HGH (Somatropin) Pen Dosage Protocol

Quick Start

The short version

If you only read one thing, read this. The four cards below are the whole protocol in plain English — the sections that follow just add the detail.

Dosage Chart

Handling

Dosing & Reconstitution Guide

The pen is pre-filled and reconstituted per manufacturer instructions. Attach a fresh pen needle, prime, dial dose in IU, and inject subcutaneously.

Subcutaneous Protocol

Frequency: once daily subcutaneously, typically in the evening to align with the natural GH pulse. Slow uptitration reduces water retention and joint discomfort.

Supplies Needed

Plain-English Glossary

Jargon, translated

A quick decoder for the terms you'll see across this page.

Subcutaneous (subQ)

Injected into the fatty layer just under the skin — not into muscle or vein. Easier and less painful than an IM shot.

Reconstitution

Mixing a dry powder with liquid (bacteriostatic water) to turn it into an injectable solution.

Lyophilized

Freeze-dried. The peptide arrives as a dry powder so it stays stable during shipping.

Bacteriostatic water

Sterile water with a tiny amount of preservative that prevents bacteria growth — used to mix peptides.

Units (on an insulin syringe)

The small tick marks on a U-100 syringe. 100 units = 1 mL. Most doses are just a few units.

Half-life

How long it takes your body to clear half of a dose. Guides how often you inject.

Titration

Starting low and slowly increasing the dose so your body can adjust.

Protocol Overview

• Goal: Support GH-axis research contexts.
• Schedule: Daily evening subcutaneous injection.
• Dose range: 1–4 IU per administration.
• Storage: Refrigerated, protected from light.

Dosing Protocol

• Start: 1 IU once daily for two weeks.
• Titrate by 1 IU every 2 weeks up to reference dose.
• Timing: Evening administration aligns with natural GH release.
• Cycle length: Reference protocols run 12–24 weeks.

Storage Instructions

• Lyophilized product: room temperature, sealed and protected from light. Refrigeration acceptable.
• Reconstituted product: 2–8 °C (35.6–46.4 °F) refrigerated, protected from light.
• Do not freeze reconstituted solution.
• Allow to reach room temperature before administration to reduce injection-site response.

Important Notes

• Use a new sterile syringe for each administration.
• Rotate injection sites (abdomen, thighs, upper arms) to reduce local irritation.
• Discard the vial if the solution becomes cloudy, discolored, or shows particulates.
• Document daily dose and site rotation for consistency.
• Monitor for water retention, carpal-tunnel-type symptoms, and elevated fasting glucose — all dose-dependent.

Mechanism

How This Works

Potential Benefits & Side Effects

• Increased lean mass and reduced fat mass reported in GH-research protocols.
• Improved skin quality and connective-tissue metrics reported.
• Reported improvements in sleep quality and recovery.
• Common adverse effects: water retention, joint stiffness, transient hyperglycemia.

Lifestyle Factors

• Maintain adequate protein and resistance training to leverage anabolic signaling.
• Monitor fasting glucose during longer protocols.
• Prioritize sleep — GH-driven repair is largely nocturnal.
• Limit refined-carbohydrate loads near injection time.

Injection Technique

1. 1. Attach a fresh pen needle and prime.
2. 2. Clean the injection site with alcohol.
3. 3. Dial the target IU dose.
4. 4. Pinch a skinfold; insert at 45–90° subcutaneously.
5. 5. Depress fully, hold 5–10 seconds, withdraw.
6. 6. Dispose of the needle in a sharps container.

References

1. 1

   Molitch et al., J Clin Endocrinol Metab (2011)

   Evaluation and treatment of adult growth-hormone deficiency

   View source
2. 2

   Rudman et al., NEJM (1990)

   Effects of human growth hormone in men over 60

   View source