Research-grade compound. Laboratory use only. Not intended for human or animal use, ingestion, or injection. No medical claims are made or implied.
≥98% PurityIn-House HPLC & MS Tested
HormonesSKU: CP-HGH
HGH 191AA
≥99% PurityHPLC & MS verified
From €17.99In Stock
Only 10left in stock — order soon
Delivers to EU in 7-10 business days
Free shipping over €200 · no customs paperwork (EU) · via EU carrier network
Research-grade HGH 191AA. 99.3% avg purity, HPLC & MS verified. Lyophilized powder in sealed glass vial. For laboratory research use only. Not for human consumption.
Volume PricingApplied automatically at checkout
| Quantity | Price Each | Total | Savings |
|---|---|---|---|
| 1 unit | €17.99 | €17.99 | -- |
| 3+ | €17.09 | €51.27 | 5% off |
| 5+Most Popular | €16.19 | €80.96 | 10% off |
| 10+ | €15.29 | €152.91 | 15% off |
Size
Please select a size to continue
Earn 17 loyalty points with this purchase
1
Total: €17.99
Free shipping on orders over €200
Important Notice
This product is intended for laboratory and research use only. Not for human or veterinary use. By purchasing, you confirm this product will be used exclusively for in-vitro research purposes.
When This Product May Not Suit Your Research
- ⚠If your research requires GMP-grade material for clinical applications — research-grade peptides are not intended for clinical use.
- ⚠If your lab lacks proper cold storage (-20°C freezer) — this peptide's stability may be compromised at higher temperatures.
- ⚠If your study protocol requires FDA-approved reference standards — contact USP or a certified reference material provider.
Purity HPLC
99.3% average HPLC purity, verified by independent third-party testing
Third-Party Tested
Janoshik report published when available
Fast Shipping
24h dispatch, EU-wide shipping from €4.99
Third-Party Tested
Independent lab verification for every batch
Last reviewed: 2026-04-15
About HGH 191AA
HGH 191AA is recombinant human growth hormone with the full 191 amino acid sequence identical to endogenous pituitary-derived GH. It is produced via recombinant DNA technology in E. coli or CHO cell expression systems, providing a research-grade supply of the same hormone used in clinical somatropin preparations. Each vial contains a specified amount in IU (international units), with the standard conversion for research-grade GH being approximately 3IU per mg.
Endogenous growth hormone is a 22kDa protein with pleiotropic effects: it stimulates IGF-1 production in the liver (the primary mediator of GH's anabolic effects on bone and muscle), regulates lipolysis in adipose tissue, influences carbohydrate metabolism, supports immune function, and has roles in sleep architecture. GH is secreted in pulses throughout the day, with the largest pulse occurring in deep sleep -- a pattern that matters for research design, since sustained elevated GH (as with continuous infusion) produces different downstream effects than pulsatile delivery.
For researchers, recombinant HGH enables study of the complete GH axis pharmacology -- GH receptor binding, JAK/STAT signaling, downstream IGF-1 production, and all the downstream metabolic effects -- using a well-characterized and clinically validated molecule.
Research Applications
Recombinant HGH is used in research on growth hormone axis biology, body composition (lean mass, fat distribution), bone metabolism, IGF-1 signaling, metabolic regulation, aging and GH deficiency models, and as a positive control for GH secretagogue research.
Specifications
| Parameter | Value |
|---|---|
| Compound | Recombinant Human Growth Hormone (somatropin) |
| Sequence | 191 amino acids, identical to endogenous pituitary GH |
| Purity | 99.3% avg (SDS-PAGE and HPLC verified) |
| Format | Lyophilized powder |
| Reconstitution | Bacteriostatic water |
| Storage | 2-8°C lyophilized; 2-8°C after reconstitution |
Storage
Lyophilized HGH should be stored at 2-8°C (refrigerator) rather than frozen -- freezing can damage the protein structure. After reconstitution with bacteriostatic water, store at 2-8°C and use within 28 days. Do not shake -- gently swirl to dissolve.
What does 191AA mean and why does it matter?
191 amino acids is the complete length of endogenous human growth hormone. Some lower-quality research preparations (sometimes called "192AA") contain an extra methionine residue at the N-terminus due to bacterial expression systems that don't cleave the initiator methionine correctly. This extra methionine can increase immunogenicity -- stimulating antibody formation against the GH -- which confounds long-term research. True 191AA GH matches the endogenous sequence exactly, reducing this problem and making it appropriate for extended studies.
