HGH 191aa: The Full-Length Recombinant Hormone
Research compounds for laboratory use only · not medical advice
The 191-amino-acid somatropin, why it's measured in IU not mg, and how the 10 IU vial reconstitutes for research.
HGH 191aa is the exception that proves the rule in this catalog: it’s not a fragment, not a secretagogue, not a peptide analog — it’s the full-length hormone, all 191 amino acids, made recombinantly.
What “191aa” means
Human growth hormone is a 191-amino-acid single-chain protein. HGH 191aa is the complete recombinant somatropin with that full sequence — verified by SDS-PAGE for size and HPLC for purity, per the product specification. It’s the reference material itself, not a piece of it.
IU vs mg: the unit trap
This is where protocols stumble. Most lyophilized products here are weighed in milligrams; HGH is bioassayed in international units. A 10 IU vial is not 10 mg — they’re different measurement systems.
The reconstitution calculator handles it: the HGH preset switches the math to IU arithmetic, so concentration reads in IU/mL and target doses are entered in IU. For the secretagogue comparison, see Ipamorelin vs HGH 191aa.
Reconstitution
- 10 IU + 2 mL bacteriostatic water → 5 IU/mL
- Each 0.1 mL holds 0.5 IU
- A 0.5 IU dose = 10 units on a U-100 syringe
Storage is −20 °C lyophilized; reconstituted, refrigerate per the COA.
Research context
As the full-length reference standard, HGH 191aa is used in cell proliferation and receptor signaling studies. See HGH 191aa for the full specification sheet.
For laboratory research use only. Not medical advice.
Last updated September 9, 2026
FAQ
Frequently asked questions
What does 191aa mean?
It refers to the full 191-amino-acid sequence of human growth hormone — the complete recombinant somatropin, verified by SDS-PAGE and HPLC.
Why is HGH measured in IU while peptides use mg?
HGH is bioassayed in international units; synthetic peptides are weighed in milligrams. The reconstitution calculator switches unit systems automatically for the HGH preset.
How do I reconstitute the 10 IU vial?
10 IU + 2 mL water gives 5 IU/mL. Each 0.1 mL holds 0.5 IU; a 0.5 IU dose is 10 units on a U-100 syringe.
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