Vial sizes vary by vendor. Smaller bottles are usually 3 mL; larger bottles are often 10 mL. Match the label on the vial you actually bought, then use the calculator below if you need to adjust.
Overview
HCG mimics LH, directly stimulating the testes to produce testosterone. It’s the standard tool for keeping testicular function alive during TRT and restarting it after a cycle. Dosed in IU, so the unit math is different from mg-based peptides.
Preparation
Reconstitute a 5,000 IU vial with 2 mL of bacteriostatic water (BAC) for a 2,500 IU/mL concentration. At this concentration, 1 unit on an insulin syringe = 25 IU. Refrigerate after mixing.
| Vial | BAC | Concentration |
|---|---|---|
| 10 mg | 2 mL | 5 mg/mL |
Protocol
| Period | Dose | Units (@ 5 mg/mL) | Frequency |
|---|---|---|---|
| Weeks 1–12 | 500 IU | 20 units (0.20 mL) | 3x/week (Mon/Wed/Fri) |
| Short blast (Weeks 1–4) | 1,500–2,000 IU | 60–80 units (0.60–0.80 mL) | 3x/week |
| PCT taper (Weeks 1–12) | 1,500 → 2,000 → 1,000 IU | 60 → 80 → 40 units | 3x/week |
Cycle
Maintenance: 500 IU 3x/week throughout TRT. Post-cycle: 2,000 IU 3x/week for 3 weeks, then taper. 12-week protocols are common.