Anyone looking for the strongest steroids for bulking usually wants to know how significantly they can promote muscle growth and what risks they entail. The internet sometimes lists them as exercises in a training plan, but when it comes to hormonally active substances, ‘stronger’ does not automatically mean safer or more suitable. Let’s take a look at what steroids are, how they relate to muscle growth, and what research shows about their effects and risks – without any rankings, dosages or instructions for use.
When bulking up, it’s easy to mistake a higher number on the scales for pure muscle gain. A mirror helps you check your form, but you can’t read your blood pressure or cholesterol levels from it. As for lab results, it’s not much use yet.
What are steroids, and what does the term ‘anabolic steroids’ mean?
The word ‘steroids’ refers to a broad group of substances, not a single specific preparation. Corticosteroids, for example, are used in medicine to treat inflammatory conditions. Anabolic steroids are synthetic substances related to testosterone, an androgenic hormone. Their use in the context of a specific medical diagnosis under the supervision of a healthcare professional and their non-medical use to alter one’s physique are two distinct situations.
The term ‘anabolic-androgenic steroids’ captures two aspects of their action: ‘anabolic’ refers to tissue formation, particularly muscle proteins, and ‘androgenic’ to effects associated with male sexual characteristics. Individual substances differ in their chemical structure, mode of action and risk profile. This shared label does not make them interchangeable products – just as the word ‘sport’ on the packaging does not necessarily mean the product belongs in every sports bag.
When someone is looking for steroids to build muscle, they usually mean the use of anabolic substances outside of medical indications. A medical prescription has a specific reason and is administered under professional supervision. Using them for bulking has a different aim and may also involve products with uncertain composition, quality or long-term effects.
How do steroids affect muscle growth?
Testosterone and similar substances bind to receptors in cells and can influence muscle protein synthesis. A controlled clinical study by Bhasin et al. on the effects of supraphysiological doses of testosterone in healthy men reported an increase in lean body mass and strength, with the combination of steroids and training yielding a greater increase than training alone. These findings are also summarised in a review of research on the effects of anabolic steroids on skeletal muscle.
This explains why people are interested in steroids for bulking. However, the study’s results are no guarantee of the same outcome for everyone, and a higher figure on the scales does not necessarily mean just more muscle. Lean body mass also includes water and other body components.
In short:
→ The hormonal effect can support anabolic processes, but it is no substitute for training.
→ Weight gain is not automatically pure muscle gain.
→ Effects on muscles and health risks may occur simultaneously.
Research is carried out under specific, controlled conditions. Online products or non-medical use may not have the same composition or course of action. And whilst the substance may influence the speed or extent of the response, it will not do your training for you, plan your diet or sleep for you. It’s a shame – that would be a supplement with a truly wide range of uses.
Which steroids are associated with bulking?
In bodybuilding, testosterone and several of its synthetic derivatives – such as nandrolone, methandienone, oxandrolone, stanozolol and trenbolone – are often mentioned in the context of bulking. These are examples of anabolic steroids associated with the aim of promoting muscle mass and strength. However, their effects and risks are not identical.
Substance or group | What you need to know |
Testosterone | In a study of healthy men , high doses increased both lean body mass and strength. The increase was greater in men who also undertook strength training. |
Nandrolone and trenbolone | In bodybuilding, these are mentioned in connection with efforts to gain muscle and strength. Their effects and risks differ. |
Methandienone, oxandrolone and stanozolol | These are associated with muscle mass gain. Some steroids taken in tablet form can damage the liver. NIH LiverTox describes such damage in connection with certain anabolic steroids. |
We therefore do not rank them from ‘weakest’ to ‘strongest’. Such a ranking would oversimplify the different mechanisms, individual responses and health risks by reducing them to a single figure. NIH’s LiverTox describes cholestatic liver damage associated with certain androgenic steroids; the risk varies depending on the specific compound.
The World Anti-Doping Agency’s Prohibited List for 2026 lists anabolic-androgenic steroids as a prohibited class and names several of them. Athletes subject to anti-doping rules must check both the current list and the rules of their respective federation.
Side effects of steroids: which aspects of health can they affect?
The side effects of steroids depend on the specific substance, the duration of exposure, the individual’s state of health and any combination with other substances. Some changes are noticeable, whilst others may not manifest as obvious symptoms. In the prospective HAARLEM study on blood pressure, lipids and other indicators involving 100 men, several blood pressure and lipid parameters deteriorated during use. In the study group, these parameters later returned to baseline levels; however, a one-year follow-up is insufficient to confirm long-term safety.
