If you've used anabolic steroids, your body has shut down its natural testosterone production. This is not a maybe. This is what happens. The question is not whether it's suppressed—the question is how you restore it.
Post-cycle therapy (PCT) is the protocol for restarting your natural hormonal system after exogenous testosterone suppression. It's not optional. Without it, your testosterone remains low for weeks or months, and you lose muscle, strength, motivation, and sexual function.
This is evidence-based harm reduction information. If you're using steroids, you need to understand what happens to your body and how to manage it responsibly.
How Steroids Suppress Your HPTA
Here's the basic physiology.
Your hypothalamic-pituitary-testicular axis (HPTA) is a feedback loop. Your hypothalamus releases GnRH (gonadotropin-releasing hormone), which signals your pituitary to release LH (luteinising hormone) and FSH (follicle-stimulating hormone). These hormones tell your testes to make testosterone.
When you inject exogenous testosterone, your body senses adequate testosterone. The feedback loop says: "We've got enough. Stop making it." GnRH drops. LH drops. FSH drops. Your testes receive no signal to produce testosterone, so they stop. Over weeks, your testes literally atrophy—they shrink because they're not being used.
This is called secondary hypogonadism. You have an intact testicular system, but it's been told to go to sleep.
During a steroid cycle, this doesn't matter. You're injecting testosterone (or another anabolic), so you have adequate androgen in your system. The problem arises when you stop.
When you stop injecting, exogenous testosterone levels drop. Your body now has no testosterone (because you've shut down endogenous production) and no exogenous source. You're in a state of profound hypogonadism.
Without PCT: Your body slowly restarts natural testosterone production. This can take 6 months to over a year, depending on cycle length and compounds used. You're low-testosterone for months. You lose muscle, strength, motivation, libido. It's miserable.
With PCT: You use medications to stimulate your pituitary to restart LH and FSH production, which signals your testes to start making testosterone again. The recovery is much faster: 4–8 weeks typically.
What Happens Without PCT
Let's be specific about the consequences.
Immediately after stopping a cycle: Your exogenous testosterone clears. Testosterone levels crash. You go from 800–1200 ng/dL (on cycle) to 50–200 ng/dL (post-cycle without PCT). You're below the normal range.
Weeks 1–4: You feel the drop acutely. Energy tanks. Motivation disappears. Libido crashes. Mood suffers. You look flat in the mirror as glycogen and water drop. Strength drops noticeably.
Weeks 4–12: Your body begins to restart natural production, but it's slow. Testosterone gradually climbs from 50 ng/dL toward 200–300 ng/dL. You're still in a hypogonadal state. Muscle loss continues. Strength is compromised. Mood issues persist.
Weeks 12–26: Testosterone continues to climb, but progress is glacial. You might reach 400–500 ng/dL by week 20, but full recovery to 600+ ng/dL can take 6+ months.
If the cycle was long or the compounds were long-acting, recovery is even slower.
The consequence: months of low testosterone, during which you lose 20–30% of the muscle you gained. The gains weren't all sustainable, but the loss is real. You'd have kept much more of it if you'd done PCT.
PCT Protocols: SERMs
SERMs are selective oestrogen receptor modulators. They block oestrogen receptors in the hypothalamus and pituitary, which (paradoxically) triggers more GnRH and LH release. This stimulates your testes to restart testosterone production.
The two standard SERMs are:
Clomiphene (Clomid)
What it does: Clomiphene blocks oestrogen receptors in the hypothalamus. This is sensed as "low oestrogen," which triggers higher GnRH secretion. More GnRH → more LH → more testosterone production from your testes.
Dosing: Standard PCT protocol is 50 mg daily for 4–6 weeks. Some protocols use a taper (e.g., 50 mg for 2 weeks, then 25 mg for 2 weeks).
Timeline: LH rises within 3–5 days. Testosterone production begins within days. Most men see testosterone rising noticeably by week 2.
Side effects: Clomiphene can cause visual disturbances (floaters, blurred vision), which are usually temporary but can be concerning. Mood changes, headaches, and nausea are less common but occur. The visual effects are why some men prefer tamoxifen.
Evidence: Clomiphene restarts testosterone production effectively. Studies show LH recovery in 5–7 days and testosterone recovery to baseline (500–700 ng/dL) in 4–6 weeks in most men.
Tamoxifen (Nolvadex)
What it does: Tamoxifen also blocks oestrogen receptors, but has slightly different tissue selectivity than clomiphene. The mechanism for restarting testosterone is the same.
Dosing: Standard PCT protocol is 20 mg daily for 4–6 weeks.
Timeline: Similar to clomiphene—LH rises within days, testosterone production begins acutely.
Side effects: Tamoxifen is generally better tolerated than clomiphene. Visual disturbances are less common. Some men report mood effects.
Evidence: Equally effective to clomiphene for HPTA recovery.
