controlled substances. Legal medical use requires a valid prescription; unauthorized possession, import, and sale can lead to legal consequences.
Are steroids prohibited in doping tests?
Yes. In WADA's 2026 list, anabolic agents, including AAS, are prohibited during and out-of-competition. Tested athletes must also check their prescription medications according to TUE and anti-doping rules.
Can steroid use be stopped abruptly?
A safe cessation plan cannot be provided without a personal medical history. AAS cessation can cause depression and hormonal symptoms; medical corticosteroids should also not be stopped abruptly in some cases. Talk to your doctor, stating the exact substance you are using.
Conclusion: 7 Most Important Facts About Steroids
- "Steroid" is a broad term; anabolic steroids and corticosteroids are not the same drug.
- Anabolic steroids can increase muscle and strength, but this does not make them safe.
- Cardiovascular, natural hormone, fertility, and mental health risks are real.
- The injectable form does not eliminate hormonal and cardiac risks.
- Creatine and protein are not steroids; SARMs, while not steroids, are not risk-free or doping-compliant.
- Some side effects may be reversible, others may be long-lasting or permanent.
- Individuals using them should seek non-judgmental medical help instead of self-administering PCT.
Key Scientific and Official Sources
- National Institute on Drug Abuse (NIDA). Anabolic Steroids and Other Appearance and Performance Enhancing Drugs.
- U.S. Drug Enforcement Administration (DEA). Steroids — Drug Fact Sheet.
- U.S. Food and Drug Administration (FDA), 2024. Caution: Bodybuilding Products Can Be Risky.
- World Anti-Doping Agency (WADA), 2026. The 2026 Prohibited List.
- Bhasin S, et al. (1996). The Effects of Supraphysiologic Doses of Testosterone on Muscle Size and Strength in Normal Men. New England Journal of Medicine.
- Anawalt BD. (2019). Diagnosis and Management of Anabolic Androgenic Steroid Use. Journal of Clinical Endocrinology & Metabolism.
- Pope HG Jr, Wood RI, Rogol A, et al. (2014). Adverse Health Consequences of Performance-Enhancing Drugs: An Endocrine Society Scientific Statement. Endocrine Reviews.
- Windfeld-Mathiasen J, et al. (2025). Cardiovascular Disease in Anabolic Androgenic Steroid Users.
- Mulawkar PM, et al. (2023). Use of Anabolic-Androgenic Steroids and Male Fertility: A Systematic Review and Meta-analysis.
- Bond P, Smit DL, de Ronde W. (2022). Anabolic–androgenic steroids: How do they work and what are the risks? Frontiers in Endocrinology.
- U.S. Drug Enforcement Administration. Drug Scheduling — Schedule III.
- NHS. Anabolic steroid misuse.
- Endocrine Society, 2021. Steroid abuse by men leads to long-lasting impaired testicular function.
- Antonio J, et al. (2021). Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition.
