Anabolic steroids in bodybuilding: types, effects and differences

The Hilma Biocare Shop Reference Guide

Anabolic steroids used in bodybuilding are distinguished by their hormonal family, release rate, oral or injectable form, estrogenic activity, water retention, androgenic effects, and hormonal recovery requirements. These differences determine each molecule’s role in muscle development and the cycles focused on bulking, cutting, or strength.

Types and families of moleculesMuscle, strength and recoveryMuscle gain, cutting, and structural aspects of treatment regimensHormonal stimulation and blood testsThe essentials

Testosterone is the primary reference point. DHT derivatives promote less estrogen-related water retention and a harder muscle appearance. Nandrolone and trenbolone provide strong 19-nor activity, with deeper hormonal suppression. Oral steroids act quickly and fit into shorter phases, while injectable esters create a longer, more consistent exposure.

The quality of a treatment depends on the suitability of the molecule to the objective, the limitation of redundant combinations, the monitoring of blood tests and the consideration of the elimination of products before hormonal reactivation (PCT).Definition Functioning Main families Comparison of molecules Bulking or cutting Oral or injectable Structure of a treatment Side effects Blood tests Hormonal stimulation Hilma Products FAQDefinition

What are anabolic steroids?

Anabolic-androgenic steroids, or AAS, include testosterone and related hormones that activate the androgen receptor. Modifications to their structure alter their oral activity, duration of release, metabolism, estrogenic activity, water retention, and the balance between muscle growth and androgenic effects.

Anabolic activity. Muscle protein accumulation, nitrogen retention, recovery and increase in lean mass.

Androgenic activity. Effects on libido, skin, hair, sebaceous glands and androgen-sensitive tissues.

Ester length. Release rate, injection frequency, accumulation and elimination of injectable hormones.

Aromatization. Conversion to estrogens, with effects on water retention, breast tissue, sexual function, and mood.Muscle and performance

How anabolic steroids increase muscle mass and strength

The hormone enters androgen-sensitive cells and binds to the androgen receptor. This signal alters gene transcription, increases muscle protein accumulation, and improves nitrogen retention. Muscle building drives adaptation, while total exposure, diet, sleep, and genetics determine its extent.

Activation of the androgen receptor. The molecule activates androgen receptors in muscles and other sensitive tissues.
Protein accumulation. The balance shifts towards increased synthesis and storage of muscle proteins.
Training capacity. Increased strength and recovery allow for more productive work throughout the week.

Muscle mass. Increased exposure to androgens increases lean mass when caloric and protein intake matches the target.

Strength. Muscle growth, body weight, mechanical levers, and repeated practice with heavier loads all contribute to increased strength.

Recovery. Faster recovery increases training capacity, making programming and fatigue management more important.Molecule families

The main families of anabolic steroids

Testosterone Family

Testosterone and its esters

Enanthate, Cypionate, Propionate, Undecanoate and Testosterone ester mixtures release Testosterone at different rates.

Profile clearly suited for mass gain and strength
Conversion to estradiol and DHT
A common basis for long-term treatments
Hematocrit and blood pressure to monitor

DHT derivatives

Oxandrolone, Stanozolol, Metenolone and Drostanolone

These molecules promote less water retention related to estrogen, maintenance of lean mass, strength and a harder muscular appearance.

Important role in cutting and body recomposition
Direct androgenic effects on the skin and hair
Marked effects on blood lipids for oral molecules
Oxymetholone leads to rapid muscle and water gain despite its DHT-derived structure.

Family of the 19-nor

Nandrolone and Trenbolone

The 19-nor family combines strong anabolic activity with profound hormonal suppression, a progestational component, and demanding hormonal recovery.

Nandrolone promotes muscle mass gain over a prolonged period
Trenbolone has more pronounced effects on strength and body recomposition
Sexual function and prolactin require special attention.
Long esters prolong elimination after the last injection

Modified derivatives

Methandienone, Turinabol and Boldenone

Chemical modifications create distinct profiles in terms of mass, water retention, strength, appetite, and endurance, while maintaining activity on the androgen receptor.

