Anabolic androgenic steroids work because they raise testosterone far above physiological levels. The price is the shutdown of your own hypothalamic-pituitary-gonadal axis. The body does not distinguish its own testosterone from an injected one, it only sees the concentration: once an excess arrives from outside, the upper floors of the axis withdraw the order to produce, the testicles are left without a signal and shrink. The condition is called steroid-induced hypogonadism. Recovery after a cycle takes months, it is extremely variable, and in some people a full return never happens: in the systematic review by Vilar Neto and colleagues (Andrologia, 2021), out of 38 cases with a fully known outcome, the condition proved reversible in only four. Side effects are not limited to the reproductive axis — the heart, the blood, the liver, the skin and mental health are all affected. A coach's work on this topic ends at explaining the mechanism and referring the client to a physician: selecting drugs, discontinuing them and supervising a "post-cycle exit" is medical practice, and a coach who takes it on is acting outside their qualification and outside the law.
How the axis is built and why injected testosterone switches it off
Testosterone production is governed by a three-storey chain. The hypothalamus releases gonadotropin-releasing hormone, and it does so in pulses rather than as a steady flow. The pituitary responds by releasing luteinising and follicle-stimulating hormone. In the testicles, LH drives the Leydig cells to produce testosterone, while FSH together with intratesticular testosterone sustains sperm production.
Feedback runs upward: high testosterone in the blood inhibits the two upper floors. The system holds itself in balance. It is exactly this loop that breaks when the hormone arrives from outside. The body does not ask where the concentration came from. It sees the number, judges it excessive and withdraws the order to produce. The testicles are left without an LH signal and shrink in volume — this is a visible sign, not a scare story.
The drug clears the system. The order to switch back on does not arrive automatically. The axis has to restart on its own, floor by floor, and that takes months. Sometimes it never restarts fully.
You are not renting someone else's testosterone for the length of a cycle. You are switching off your own, and it does not come back on your schedule.
Steroid side effects: what is affected besides muscle
Gym conversation about side effects usually stops at acne and hair loss. That is the most harmless part of the list.
| System | What happens |
|---|---|
| Reproductive axis | LH and FSH fall. Without LH the Leydig cells stop working; without FSH and intratesticular testosterone, spermatogenesis suffers. The testicles shrink in volume |
| Fertility | Suppression of spermatogenesis, up to the complete absence of sperm. This is the main reason men with a history of cycles turn up at infertility clinics |
| Estrogen trail | Some compounds aromatise into estradiol. Hence gynecomastia and fluid retention |
| Heart and vessels | Left ventricular hypertrophy, a drop in "good" HDL cholesterol, rising blood pressure. Risk accumulates with years of use |
| Blood | Rising hematocrit, thickening of the blood |
| Liver | Above all the oral forms modified at the seventeenth position |
| Skin and hair | Acne, accelerated hair loss in those predisposed |
| Mental health | Mood swings, irritability, and after withdrawal, depressive states |
Dependence stands apart. It is not chemical in the classic sense but behavioural: the fear of losing shape keeps a person on drugs for years. Every attempt to stop brings back the drop in strength and mood, which the person writes off as "just tired", and that pushes them back.
Recovery after a cycle: how long it actually takes
The honest answer is uncomfortable: the spread is enormous and it cannot be predicted in advance.
A 2023 scoping review of recovery from steroid-induced hypogonadism shows that the return of gonadotropins usually takes three to six months, while testosterone approaches its former values over the course of months. At the same time, good prospective data on the natural course of recovery are scarce — the science here rests mainly on case descriptions, and that has to be said out loud.
The systematic review by Vilar Neto and colleagues (Andrologia, 2021) gathered 179 cases, 168 of them with hypogonadism clearly linked to steroid abuse. The outcome was fully known in only 38 cases, and the condition proved fully reversible in four. The authors conclude that the problem is seriously underestimated and that in most cases full recovery is very hard to achieve.
For comparison: even after ordinary replacement therapy or male hormonal contraception, spontaneous recovery of the axis can take up to twenty-four months.
The European Association of Urology guideline on sexual and reproductive health, 2026 edition, requires anabolic steroids to be discontinued 6–12 months before starting testosterone therapy, and states that meta-analyses show no effect of such therapy when baseline total testosterone is above 12 nmol/L. Both figures strike at the central argument heard in gyms — "I will fix it later".
Why "low doses" and "a supervised cycle" do not cancel the mechanism
First. The axis shuts down from small amounts too. The difference lies in how fast it shuts down, not in whether it does: feedback responds to concentration, not to intention.
Second. Hypogonadism is not diagnosed from how someone feels, nor from a single lab slip. The Endocrine Society clinical practice guideline on testosterone therapy (2018) requires symptoms and a persistently low testosterone level confirmed by a repeat fasting morning measurement. The EAU 2026 guideline confirms this: fasting total testosterone remains the standard, and at borderline values free testosterone and SHBG are considered. The reason is simple: secretion is pulsatile and follows a daily rhythm, so a single sample taken at an arbitrary hour does not characterise a person.
