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≥99% purity verified by independent HPLC and mass spectrometry (MS) through Janoshik Analytical. Intended for laboratory research use only; not for human consumption, diagnosis, or treatment. View transparency report Compliance PDFs
HGH (somatropin) — recombinant 191aa human growth hormone, lyophilized and COA-tested to a ≥99% purity standard, studied in endocrine and GH–IGF-1 signaling research. Laboratory research use only.
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For laboratory research use only — not for human or veterinary use.
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Intended strictly for research and laboratory use only. Not for human consumption.
HGH supplied by Ares Research is recombinant somatropin (191 amino acid sequence) presented as a lyophilized powder in sealed vials, available in 10 IU through 36 IU sizes as single vials or 10-vial kits. Every unit is intended strictly for laboratory research use and is not a drug, supplement, or product for human or veterinary consumption.
Lyophilized vials are shipped with cold-chain packaging and should be transferred to refrigerated storage (2–8°C) on arrival. Unopened lyophilized material is generally stable under refrigeration for the period stated on the batch record; long-term holding is typically done at −20°C. Protect vials from light and avoid repeated temperature cycling, which is the most common cause of potency variance in growth hormone research material.
Reconstitution is performed with bacteriostatic water directed slowly against the vial wall rather than injected directly onto the cake. Somatropin is shear-sensitive: swirl gently until dissolved and never vortex or shake, as agitation drives aggregation and denaturation. Reconstituted solution should be clear and particle-free, held at 2–8°C, and discarded if cloudiness, precipitate, or fibrils appear. Our reconstitution calculator can be used to work out concentration per unit for a given vial size and diluent volume.
Each lot carries a printed batch ID that maps to a third-party certificate of analysis. Identity and purity are established by HPLC and mass spectrometry, with typical purity reported at ≥99%. Researchers can look the batch up in the public COA library, or request the full analytical packet for a specific lot before or after purchase, so on-hand material can be traced to its own test data rather than a generic brand-level claim.
Third-party purity testing available upon request.
| Compound | Recombinant somatropin (HGH), 191 amino acid sequence |
|---|---|
| CAS number | 12629-01-5 |
| Molecular formula | C990H1528N262O300S7 |
| Molecular weight | ≈22,125 Da |
| Appearance | White lyophilized powder, sealed vial |
| Presentation | 10, 12, 15, 20, 24, 36 IU vials; 10-vial kits |
| Typical purity | ≥99% by HPLC, identity confirmed by MS |
| Reconstitution | Bacteriostatic water, added slowly down the vial wall; swirl, never shake |
| Storage (lyophilized) | 2–8°C refrigerated; −20°C for long-term holding, protect from light |
| Storage (reconstituted) | 2–8°C; discard if cloudy or particulate forms |
| Batch documentation | Third-party COA per lot, batch ID printed on vial |
| Intended use | Laboratory research use only — not for human or veterinary use |
For laboratory research use only. Not for human consumption, diagnosis, or treatment.
Purity benchmarks, storage stability and batch documentation for the recombinant growth hormone material supplied for laboratory research use.
For research and laboratory use only. Not for human or veterinary use.
Recombinant human growth hormone is a 191-amino-acid single-chain polypeptide of approximately 22 kDa, stabilised by two intramolecular disulfide bridges. The 191aa sequence is identical to the dominant endogenous pituitary isoform, which is why it is used as the reference standard in growth-hormone research rather than the older 192-amino-acid (met-HGH) construct.
Material is supplied lyophilized in sealed vials with a documented batch identifier so that purity, identity, and reconstitution records can be tracked across a study. Assayed to a ≥99% purity standard with third-party analytical support available to qualifying research accounts.
In the published literature, growth hormone binds a preformed homodimeric GH receptor and drives rotational activation of the receptor subunits, recruiting JAK2 and phosphorylating STAT5. Secondary branches described in the same body of work include the MAPK/ERK and PI3K/Akt pathways. Hepatic STAT5 activity is the principal driver of IGF-1 transcription, which is why IGF-1 concentration is the standard downstream readout in GH-axis research models.
Because exogenous HGH bypasses hypothalamic-pituitary control, research comparisons with GHRH analogues and GHRPs focus on pulsatility and feedback intactness rather than absolute exposure — the distinction covered in the HGH vs peptide GH stimulation comparison.
Growth-hormone literature reports material in both mass (mg) and activity (IU) units. The conversion convention used across the somatropin literature is approximately 3 IU per 1 mg. Reproducible documentation records the vial mass, the diluent volume used, the resulting concentration per unit of volume, and the derived IU figure.
The reconstitution calculator performs those conversions for lab records. Figures are documentation aids, not protocol recommendations.
