The HGH-191AA Pre-Filled Pen puts research-grade recombinant human growth hormone (somatropin, 191 amino acid sequence) into a ready-to-use injection pen. Each HGH pen arrives pre-filled in a sealed 3 mL cartridge with an adjustable dose dial, so there is no vial to reconstitute, no syringe to draw, and no guesswork. Select the total-IU strength that fits your protocol and dial the exact amount you need per administration.
What Is HGH-191AA?
HGH-191AA is recombinant human growth hormone produced to match the full 191-amino-acid sequence of endogenous somatropin. It is one of the most widely studied compounds in growth, metabolism, and recovery research. Our pens are filled with high-purity material verified at greater than 98.5% purity.
What Is HGH-191AA Researched For?
Researchers study somatropin for its role in cellular growth and repair, lean-tissue development, lipolysis and body-composition models, connective-tissue and recovery pathways, sleep-cycle research, and IGF-1 signaling. The 191AA sequence is the standard reference form used across the majority of published growth-hormone literature.
Why the Pre-Filled Pen?
Traditional HGH ships as a lyophilized powder that must be reconstituted, refrigerated, and drawn with an insulin syringe. Our pre-filled pen removes those steps. The compound is already suspended, the dose is dialed rather than measured, and the cartridge protects the material from repeated puncture and contamination. It is the cleanest, most consistent way to run an HGH research protocol.
Pen Specifications
- Compound: HGH-191AA (recombinant somatropin, 191AA)
- Format: Pre-filled 3 mL cartridge pen, adjustable dose dial
- Strengths: 10, 11, 15, 18, 26, 36 and 42 total IU per pen
- Purity: >98.5%
- Ready to use: No reconstitution, no mixing, no separate syringe
Dosing Reference — How Long Each Pen Lasts
Each pen holds its full labeled IU. The table below shows approximately how many days a single pen provides at common research amounts per day.
| Pen Strength | Total IU | @ 1 IU/day | @ 2 IU/day | @ 3 IU/day |
|---|---|---|---|---|
| 10 IU | 10 IU | 10 days | 5 days | 3.3 days |
| 11 IU | 11 IU | 11 days | 5.5 days | 3.7 days |
| 15 IU | 15 IU | 15 days | 7.5 days | 5 days |
| 18 IU | 18 IU | 18 days | 9 days | 6 days |
| 26 IU | 26 IU | 26 days | 13 days | 8.7 days |
| 36 IU | 36 IU | 36 days | 18 days | 12 days |
| 42 IU | 42 IU | 42 days | 21 days | 14 days |
Handling & Storage
Store refrigerated at 2–8 °C and keep away from direct light. Do not freeze. Allow the pen to reach room temperature before use and return it to refrigeration promptly. Handle with standard aseptic laboratory practice.
For Research Use Only. Not for human consumption. This product is intended strictly for laboratory and research applications.
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