How does growth hormone produce its anabolic effects?
GH's anabolic effects on muscle and bone are largely mediated indirectly through IGF-1. GH stimulates hepatic IGF-1 production, and circulating IGF-1 then binds IGF-1 receptors in muscle and bone to drive protein synthesis, satellite cell activation, and bone matrix production. GH also has direct effects on adipose tissue lipolysis that are independent of IGF-1. This dual mechanism -- direct fat metabolism effects plus indirect IGF-1-mediated anabolic effects -- is why GH replacement produces body composition changes (reduced fat, increased lean mass) in GH-deficient models.
Why does storage temperature matter for HGH (refrigerator not freezer)?
Growth hormone is a protein, and freeze-thaw cycles can cause aggregation and denaturation that reduce biological activity without necessarily producing visible changes. Lyophilization (freeze-drying) removes water content and provides stability, but the reconstituted solution should be kept at 2-8 degrees C rather than frozen again. The bacteriostatic water used for reconstitution helps prevent microbial contamination during the multi-week storage period. For the lyophilized cake, refrigerator storage is acceptable and preferable to freezing to maintain protein integrity.
HGH 191AA is supplied for laboratory research use only. Not approved for human use outside of licensed pharmaceutical preparation. Handle in compliance with institutional biosafety guidelines.
Specification Summary
Purity99.3% avg
FormLyophilized Powder
Storage-20\u00B0C
Researcher Confidence
Why researchers choose CertaPeptides
Who actually tests this?
Every batch is independently verified by Janoshik Analytical (100,000+ verifications/month), Eurofins Scientific, and Analytical Sciences International. We publish every Certificate of Analysis.
View COAs →What if I get the wrong batch?
Every bottle label carries a lot number that maps to a specific Certificate of Analysis. If a batch fails spec, we don't ship it — full stop.
View COAs →Where does it ship from?
Romania (EU). We are CERTALAB SRL, CUI RO54451735, VAT-registered. SameDay for Romania, FanCourier for Central/Eastern EU, TCE Worldwide for the rest. 3–7 business days EU-wide.
Shipping details →What if there's a problem?
You have a 14-day withdrawal right under OUG 34/2014 (Romanian/EU consumer law), with ANPC/ODR escalation available. Contact us at support@certapeptides.com.
Returns policy →Product Information
This product is intended for scientific research and development purposes only. It is a chemical substance that shall not be used as a drug, medicine, active substance, or ingredient in any product intended for human or animal consumption. Researchers must handle this compound in accordance with their institutional biosafety guidelines. Use only in properly equipped laboratory settings with appropriate personal protective equipment.
Frequently Asked
Research Library
Related Research Articles
Based on category & popularity
Researchers Also Studied
SAME FIELDHormones
HGH Fragment 176-191
AOD-9604 is a modified peptide fragment corresponding to amino acids 176-191 of human growth hormone, with a tyrosine substitution at the C-terminus. It has been specifically studied for its lipid metabolism pathway signaling independent of growth-promoting effects. Modified hGH fragment (176-191) with C-terminal tyrosine Lipid metabolism pathway and adipose tissue signaling research Lipid metabolism signaling without somatotropic pathway activation For research purposes only.
From€18.99
SAME FIELDHormones
Hexarelin Acetate
Hexarelin is a synthetic hexapeptide growth hormone secretagogue and one of the most potent GHS-R1a receptor agonists studied. It has been researched for its strong growth hormone-releasing properties and cardioprotective effects. Potent synthetic GH secretagogue hexapeptide Growth hormone release and axis stimulation Cardiovascular and cardioprotective research For research purposes only.
From€22.99
SAME FIELDHormones
Tesamorelin
Research-grade Tesamorelin. 99.3% avg purity, HPLC & MS verified. Lyophilized powder in sealed glass vial. For laboratory research use only. Not for human consumption.
From€18.99
SAME FIELDHormones
HCG
Research-grade HCG. 99.3% avg purity, HPLC & MS verified. Lyophilized powder in sealed glass vial. For laboratory research use only. Not for human consumption.
From€22.99