Lyophilized recombinant HGH is stable in its powdered form and is normally held refrigerated and protected from light, with long-term storage at -20 °C in stability studies. Reconstitution is typically performed with bacteriostatic water directed against the vial wall rather than injected into the cake, since growth hormone is sensitive to shear and foaming.
Reconstituted material is generally kept at 2–8 °C and not frozen, as freeze-thaw cycling is a documented source of aggregation and potency loss. Institutional SOPs take precedence over general reference information.
Batch-level analytics for growth hormone research material typically include HPLC purity, identity confirmation by mass spectrometry, and — where the protocol requires it — endotoxin and heavy-metal screening. Traceability matters because sequence variants, degradation products, and aggregate content can all confound receptor-level readouts.
Verified, non-placeholder batch records are published on the transparency page. Additional documentation is available on request to qualifying research accounts.
Growth hormone is one of the most extensively characterised endocrine proteins, with research spanning body-composition models, recovery and connective-tissue studies, and the somatopause and longevity literature that follows from the 1990 Rudman work. Ares Research publishes structured reference summaries of that literature rather than outcome claims.
Start with the HGH somatropin research overview or the growth hormone research hub.
All content on this page is reference material for licensed laboratory research. Nothing here is medical advice, a dosing protocol, or a claim of therapeutic benefit. Products are sold strictly for in-vitro and laboratory research use and are not for human or veterinary consumption.
Research-grade HGH is supplied directly by Ares Research from this catalog page. Each vial is lyophilized recombinant 191aa somatropin, assayed against a ≥99% purity standard, labelled with a batch identifier, and sold for laboratory research use only — not for human or veterinary use.
Every lot is assayed for identity and HPLC purity, with third-party analytical support available to qualifying research accounts. Published batch records can be looked up by batch identifier in the COA library before or after purchase.
HGH is supplied as a lyophilized powder in sealed vials, with the available kit and vial sizes listed in the selector on this page. Each vial carries a printed batch identifier so purity, identity, and reconstitution records can be tracked against a single lot.
Orders ship from the United States in discreet, insulated packaging with tracking. Lyophilized HGH is stable at ambient temperature for the short durations typical of domestic transit; on arrival it should be transferred to the storage conditions recorded for the lot.
Lyophilized vials are stored sealed, refrigerated, and protected from light. Once reconstituted, material is kept refrigerated and handled according to the receiving laboratory's own standard operating procedures and stability records.
They describe the same research material. Somatropin is the standardised name for recombinant human growth hormone, and 191aa denotes the 191-amino-acid single-chain sequence identical to the dominant endogenous pituitary isoform used as the reference standard in growth-hormone research.
For laboratory research use only. Not for human consumption, diagnosis, or treatment.
Reference data for laboratory personnel: molecular identity, storage and stability handling, our analytical testing panel, and peer-reviewed literature indexed on PubMed.
| Compound | HGH |
|---|---|
| Molecule type | Recombinant polypeptide (191 amino acids) |
| Class | Growth Hormone |
| Catalog category | Growth Hormone |
| Identity | Somatropin-identical sequence, E. coli expressed |
| Physical format | Lyophilized vial |
-20 °C, protected from light and moisture
24 months from date of manufacture in the sealed vial
2-8 °C (refrigerated), do not freeze after reconstitution
Stability studied out to approximately 28 days under continuous refrigeration
Verified by Janoshik Analytical — full panel, every batch. Second independent lab confirmation is being added batch by batch.
Quantifies the main peak against related-substance peaks, so the stated purity percentage is measured rather than assumed.
Every HGH lot passes all 8 stages before it is released. Expand a stage to see the method and why we run it.
Quantifies the main peak against related-substance peaks, so the stated purity percentage is measured rather than assumed.
Confirms the vial actually contains the labeled amount — purity alone says nothing about how much material is in the vial.
Confirms the measured molecular mass matches the declared compound — the check that catches a mislabeled or substituted vial.
Screens for elemental contaminants carried over from synthesis, reagents, or packaging.
Checks the finished lyophilized vial for microbial growth after fill and closure.
Measures bacterial endotoxin load, a contamination marker that purity testing alone will not reveal.
Ties the analytical numbers back to the paperwork — the lot you receive is the lot on the certificate.
A contamination check most research suppliers never run, and the reason we run it on every batch regardless of compound.
PASS reflects the batch release standard every lot must meet before it ships. Per-lot results are published on that lot's Certificate of Analysis.