A Danish cohort study on cardiovascular disease in users of anabolic steroids compared 1,189 men identified through an anti-doping programme with 59,450 men of the same age and sex from the general population. During an average follow-up period of eleven years, several cardiovascular events, including heart attacks, arrhythmias, cardiomyopathies and heart failure, occurred more frequently in the group of users. This was an observational study, which demonstrates an association rather than providing independent proof of causation. However, its longer follow-up period complements the short-term findings from smaller studies.
Areas that may be affected include:
Heart and blood vessels: changes in blood pressure and blood lipids; with longer-term exposure, more serious cardiovascular events are also being investigated.
Hormones and fertility: suppression of natural testosterone and sperm production, changes in libido, reduced testicular volume or fertility problems. Some men may develop gynaecomastia, i.e. enlargement of breast tissue; this is also described in the the HAARLEM study on the recovery of testicular function following androgen use.
Liver: NIH LiverTox describes cholestatic liver damage associated with certain androgenic steroids; the risk varies depending on the compound and the duration of exposure.
Skin and fluid retention: acne, oilier skin or swelling. The one-year HAARLEM study on the positive and negative effects of androgen use also reported fluid retention and gynaecomastia.
Mental health: reactions vary. A meta-analysis of experimental studies on anabolic steroids and aggression found a slight increase in aggression reported by the participants themselves, which was not confirmed by observers’ assessments.
Changes in women: menstrual irregularities, increased body hair or deepening of the voice may occur; some changes may persist even after discontinuation. Women’s experiences are also documented in a study on the use of anabolic steroids.
The psychological effects are often discussed in terms of the stereotype of ‘steroid rage’. However, the notion that every user reacts aggressively does not hold true universally. Research describes a variety of reactions, and the results of a single study cannot be used to create a psychological profile for every individual. The risks should not be downplayed, but it is equally important not to present them through the lens of stereotypes.
The HAARLEM study on the recovery of testicular function during and after androgen use monitored hormonal and reproductive indicators in amateur athletes. In most men, testosterone levels returned to normal more quickly than sperm production after discontinuation; the recovery of spermatogenesis took longer, and some participants had not seen all the monitored indicators return to normal even at the end of the one-year observation period. The results from a single cohort do not predict the course of events for an individual. However, they do show that discontinuing use does not automatically mean an immediate return to the original state.
Short-term and long-term health risks
Changes may occur whilst taking the medication, but their progression after discontinuation is not the same for everyone. It is helpful to distinguish between three situations:
→ Whilst using the substance: changes may occur in the skin, mood, libido, blood pressure or fluid retention. Some changes may not be apparent without medical examination.
→ After stopping: some changes may resolve gradually, and individual bodily functions may not return to normal at the same rate.
→ With prolonged or repeated use: the potential cumulative effects on the heart and blood vessels, the liver and hormonal regulation warrant greater attention.
Studies vary in terms of the type of substances, the participants and the duration of follow-up; therefore, it is not possible to determine a universal threshold below which non-medical use is risk-free. The outcome is influenced by the specific substance, the method of use, the user’s state of health and any other substances being taken at the same time.
In women, certain androgenic effects can be particularly severe: deepening of the voice or changes to external sexual characteristics may not fully reverse after cessation of use. Research on women is more limited and fragmented than that on men; an example is a study on women’s experiences of AAS use.
With products from unverified sources, the composition may not match the label, which complicates the assessment of both effects and interactions with medicines. In a warning issued in 2025 , the US FDA states that laboratory testing of one bodybuilding product revealed an unlisted anabolic steroid. Whilst this case does not apply to every product on the market, it serves as a reminder that the label is not a laboratory analysis.
When searching for ‘steroid side effects’, people often want to know, above all, which changes should not be underestimated. If you experience severe chest pain, shortness of breath, jaundice, a marked change in mood or any other sudden health problem, you should contact a healthcare professional. When speaking to a doctor, it is important not to withhold information about the substances you are taking; accurate information helps with the examination and the next steps.
Is there a safer alternative to steroids?
Training, diet and recovery do not offer the same mechanism or potential as anabolic steroids, but they provide a safer and more controllable way to support natural progress. The basics are:
→ Strength training with a gradual increase in intensity.
→ Sufficient energy and protein to support training and recovery.
→ Recovery, including sleep and rest days.
→ Proven supplements when they address a specific need – not as a substitute for the basics.
