Clomiphene vs Tamoxifen: side-by-side comparison
Clomid · Clomiphene Citrate · Serophene
A first-generation SERM that is a mixture of two isomers: 62% enclomiphene (trans, antagonist) and 38% zuclomiphene (cis, agonist). Works primarily at the hypothalamus to block estrogen negative feedback, increasing GnRH pulsatility and subsequent LH/FSH release. Produces a stronger initial LH/FSH spike than tamoxifen but with more side effects, particularly vision issues.
Nolvadex · Nolva · Tamox
A first-generation non-steroidal Selective Estrogen Receptor Modulator (SERM) that has been the gold standard for PCT since the 1970s. Acts as an estrogen antagonist in breast tissue and the hypothalamus/pituitary (stimulating LH/FSH release) while acting as an agonist in bone (protective) and liver. The cornerstone of most PCT protocols.
2 / 10 natty scale / 2
Same lane
Both sit in the same class and are run for pct, health. This is a like-for-like comparison: read the gaps as real trade-offs.
The tape
Core ratings
The same three rulers every entry on the site is scored with, read head to head.
Natty scale
1 natural · 10 heavy
Effectiveness
Documented effect · of 5Δ0.5
Side-effect severity
Documented burden · of 5Δ0.5
Cost side
Body-load fingerprint
Where each one actually lands its strain, on the calculator's thirteen channels. Tap a row for what it means and which labs track it.
Cardiometabolic
Hormonal
Systemic
Bars show strain at each one's typical protocol, not your dose. ≈ marks values inferred from side-effect data or category rather than hand-graded. For your numbers, run the calculator.
Logistics
The vitals
Benefit side
What each is for
Shared goals carry both dots; a goal with one dot belongs to that side alone.
Run for
Documented upside
- Stronger initial LH/FSH spike than tamoxifen
- Preserves and restores fertility (unlike TRT)
- Maintains intratesticular testosterone for spermatogenesis
- Well-established use since 1960s
- Can be used long-term for hypogonadism
Run for
Documented upside
- Proven PCT efficacy with decades of use
- Specifically targets breast tissue - effective gyno prevention
- Does not lower systemic estrogen (preserves estrogen benefits)
- Bone-protective estrogenic effects
- Long half-life allows for flexible dosing
The downsides
Side effects, aligned
Each entry's documented side effects, sorted onto the same body systems so the gaps and the overlaps are visible. Tap any effect for the detail.
None documented
None documented
The exit
Hormonal fallout & recovery
What each does to your own hormone axis while on, and what leaving it costs.
Clomiphene
Clomiphene IS a PCT drug. Standard protocol: 50/50/25/25 (mg/day for 4 weeks). Can be combined with Nolvadex for enhanced recovery. Start 3-5 days after last oral steroid, or 2-3 weeks after last long-ester injection.
Tamoxifen
Tamoxifen IS a PCT drug. Standard protocol: 40/40/20/20 (mg/day for 4 weeks). Start 2-3 weeks after last long-ester injection, or 3-5 days after last oral/short-ester dose. Can be combined with Clomid and/or preceded by HCG for enhanced recovery.
Read-out
How they separate
- 01
Enhancement
They land at almost the same point on the natty scale (2/10 vs 2/10): a similar distance beyond natural.
- 02
Side-effect bill
Clomiphene's documented side-effect severity is heavier (2.5/5 vs 2/5). The body-load fingerprint above shows where that weight actually lands.
- 03
Body load
The widest gap at typical protocols is blood thickness (Tamoxifen 3.5/10 vs 0/10), then mood & sleep (Clomiphene 4.4/10 vs 2.2/10).
- 04
Coming off
Neither requires PCT: both leave the natural testosterone axis running.
- 05
Tested athletes
Both are WADA-prohibited: neither belongs anywhere near tested competition.
Generated from each entry's data file. Descriptive, not a recommendation; nothing here is medical advice.