What HCG does on TRT
HCG (human chorionic gonadotropin) mimics LH at the testicular receptor. When you take exogenous testosterone, the brain stops sending LH to the testes, so the testes stop producing testosterone, sperm, and the supporting cast of testicular hormones. HCG bypasses the brain and tells the testes directly: keep working.
The fertility argument
Standard TRT alone makes 90%+ of men functionally infertile within 12 months. HCG concurrent with TRT preserves spermatogenesis in 80-90% of men. This is the dominant reason most men add HCG.
If you're considering future children, or even leaving the option open, HCG is the simplest insurance. Without it, you'll need a restart protocol or a sperm bank deposit. See fertility on TRT.
Testicular volume
Without LH stimulation, the testes shrink, typically 20-40% reduction in volume after 6-12 months on TRT alone. This is reversible (volume returns when stimulation resumes), but bothers many men. HCG maintains volume during TRT.
Hormonal completeness
The testes produce more than just testosterone, they also produce DHT, estradiol, pregnenolone, and other steroids. TRT alone delivers only testosterone. Adding HCG keeps the testicular factory online, producing the full spectrum.
Whether this matters clinically is debated. Most men feel better on TRT + HCG than on TRT alone, but blinded studies are limited. The "feel" may be partly testicular volume and partly the broader hormonal picture.
Side effects
HCG is generally well tolerated. Possible issues:
- Slight estradiol elevation (HCG also stimulates aromatase activity)
- Acne in some men
- Mild testicular sensitivity in first weeks
- Injection site irritation
- Mood variability (less common)
Most issues respond to dose adjustment.
Dosing
| Goal | Typical dose |
|---|---|
| Fertility preservation | 500 IU SubQ 2-3x weekly |
| Testicular volume only | 250 IU SubQ 2x weekly |
| Pre-TRT cessation | 1500 IU EOD for 2-4 weeks |
The decision framework
Add HCG if:
- Future fertility may matter
- You want to preserve testicular volume
- You want the broader hormonal output
- You're young (under 35) and starting TRT
Skip HCG if:
- Family is complete and you're not concerned about volume
- You prefer the simplest protocol
- You have specific contraindications
- You've tried it and didn't notice benefit
The principle: HCG isn't required for TRT to work, but it adds meaningful benefits that matter to many men. The decision is yours, informed by your physician.
Bottom line
HCG is a legitimate addition to TRT for fertility preservation, testicular volume, and a more complete hormonal picture. The question isn't whether HCG is "good", it's whether the benefits matter enough for your goals. For most men under 40 starting TRT, the answer is usually yes.