HGH 191AA
HGH 191AA · Recombinant Human Growth Hormone · Somatropin · 191 amino acid sequence
A synthetic recombinant form of human growth hormone with the identical 191-amino-acid sequence as endogenous somatropin. Widely studied for its effects on growth, body composition, and metabolic function. Distinct from GH secretagogues — HGH 191AA is the hormone itself, not a compound that stimulates its release. ManaWell Research does not currently stock HGH 191AA.
What HGH 191AA does — and how it works
HGH 191AA is a recombinant form of somatropin — the 191-amino-acid protein that is structurally identical to endogenous human growth hormone. The “191AA” designation refers to this complete amino acid sequence, distinguishing it from truncated or modified GH variants.
Growth hormone acts primarily through the GH receptor and via downstream IGF-1 production in the liver. Its effects span protein synthesis, lipolysis (fat breakdown), glucose metabolism, and cellular repair. FDA-approved pharmaceutical somatropin exists for specific indications; the research compound market sells recombinant GH for in-vitro and non-human research contexts.
What researchers study it for
| Area | What studies look at | Evidence |
|---|---|---|
| Body composition | Lean mass accretion and fat reduction; lipolytic effects in adipose tissue | Human + Animal |
| IGF-1 axis | Downstream IGF-1 elevation; anabolic signalling in muscle and bone | Well established |
| Cellular repair | Wound healing, organ regeneration, and collagen synthesis research | Animal |
| Metabolic effects | Insulin sensitivity, glucose metabolism, and lipid profile changes | Human + Animal |
| Anti-aging research | GH decline with age (somatopause); effects of restoration on body composition and function | Limited human |
HGH has an extensive clinical literature from pharmaceutical studies. Research compound HGH 191AA is intended to replicate the same molecule for non-clinical research purposes. Quality and purity vary significantly between research suppliers.
HGH vs. GH secretagogues
Peptides like Ipamorelin and CJC-1295 stimulate the pituitary to release its own GH. HGH 191AA bypasses that entirely — it is the hormone directly. The two approaches have meaningfully different pharmacokinetic profiles and research applications.
How to reconstitute HGH 191AA
HGH 191AA is supplied as lyophilized powder, typically in vials measured in International Units (IU). The standard reconstitution solvent is bacteriostatic water. Sterile water can be used if the entire vial will be used immediately, but BAC water is required for multi-dose vials. Do not use saline — this can damage the protein structure.
Note: HGH IU vials cannot use the standard mcg calculator. IU concentration depends on the specific product. Always confirm IU per mg with your supplier, as this varies.
Step-by-step
- Keep the vial cold before reconstitution. HGH is heat-sensitive — do not let it warm significantly before mixing.
- Swab both vial tops with separate swabs. Let air dry 10–15 seconds.
- Draw 1mL of BAC water into an insulin syringe.
- Inject slowly down the glass wall — never inject directly onto the powder. HGH is fragile and will denature if the liquid hits the powder at force.
- Swirl very gently until fully dissolved. Do not vortex or shake.
- Label with date and refrigerate immediately at 2–8°C. Use within 30 days.
Common research frameworks
GH is dosed in International Units. Research protocols vary widely depending on the goal. Subcutaneous injection is the standard administration route in most research contexts. Protocol data below reflects ranges found in published literature and research community usage.
| Protocol | Daily dose | Frequency | Notes |
|---|---|---|---|
| Anti-aging / longevity | 1–2 IU | Daily or 5 days on / 2 off | Lower end commonly used in age-related decline research. |
| Body composition | 2–4 IU | Daily | Higher doses studied in body composition and anabolic research. |
| Cycle length | 3–6 months | N/A | Typical cycle length in published research protocols. |
All dosing figures derived from research literature. Not clinical recommendations. Individual sensitivity to GH varies considerably.
Storage requirements
Lyophilized (dry)
Lyophilized (dry)
Reconstituted
Reconstituted (frozen)
What you’ll need
| Item | Spec | Notes | Source |
|---|---|---|---|
| Bacteriostatic water | 10mL multi-dose vial | Required for multi-dose reconstitution. Do not use saline. | ManaWell → |
| Insulin syringes | 28–31 gauge, 0.5mL or 1mL | Standard for subcutaneous GH administration. | Amazon → |
| Alcohol swabs | 70% isopropyl | For swabbing vial tops before each draw. | Amazon → |
| Sharps container | 1-quart, FDA-approved | For proper needle disposal. | Amazon → |
HGH 191AA suppliers
All content on PeptideRef.co is for informational and research purposes only. Nothing on this page constitutes medical advice. HGH 191AA is intended for laboratory research use only and is not approved for human consumption outside of pharmaceutical prescription contexts. PeptideRef may earn affiliate commissions from qualifying purchases.