Methandienone leads to rapid muscle mass and volume gain
Turinabol promotes strength and muscle gains with minimal water retention.
Boldenone acts gradually thanks to a long ester
Each molecule requires different targeted monitoring

Practical comparison

What are the differences between common steroids used in bodybuilding?

Molecule	Current objectives	Estrogenic activity	Water retention	Key points to watch out for
Testosterone	Mass, strength, recovery and foundation of treatment	Flavoring	Moderate to high	Estradiol, hematocrit, blood pressure and lipids
Metenolone	Lean mass and body recomposition	None	Weak	Lipids, androgenic effects and hormonal suppression
Oxandrolone	Leanness, muscle maintenance and steady strength progression	None	Weak	HDL, LDL, liver markers and hormonal suppression
Stanozolol	Muscle hardness, lean appearance and expression of strength	None	Weak	Lipids, liver markers, joints and androgenic effects
Methandienone	Rapid mass gain, muscle volume and strength	Flavoring	High	Liver, lipids, blood pressure and estradiol
Oxymetholone	Rapid weight gain and a sharp increase in strength	Estrogen-like effects	High	Liver, lipids, blood pressure and water retention
Nandrolone	Mass, recovery and extended treatments	Low aromatization with progestational activity	Moderate	Hormone suppression, sexual function and prolactin
Trenbolone	Mass, strength, and body recomposition in advanced practitioners	Progestational activity	Low estrogen-related retention	Blood pressure, lipids, sleep, mood, and hormonal suppression
Boldenone	Gradual gain of lean mass, appetite and endurance	Lightly flavored	Low to moderate	Hematocrit, blood pressure, lipids and prolonged elimination
Drostanolone	Muscle hardness and definition with low body fat percentage	None	Weak	Androgenic effects, lipids, and hormonal suppression

Choice based on objective

Steroids for bulking or cutting

Nutrition defines the growth phase. A calorie surplus creates the conditions for growth, while a calorie deficit reduces fat mass. The choice of nutrients influences muscle maintenance, strength, recovery, water retention, and visual hardness during this phase.Steroids for muscle gain

Muscle mass, strength and volume

Testosterone for a complete androgenic base
Methandienone for rapid gains in size and strength
Oxymetholone for rapid weight gain and high performance under heavy loads
Nandrolone for muscle gain and long-term recovery
Boldenone for more gradual lean muscle mass gain and appetite

Steroids for cutting

Muscle maintenance, strength and visual hardness

Oxandrolone for maintaining lean mass and steady strength progression
Stanozolol for muscle hardness and strength expression
Metenolone for controlled lean muscle mass gain
Drostanolone for muscle definition at low body fat percentage
Short testosterone esters for faster adjustments as a deadline approaches

Water, glycogen, and estrogenic activity account for much of the visual difference between gains with water retention and lean gains. Less water retention accentuates definition, while more water and glycogen increase muscle volume, mechanical leverage, and weight on the scale.Route of administration and duration

Oral or injectable steroids

Criteria	Injectable steroids	Oral steroids
Release	Oily deposits and esters create an exposure lasting several days or weeks.	The tablets produce faster peaks and a shorter exposure time.
Role in the treatment	Main molecule or long-lasting base	Brief addition, targeted phase or exclusively oral treatment
Liver load	Lower direct liver burden for common oily injectables	Higher liver load for common 17-alpha-alkylated molecules
Effect on lipids	Depends on the molecule and the exposure	Marked changes in HDL and LDL levels with many oral medications
Administration	Injection hygiene, site rotation, and storage	Simple tablet intake at more frequent intervals

Testosterone as a basis

Why Testosterone is the basis of a treatment

Anabolic steroids inhibit LH and FSH, reducing the body’s natural production of testosterone and sperm. Exogenous testosterone provides the primary androgen as long as endogenous production remains inhibited, and also supplies estradiol and DHT via the usual conversion pathways.

