HCG (5000 iu Vial) Dosage Protocol

Dosing & Reconstitution Overview

Human chorionic gonadotropin (HCG) is a glycoprotein hormone studied for its ability to mimic luteinizing hormone at the LH receptor. The figures below are compiled strictly for laboratory and educational reference — they describe how the compound was handled and dosed across the published literature, not a recommendation for use in humans or animals.

For a 5000 iu vial, adding 2.0 mL of bacteriostatic water yields a concentration of 2,500 iu/mL. At that fill, every 0.10 mL drawn on a U-100 insulin syringe equals 10 units and delivers 250 iu, so one unit corresponds to 25 iu — which keeps the arithmetic straightforward across the dosing steps.

Standard Dosing Schedule

The standard schedule mirrors the low-dose maintenance regimens reported in the andrology literature, where a fixed amount was administered three times weekly to sustain gonadal stimulation without large swings in exposure.

Reconstitution Steps

1. Let the sealed lyophilized vial and the bacteriostatic water reach room temperature, then wipe both stoppers with an alcohol swab.
2. Draw 2.0 mL of bacteriostatic water and inject it slowly down the inside wall of the vial — never directly onto the powder pellet.
3. Swirl or roll gently until fully dissolved. Do not shake; foaming and aggressive agitation can shear the glycoprotein.
4. The solution should be clear and colourless. Label the vial with the concentration (2,500 iu/mL) and the reconstitution date.
5. Refrigerate immediately at 2–8 °C between uses and draw subsequent volumes with a fresh sterile syringe each time.

High-Dose Recovery Schedule

The recovery schedule reflects the more aggressive arms used to restart suppressed gonadal output, escalating into the first phase before stepping back down to a consolidation dose. It crosses higher per-injection volumes than the maintenance regimen.

Supplies Needed

• HCG vials (5000 iu): ~3 vials for an 8-week maintenance run at 1,500 iu/week; ~4 vials for 12 weeks; ~5 vials for 16 weeks.
• Insulin syringes (U-100, 1 mL): 24 for an 8-week schedule, 36 for 12 weeks, 48 for 16 weeks (one fresh syringe per draw).
• Bacteriostatic water (10 mL): one bottle reconstitutes several 5000 iu vials across a typical block.
• Alcohol swabs: a single 100-count box comfortably covers an 8–16 week schedule.

Protocol Overview

• Research goal: model gonadal stimulation and intratesticular androgen maintenance via LH-receptor activation.
• Schedule: three-times-weekly subcutaneous administration in the published maintenance model.
• Dose band: 500 iu per injection for maintenance, up to 1,500–2,500 iu in recovery arms.
• Fill: 5000 iu lyophilized, reconstituted to 2,500 iu/mL with 2 mL diluent.
• Storage: 2–8 °C dry; 2–8 °C once reconstituted (do not freeze).

Dosing Protocol Notes

• Hold maintenance at 500 iu three times weekly and keep the cadence fixed (e.g. Mon/Wed/Fri) for steady exposure modelling.
• Recovery arms front-load a higher dose, then taper to a consolidation step rather than escalating indefinitely.
• Typical block length runs 8–16 weeks; extend toward 16+ weeks where suppression in the model is more pronounced.
• Because HCG stimulates aromatase activity, estradiol is the marker most often tracked alongside dose changes.

Storage Instructions

Keep sealed lyophilized vials at 2–8 °C, protected from light, where they remain stable long term; brief periods at room temperature are tolerated. Once reconstituted with bacteriostatic water, refrigerate at 2–8 °C and use within about 60 days. Do not freeze — freezing denatures the glycoprotein. Discard the vial if the solution turns cloudy or shows particulates, and avoid leaving it at room temperature for extended periods.

Important Handling Notes

• Use a sterile syringe for every draw and never re-enter the vial with a used needle.
• Wipe the stopper with alcohol before each draw to keep the seal intact and uncontaminated.
• Allow refrigerated solution to warm slightly before drawing to ease measurement accuracy.
• Document each draw — date, volume, remaining material — for reproducibility.

How HCG Works

HCG is a glycoprotein hormone whose beta subunit gives it strong structural overlap with luteinizing hormone (LH). Because of that similarity it binds the same LH receptors on testicular Leydig cells and drives endogenous testosterone synthesis. Where native LH clears quickly (roughly a 30-minute half-life), HCG carries an extended half-life on the order of 36 hours, which produces sustained gonadal stimulation from far fewer injections. That durability is why it is studied as a tool for maintaining testicular function in settings where the body's own LH output is suppressed.

Reported Benefits & Side Effects

Benefits reported in the literature

• Preservation of intratesticular testosterone and spermatogenesis during exogenous androgen exposure.
• Prevention or reversal of testicular atrophy associated with suppressed gonadotropin signalling.
• Restoration of endogenous testosterone in hypogonadotropic and post-suppression scenarios.
• Downstream physiologic hormone output (e.g. pregnenolone, DHEA) beyond androgen alone.

Side effects reported

• Elevated estradiol from increased testicular aromatase activity, often prompting monitoring.
• Mild injection-site redness, swelling or discomfort that typically resolves quickly.
• Acne or oily skin secondary to rising testosterone and estradiol.
• Transient testicular aching as dormant Leydig cells reactivate; rare gynecomastia risk if estradiol climbs significantly.

Injection Technique (Reference Only)

• Wipe the stopper and the chosen site with alcohol swabs and let both dry before drawing or injecting.
• Pinch a fold of skin and insert subcutaneously at a 90° angle, or 45° for very lean handling; aspiration is not required for subcutaneous work.
• Inject slowly, wait 5–10 seconds, then withdraw at the same angle of insertion.
• Rotate systematically across the abdomen (2+ inches from the navel), outer thigh and back of the upper arm to avoid irritation and lipohypertrophy; dispose of sharps in an approved container.

References

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