Clomiphene vs. Tamoxifen
In practice, they're very similar. Tamoxifen is often preferred because visual side effects are rarer. Clomiphene is cheaper. If you're on one and tolerating it poorly, the other is a reasonable alternative.
The Newer Option: Enclomiphene
Enclomiphene is the active isomer of clomiphene (clomiphene is a 50/50 mix of enclomiphene and zuclomiphene). Enclomiphene has a shorter half-life and potentially fewer side effects.
It's not yet available in the UK for this indication, but it's being used off-label in some clinics. The evidence is emerging but promising. It may become more standard.
For now, clomiphene or tamoxifen remain the standard SERMs.
HCG During Cycle (Prevention)
HCG (human chorionic gonadotropin) is a hormone that mimics LH. If you inject HCG during your cycle, it signals your testes to stay active and produce testosterone even while you're suppressed with exogenous steroids.
The benefit: Your testes don't atrophy. When you stop the cycle and PCT, your natural production recovers faster because your testes are already "warmed up."
Standard protocol: 250–500 IU HCG twice weekly during and for 1–2 weeks after your cycle.
Timing: HCG should start before your testicular shutdown becomes severe. Ideally, use it mid-cycle onward, not after atrophy has already occurred.
Note: HCG requires careful dosing. Too much can suppress LH (the very hormone you're trying to stimulate). The research on optimal dosing is limited, but 250–500 IU 2–3x weekly is standard.
If you use HCG during your cycle, your subsequent PCT is simpler and faster.
PCT Bloodwork: What to Monitor
Before starting PCT, get bloodwork. You want baseline:
- Total testosterone (should be low immediately post-cycle)
- LH (very low immediately post-cycle)
- FSH (very low immediately post-cycle)
- Oestradiol (may be elevated)
During PCT (week 2–3): Retest testosterone and LH to confirm they're rising. If they're not, something is wrong (non-genuine medication, inadequate dosing, or ongoing suppression).
After PCT (week 4–6): Retest total testosterone, LH, FSH, SHBG. Make sure testosterone has recovered to pre-cycle levels and LH/FSH are normal.
If testosterone hasn't recovered by week 6–8, you may need to extend PCT or investigate further (thyroid, prolactin, etc.).
PCT Timeline Summary
Immediate (Day 1 post-cycle): Testosterone levels are crashing. SERM should start now.
Week 1–2: Exogenous testosterone clears. LH begins rising on SERM. Testosterone production is beginning but still low.
Week 2–4: Testosterone rises noticeably. LH is normalising. You should feel energy and motivation improving.
Week 4–6: Testosterone continues to rise toward baseline. LH/FSH should be normalising. You're feeling much better.
Week 6–8: Full recovery for most men. Testosterone at 500–700 ng/dL (or whatever your baseline was). SERM can be discontinued.
If recovery isn't happening by week 6, extend PCT or retest. Most of the time, extending SERM for another 2 weeks completes recovery.
Duration and Cycle Length
Longer cycles require longer PCT.
- Short cycle (6–8 weeks, short-acting compounds like testosterone propionate): Standard 4-week PCT is usually sufficient.
- Medium cycle (10–12 weeks, medium-acting compounds): 4–6 week PCT is standard.
- Long cycle (16+ weeks, long-acting compounds like testosterone enanthate): 6–8 week PCT may be necessary.
The rule: longer suppression = longer recovery time.
Important Caveats
This is information, not endorsement. Anabolic steroid use carries significant health risks: cardiovascular problems, liver damage, hormonal disruption, psychiatric effects, and infertility. PCT mitigates the hormonal disruption but doesn't eliminate the other risks.
PCT requires genuine, quality medications. Counterfeit SERMs exist. Get your PCT from a reliable source with verifiable authenticity.
Medical supervision is ideal. If you're using steroids, a knowledgeable doctor who will monitor your health is invaluable. Some private clinics specialise in this.
Natural recovery is an option. It's slow (6+ months), but it happens. Some men choose to recover naturally for health reasons or unavailability of PCT medication.
The Bottom Line
If you suppress your HPTA with steroids, you need PCT to recover your natural testosterone production reasonably quickly. The alternatives—waiting 6–12 months for natural recovery—result in months of low testosterone, muscle loss, and mood problems.
SERMs (clomiphene or tamoxifen) are the standard. 4–6 weeks of 50 mg clomiphene or 20 mg tamoxifen daily restores most men to normal testosterone levels in that timeframe.
HCG during cycle reduces atrophy and speeds recovery.
Bloodwork confirms recovery is happening.
This is evidence-based harm reduction. If you're in this situation, implement it properly.
Affiliate note: Bloodwork links via Medichecks and similar services.
Medical disclaimer: This is educational information, not medical advice. PCT should be undertaken under medical supervision where possible. Some of these medications are prescription-only in the UK and other jurisdictions.