Primary androgen. Testosterone maintains the central androgenic environment for libido, mood, energy, muscle, and recovery.

Estradiol pathway. Aromatization provides the estradiol necessary for sexual function, mood, joints, bones, and fluid balance.

DHT pathway. 5-alpha-reductase converts Testosterone to DHT in the skin, hair follicles, prostate and sexual tissues.Organizing a treatment

How is a steroid cycle structured in bodybuilding?

A steroid cycle in bodybuilding combines a specific objective, a primary androgen, selected complementary molecules, a limited duration, monitoring, and a phase-out strategy. Each added molecule must have a precise role, identifiable through results and blood tests.

Objective. Mass gain, cutting, strength or body recomposition: the objective defines the desired profile.
Main androgen. The baseline represents the bulk of the exposure and determines the main response.
Complementary molecules. Each additional molecule targets a specific result, such as muscle mass, strength, or hardness.
Duration. Exposure to oral products, ester length, and the slowest molecule determine the practical schedule.
Follow-up. Initial values, blood pressure and repeated blood tests show the direction of the evolution.
Exit strategy. Product elimination, PCT, fertility goals, or continued hormonal suppression define the final phase.

A simpler treatment provides clearer information. Fewer variables make it easier to identify side effects, changes in blood test results, and the contribution of each molecule.Comparison according to objective

The best steroids for bodybuilding according to the goal

Objective	Molecules involved	Determining criteria
Muscle mass	Testosterone, Methandienone, Oxymetholone, Nandrolone	Actual muscle tissue gain, water retention, appetite and blood pressure
Dried	Oxandrolone, Stanozolol, Metenolone, Drostanolone	Muscle maintenance, strength, lipids and visual hardness
Strength	Testosterone, Oxymetholone, Methandienone, Stanozolol	Training performance, body weight, and stress on connective tissues
Body recomposition	Testosterone, Metenolone, Drostanolone, Trenbolone	Nutritional control, training quality, water retention and recovery
Simple structure	A primary injectable with few additives	Predictability, readability of blood test results, and controllable elimination

Risk reduction priorities

The side effects of anabolic steroids that influence cycle choices

Hormonal suppression (LH · FSH). The natural production of testosterone and sperm decreases during suppressive exposure.

Estrogenic activity (E2). Aromatisable molecules influence water retention, breast tissue, libido, mood, and blood pressure.

Lipids and blood pressure (HDL · LDL). Oral and highly androgenic molecules have the most pronounced effects on blood lipids.

Red blood cells (HCT · Hb). Testosterone, Boldenone, and other injectables increase hematocrit and blood viscosity.

Liver markers (ALT · GGT). 17-alpha-alkylated oral steroids impose the greatest direct burden on the liver.

Androgenic effects (Skin · Hair). Acne, hair loss, increased body hair and virilization depend on individual sensitivity to androgens.Use in women

Anabolic steroids in women

Women gain muscle and strength with lower absolute androgen exposure, with virilization being the main limitation. A deeper voice, increased facial or body hair, acne, hair changes, menstrual irregularities, and increased clitoral volume indicate increasing androgen exposure. Oxandrolone is the most common steroid used by female bodybuilders because its androgenic profile is less pronounced than that of stanozolol, methandienone, testosterone, and trenbolone.Biological monitoring

Blood tests before, during and after a steroid cycle

Before

Total and free testosterone
LH, FSH, estradiol and SHBG
Complete blood count, hematocrit and hemoglobin
Lipids, liver and kidney function tests, blood glucose and blood pressure

During

Changes in blood pressure
Hematocrit and hemoglobin
HDL, LDL and triglycerides
Estradiol, liver and kidney markers

After

Total and free testosterone
Recovery of LH and FSH
Lipid and blood cell counts return to initial values
New assessment after elimination of PCT medications

Preparing for hormonal recovery

Hormonal reactivation after a course of anabolic steroids

PCT is used after stopping suppressive hormones when the goal is to restore endogenous testosterone production. The process begins with ester removal, continues with testicular and pituitary recovery, and concludes with blood tests after the recovery medications have been eliminated.