Third, and the most uncomfortable point for an honest conversation. There is no contradiction between "hormones decide little" and "hormones decide a great deal" — these are different orders of magnitude. Natural hormone fluctuations after a hard set do not affect muscle growth; this was tested in the controlled work of West and Phillips. Pharmacological doses affect it strongly: in the classic experiment by Bhasin and colleagues (New England Journal of Medicine, 1996), the group given testosterone that did not train at all gained more muscle mass than the group that trained honestly on placebo. Denying this in front of a client is pointless. The conversation is built not on denying the effect but on its price.
What Arnold did and what science says today
| The golden era and its explanations | What is known today |
|---|---|
| Drugs were used in years when this was legal, and under a doctor's supervision | Arnold Schwarzenegger has said so publicly and does not recommend it to young athletes. The legal framework has changed everywhere since |
| Stage results come only from work in the gym, nutrition and character | The results of the golden era were achieved partly through pharmacology. Pretending otherwise forces the reader to chase an unreachable natural target |
| The price of use was not discussed, because it was not known | Data on irreversible hypogonadism, on infertility, on the heart simply did not exist then. Today they do, and repeating half-century-old decisions is not courage but ignorance |
| Heavy compound lifts "raise hormones" and therefore grow the whole body | The short-term spike decides nothing. Compound lifts grow what they load, and that is not little |
Where a coach's work ends
In the 720-hour state retraining programme for coaches written by the Bodybuilding and Fitness Federation of Uzbekistan, this topic has its own 24-hour module in which practical hours outnumber lectures. What is tested there is behaviour, not knowledge: the practical "Refusal" assessment is taken with a standardised client who applies pressure three times, and it is passed only when all five mandatory elements of the script are present at once.
What a coach must do
- Know the mechanism and be able to explain it calmly, without scare tactics and without romance.
- Notice observable signs and describe them factually, without naming a presumed cause: a sudden jump in results, acne on the back and shoulders, facial puffiness, mood swings, talk about "protocols".
- Speak about the price directly and by its proper names: possible infertility, possible lifelong dependence on replacement therapy, the heart.
- On any suspicion of a hormonal disorder, refer to a physician in writing on the standard form, not by verbal advice in the changing room.
- Record the request and their own answer: date, the request verbatim, the answer verbatim, the referral, a signature. This record protects the coach in a dispute.
- Know the anti-doping rules if the client competes.
What a coach never does
- Does not name drugs, doses, protocols or cycles, and does not compare substances with one another.
- Does not recommend "safer options" and does not hint where to get anything.
- Does not interpret laboratory results. Interpreting a test is making a diagnosis regardless of the caveats attached to it: "I am not a doctor, but you can see it in the numbers" is already a diagnosis.
- Does not supervise "post-cycle therapy" and does not take on guiding a person through a cycle.
This is not over-caution. The EuropeActive negative list, adopted in the programme as canonical, explicitly forbids a coach from prescribing medicines and dietary supplements and from making a diagnosis. Selecting and discontinuing hormone therapy is medical practice. A coach who does it is personally liable, and no phrasing along the lines of "he asked for it himself" will protect them.
The referral route looks like this: general practitioner, then endocrinologist or andrologist-urologist; cardiologist for cardiac complaints; dermatologist for skin manifestations; psychiatrist-addiction specialist where there are signs of dependence and aggression. Separately, a coach must know the signs that call for an ambulance rather than a referral form.
There is an anti-doping layer as well. Under Article 21.2 of the World Anti-Doping Code, a coach as athlete support personnel is a bound party in their own right, and Articles 2.8 and 2.10 make them personally sanctionable for complicity and for prohibited association.
How to talk to someone who has already decided
Bans do not work. Moralising does not work. Three questions work:
- Do you want children, and on what timeline?
- Are you prepared for replacement therapy to become lifelong?
- Which physician will be managing you?
If there is no answer to any of the three, the person has not made a decision — they have only announced one. And there is almost always a simpler conversation to have: in the overwhelming majority, the reserve of natural progress is not exhausted, because sleep, nutrition and training volume have not been sorted out.
What is still open
A textbook is obliged to name the limits of knowledge rather than pretend they do not exist.
- Good prospective studies of the natural course of axis recovery are scarce. The main evidence base consists of case descriptions and systematic reviews of those descriptions.
- It is not possible today to predict in advance whose axis will recover fully and whose will not.
- The Endocrine Society statement of 16 July 2026 specifically emphasises the remaining uncertainty about the long-term safety of testosterone therapy itself.
- The section on cardiovascular and hepatic consequences in the teaching module is written from generally accepted positions and still needs to be underpinned by specific meta-analyses. We say so openly.
Myths
- "Everything comes back a couple of months after the cycle." For most it is not a couple of months, and for some it does not come back fully.
- "Small doses are safe." The axis shuts down from small amounts too. The difference is in speed, not in whether it happens.
- "Testosterone is just a vitamin for men." It is a hormone with feedback. Introduced from outside, it switches off your own.
- "If the labs are low, you should inject." A diagnosis is symptoms plus repeat confirmed morning measurements, and the decision belongs to a physician.
- "Infertility only happens to those who abuse." Suppression of spermatogenesis is an expected effect, not a rare complication.
PROFORM DINAMO, Mirzo Ulugbek Avenue 8a, Tashkent. The club is open around the clock and a club tour is free. Our coaches do not select drugs and do not interpret lab results — they build training, sleep and nutrition, and refer to a physician in good time. To book or ask a question: +998 94 045 54 48.