Protein helps meet the body’s needs for muscle protein synthesis and recovery. Common sources include meat, fish, eggs, dairy products, pulses and tofu. Protein powder can help when it is difficult to get enough protein from food alone, but it is a convenience food, not a personal trainer in a sachet. NIH information on supplements for exercise and sporting performance states that sufficient protein supports training adaptation and recovery; supplements can be used to top up your diet as needed.
Creatine monohydrate is one of the better-researched sports supplements. In its review of supplements for exercise and sports performance, the NIH states that it may support performance during repeated short, intense activities, such as strength training, although the response varies between individuals. Some of the initial weight gain may be due to increased water content in the muscles. Creatine is neither a testosterone replacement nor an anabolic steroid; it works through a different mechanism.
Supplements make the most sense when they address a specific need. If your diet provides sufficient protein and you train regularly, an extra sachet of powder will not automatically add another layer of muscle. If you’re not getting enough sleep or your overall energy intake is insufficient, addressing these fundamentals may be more beneficial than looking for yet another ingredient. Labels and promises may seem convincing; however, physiology doesn’t read advertising leaflets.
If you are taking medication, have health issues or suspect a hormonal problem, you should consult a specialist about how to proceed. A dietary supplement is neither a diagnosis nor a treatment. If you’d like to browse our range, you’ll find it in the category Steroid Alternatives. The products in this category have different compositions and intended uses, so it is worth reading the description and warnings for each specific product.
Are the ‘strongest’ steroids also the best?
The strength of the effect alone does not answer the question of whether a substance is a sensible choice. ‘Stronger’ may mean greater muscle mass gain, faster weight gain, greater strength – or even a higher risk of complications. Without precise measurements, it is therefore impossible to make a fair comparison, and the term ‘strongest steroids for bulking’ is not an indication of quality.
A study always relates to a specific substance, a group of people and specific conditions. If fatigue, a decrease in libido or a significant change in mood occurs after use, it is better to discuss the cause with a healthcare professional rather than relying on internet forums.
Conclusion
Anabolic steroids can promote gains in muscle mass and strength, but their effects must be considered alongside the health risks, which may affect the heart, liver, endocrine system, fertility, skin and mental health. The strongest bulking steroids are therefore not automatically the best choice, and a responsible article should neither rank them nor offer instructions on how to use them.
Supplements can help, but progress is best supported by regular training, sufficient energy and protein, and good-quality sleep.
Sources
Bhasin S et al. The Effects of Supraphysiologic Doses of Testosterone on Muscle Size and Strength in Normal Men. New England Journal of Medicine, 1996. https://pubmed.ncbi.nlm.nih.gov/8637535/
McCullough D et al. Impact of anabolic androgenic steroids on skeletal muscle. 2021. https://pubmed.ncbi.nlm.nih.gov/33269425/
Smit DL et al. Prospective study on blood pressure, lipid metabolism and erythrocytosis during and after androgen abuse. Andrologia, 2022. https://pubmed.ncbi.nlm.nih.gov/35014715/
Windfeld-Mathiasen J et al. Cardiovascular Disease in Anabolic Androgenic Steroid Users. Circulation, 2025. https://pubmed.ncbi.nlm.nih.gov/39945117/
Smit DL et al. Positive and negative side effects of androgen abuse. The HAARLEM study: A one-year prospective cohort study in 100 men. 2021. https://pubmed.ncbi.nlm.nih.gov/33038020/
Smit DL et al. Disruption and recovery of testicular function during and after androgen abuse: the HAARLEM study. Human Reproduction, 2021. https://pubmed.ncbi.nlm.nih.gov/33550376/
NIH LiverTox. Androgenic Steroids, 2020. https://www.ncbi.nlm.nih.gov/books/NBK548931/
Chegeni R et al. Anabolic-androgenic steroid administration increases self-reported aggression in healthy males: a systematic review and meta-analysis of experimental studies. 2021. https://pubmed.ncbi.nlm.nih.gov/33745011/
NIH Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance: Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/
World Anti-Doping Agency. 2026 Prohibited List. https://www.wada-ama.org/sites/default/files/2025-09/2026list_en_final_clean_september_2025.pdf
Börjesson A et al. Women’s Experiences of Using Anabolic Androgenic Steroids. Frontiers in Sports and Active Living, 2021. https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2021.656413/full
U.S. Food and Drug Administration. Certain bodybuilding products put consumers at risk of heart attack, stroke, serious liver damage and more, 2025. https://www.fda.gov/drugs/fraudulent-products/certain-bodybuilding-products-put-consumers-risk-heart-attack-stroke-serious-liver-damage-and-more