Elimination of molecules. Propionate is eliminated more rapidly than Enanthate, while Undecanoate and Nandrolone Decanoate prolong the withdrawal period.

Resumption of hormonal signaling. Clomifene and Tamoxifen increase pituitary signaling by LH and FSH after the decrease in suppressive exposure.

Confirmation of the result. New measurements of Testosterone, LH and FSH show whether endogenous production is maintained after stopping PCT drugs.

During a steroid cycle, hCG stimulates LH receptors to maintain intratesticular testosterone and limit testicular atrophy, while LH and FSH remain inhibited. After the cycle, hCG plays a role during the elimination phase of the drugs, before the SERM-based post-cycle therapy.Product categories

Discover Hilma Biocare steroids

Hilma Biocare Shop classifies anabolic steroids by form and purpose, to move from searching for information on a molecule to the corresponding category.

Oily solutions

Injectable steroids

Find the esters of Testosterone, Nandrolone, Metenolone, Boldenone, Drostanolone and Trenbolone.

See injectables

Products in tablet form

Oral steroids

Compare Oxandrolone, Stanozolol, Turinabol, Oxymetholone, Methandienone and Metenolone Acetate.

View oral products

Testosterone EnanthateLong-acting testosterone for sustained exposure and less frequent injections.OxandroloneOral molecule derived from DHT for cutting, muscle maintenance and strength with little water retention.Metenolone EnanthateInjectable metenolone for controlled lean mass gain and low estrogen-related water retention.MethandienoneOral mass gain molecule for rapid muscle volume and strength gains.Nandrolone DecanoateInjectable 19-nor long-acting for mass and recovery.Boldenone UndecylenateExtended-action injectable for more gradual lean mass gain, appetite and endurance.Frequently Asked Questions

FAQ about anabolic steroids in bodybuilding

Are blood tests necessary before starting a steroid treatment?

Yes. The results before, during and after the treatment allow for comparison of hormonal exposure, estradiol, hematocrit, lipids, liver markers and recovery to the same personal reference point.What determines the duration of a steroid cycle?

The molecule that imposes the main limitation, exposure to oral products, the length of the esters, blood tests, and the target determine the duration. Long esters also prolong the elimination period after the last injection.Do all steroid cycles require PCT?

PCT involves methods that discontinue suppressive hormones and aim to restore endogenous testosterone production. TRT, or cruising, maintains suppression through exogenous administration and follows a different approach.When to start PCT after a steroid cycle?

PCT begins when suppressive exposure has decreased sufficiently to allow the resumption of LH and FSH signaling. This stage is reached more rapidly with short esters than with long esters.Scientific references

Studies used for this guide

Bhasin S, Storer TW, Berman N, et al. The Effects of Supraphysiologic Doses of Testosterone on Muscle Size and Strength in Normal Men.

Bhasin S, Woodhouse L, Casaburi R, et al. Testosterone Dose Response Relationships in Healthy Young Men.

Rahnema CD, Lipshultz LI, Crosnoe LE, Kovac JR, Kim ED. Anabolic Steroid Induced Hypogonadism: Diagnosis and Treatment.

Solanki P, Eu B, Smith J, Allan C, Lee K. Physical, Psychological and Biochemical Recovery from Anabolic Steroid Induced Hypogonadism: A Scoping Review.

Pope HG Jr, Wood RI, Rogol A, Nyberg F, Bowers L, Bhasin S. Adverse Health Consequences of Performance Enhancing Drugs: An Endocrine Society Scientific Statement.

Coviello AD, Matsumoto AM, Bremner WJ, et al. Low Dose Human Chorionic Gonadotropin Maintains Intratesticular Testosterone in Normal Men with Testosterone Induced Gonadotropin Suppression.

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