HCG reconstitution calculator

HCG at a glance

5000IU vial + 2mL BAC water = 20 units = 500IU — Frequency: 2-3x weekly — Best taken: consistent schedule, any time

Full HCG dosing reference — reconstitution per vial size, dose-to-units table, side effects and sources.

What it does

• Commonly used off-label alongside testosterone replacement therapy (TRT): HCG mimics the body's natural LH signal, which keeps the testicles active and producing testosterone instead of shrinking and shutting down as they normally would on TRT alone. Also used after stopping TRT to help restart the body's own natural hormone production.
• Human chorionic gonadotropin — a naturally occurring hormone (not a synthetic peptide) that mimics luteinizing hormone.
• FDA-approved for fertility treatment and certain hormonal conditions.
• Well-established mechanism backed by decades of medical use, unlike most other entries in this list.

Combining with additional exogenous testosterone can push hormone levels well above normal, raising the risk of mood swings, acne, and cardiovascular strain — coordinate dosing with your prescriber rather than stacking on your own. HCG also shares structural similarity with TSH and has weak, dose-dependent thyroid-stimulating activity, but that effect is documented at the hCG levels of pregnancy and trophoblastic disease, far above what an injected protocol reaches, and is not established at typical use — mention it to your prescriber anyway if you take thyroid medication.

Notes

Listed maintenance protocol: 500IU x2-3/week (1000-1500IU/week), typically run 8-16 weeks. Higher "recovery" doses (1500-2500IU per injection) follow a different protocol — dosed in IU, not mg/mcg. Both the 5000IU and 10000IU vials are standardly mixed with 2mL BAC water — the 10000IU vial just comes out twice as concentrated, so the same IU dose takes half the units.

Side Effects

• Injection site pain.
• Mild headache, gone within 1-2 weeks.
• Irritability or low mood in some men, settling within weeks.
• Gynecomastia, water retention, or acne at higher doses, via estrogen rise.

HCG vial sizes and concentrations

Standard water for each HCG vial size in the Dosify Me data, and the concentration it gives. One unit is 0.01 mL on a U-100 insulin syringe.

^* This size is conventionally mixed more concentrated rather than diluted further — fewer units per dose than smaller vials of this peptide.

Syringe units for the listed quantities, by vial size

Worked example for HCG

1. The example vial: 10000 IU of HCG, mixed with 2.00 mL of bacteriostatic water.
2. Concentration: 10000 IU ÷ 2.00 mL = 5000 IU/mL.
3. One syringe unit is 0.01 mL, so it holds 5000 IU/mL × 0.01 mL = 50 IU.
4. Example quantity: 500 IU.
5. Volume: 500 IU ÷ 5000 IU/mL = 0.1 mL.
6. Syringe reading: 0.1 mL × 100 = 10 units.

Label numbers from the Dosify Me data, used to show the arithmetic. Not a recommendation of any quantity.

Frequently asked

How many units is 500 IU of HCG?

At 2500 IU/mL (the standard mix for vials up to 5000 IU), 500 IU of HCG is 20.0 units on a 100-unit insulin syringe (0.200 mL).

How many units is 1000 IU of HCG?

At 2500 IU/mL (the standard mix for vials up to 5000 IU), 1000 IU of HCG is 40.0 units on a 100-unit insulin syringe (0.400 mL).

How much bacteriostatic water do I add to a 5000 IU vial of HCG?

2.00 mL, which gives 2500 IU/mL. Larger vials hold at most 2 mL of water, so they are mixed more concentrated and need fewer units per dose.

How much bacteriostatic water do I add to a 10000 IU vial of HCG?

2.00 mL, which gives 5000 IU/mL. This size holds at most 2 mL of water, so it is mixed more concentrated and the same dose is fewer units than from a smaller vial.

How often is HCG taken?

2-3x weekly. Consistent schedule (e.g. mon/wed/fri), any time Typical cycle: 8–16 weeks on, ~1 week off; repeat 2–3×/year.

Related pages and guides

• HCG dosing reference
• Peptide calculator in IU
• How much bacteriostatic water for a 5 mg vial?
• U-100 vs U-50 insulin syringe for peptides
• How to track peptide doses
• All peptide guides

Other calculators

General peptide calculator · BAC water calculator · Peptide dosing chart · How to reconstitute peptides · mcg to units chart