Efficacy and Safety of Weekly Somatrogon vs Daily Somatropin in Children With Growth Hormone Deficiency: A Phase 3 Study
Deal CL et al. · The Journal of clinical endocrinology and metabolism, 2022 · PMID 35405011
View source[Use of recombinant Human Growth Hormone (rHGH)]
Calzada-León R · Revista medica del Instituto Mexicano del Seguro Social, 2017 · PMID 28296370
View sourcePharmacogenomics applied to recombinant human growth hormone responses in children with short stature
Stevens A et al. · Reviews in endocrine & metabolic disorders, 2021 · PMID 33712998
View sourceSpectroscopic analysis of recombinant human growth hormone in the presence of sucrose and trehalose
Kamrani S et al. · Biotechnology and applied biochemistry, 2023 · PMID 36807340
View sourceEffects of Recombinant Human Growth Hormone for Osteoporosis: Systematic Review and Meta-Analysis
Atkinson HF et al. · Canadian journal on aging = La revue canadienne du vieillissement, 2017 · PMID 28069090
View sourceReferences are listed for literature-identification purposes only. Ares Research is not affiliated with the authors, journals, or institutions cited.
This material is supplied for laboratory and research use only. It is not for human or veterinary use, and it is not a drug, food, or cosmetic. These statements have not been evaluated by the Food and Drug Administration. No information on this page is intended to diagnose, treat, cure, or prevent any condition.
Each HGH lot is validated at ≥99% purity by SDS-PAGE and HPLC, with a batch-specific COA available on the product page.
HGH is reconstituted with bacteriostatic water added slowly against the vial wall to avoid protein denaturation. Do not shake — swirl gently until fully dissolved.
Reconstituted HGH is typically stored at 2–8°C and remains stable for 14–21 days in most protocols. Follow your study SOP for exact limits.
Published growth hormone literature commonly reports both units. The conventional conversion used in the somatropin literature is approximately 3 IU per 1 mg of recombinant HGH. Researchers documenting protocols should record both the mass (mg) and the derived activity (IU) for each reconstituted vial, along with diluent volume, so results remain reproducible. This is reference information for laboratory documentation only and is not dosing guidance.
The 191aa designation refers to the 191-amino-acid sequence of recombinant human growth hormone (somatropin), which is identical in sequence to the endogenous 22 kDa GH isoform. Older recombinant material was produced as a 192-amino-acid (met-HGH) variant. Sequence identity matters in research models because it affects receptor binding behaviour and immunogenicity data in the published literature. Supplied for laboratory research use only — not for human or veterinary use.
Orders ship domestically from the United States. Lyophilized material is shipped in its stable powdered form, which tolerates normal transit conditions; the vial should be refrigerated on arrival and reconstituted only when required by the protocol. Tracking is issued automatically once a label is generated. All material is sold strictly for laboratory research use — not for human consumption.
HGH is the full 191-amino-acid recombinant protein and acts across the GH receptor and downstream IGF-1 axis. HGH Fragment 176-191 is a short C-terminal fragment studied primarily in metabolic and lipolysis research models and does not reproduce the full receptor signalling profile of the intact protein. They are studied for different research questions and are not interchangeable reference materials.
Each batch is produced to a ≥99% purity standard and supported by third-party analytical documentation. HPLC purity, identity confirmation, and — where applicable — endotoxin and heavy-metal testing may be provided on request to qualifying research accounts. Verified batch records that are not placeholders are published on the transparency page.
Lyophilized recombinant HGH is typically stored refrigerated and protected from light; long-term storage in the published stability literature is at -20 °C. After reconstitution with bacteriostatic water, material is generally kept at 2–8 °C and not frozen or agitated vigorously, since growth hormone is sensitive to shear and freeze-thaw cycling. Follow your institution's validated handling SOPs.
Reference primer on recombinant growth hormone — receptor signalling (JAK2/STAT5, MAPK, PI3K), pharmacokinetic characterisation, and the published literature base for somatropin in GH-axis research.
Exogenous HGH versus GHRH analogues and GHRPs — pulsatility, IGF-1 profiles, receptor sensitivity, and feedback intactness as described across the comparative research literature.
IU-to-mg conversion conventions, how physiological and supraphysiological ranges are defined in study models, and how dose-response data is reported in the published GH literature.
Review of documented mechanisms — lipolysis, IGF-1–mediated protein synthesis, and recovery markers — as examined across the published GH body-composition literature.
From the landmark 1990 Rudman study through current somatopause data, this review examines what the longevity research literature reports about GH-axis decline.
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Independent, documentation-first breakdowns of the vendors researchers most often ask about for this compound. COA verification, US shipping, and sourcing transparency, side by side.
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All testing documentation and COA data are provided for laboratory research use only and are not intended to support human consumption, diagnostic, or therapeutic use.
Independently tested by Janoshik Analytical. Verified and batch-tracked by Ares Research. Additional reports available upon request.
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