GLP-AXIS RESEARCH
Retatrutide
Tri-agonist research compound studied for GLP-1, GIP, and glucagon receptor activity in vitro.
$90/vial
RESEARCH CATEGORY
GLP-axis Research Compounds.
FOR IN VITRO RESEARCH USE ONLY · NOT FOR HUMAN CONSUMPTION · NOT EVALUATED BY FDA
Lyophilized peptide material referenced in literature on GLP-1, GIP, and glucagon receptor signaling pathways in cellular research models.
Understanding the GLP axis.
The GLP axis is the research shorthand for the incretin and glucagon receptor family, the cellular signaling system that published literature has studied most heavily in the context of metabolism and energy balance. Three receptors anchor it: GLP-1 (glucagon-like peptide-1), GIP (glucose-dependent insulinotropic polypeptide), and the glucagon receptor. Research peptides in this category are classified by how many of these receptors they engage, from single agonists through to triple agonists.
That receptor count is the single most useful way to read a GLP-axis compound. A single agonist binds one receptor, a dual agonist binds two, and a triple agonist binds all three. The compounds most referenced in current research literature map cleanly onto that ladder, which is why researchers comparing them tend to start with the receptor profile rather than the molecule name.
Compounds studied across the GLP axis
| Compound | Receptor profile | Studied for |
|---|---|---|
| Semaglutide | Single (GLP-1) | GLP-1 receptor signaling |
| Tirzepatide | Dual (GLP-1 + GIP) | Combined incretin signaling |
| Retatrutide (GLP-3) | Triple (GLP-1 + GIP + glucagon) | Full tri-receptor incretin and glucagon signaling |
Receptor profiles reflect how each compound is characterized in published research literature. Listed for in vitro research context only.
Retatrutide, the triple agonist
Retatrutide, which NLL lists as GLP-3, is the compound at the top of the ladder. It is referenced in literature for engaging the GLP-1, GIP, and glucagon receptors at once, the broadest receptor profile of the GLP-axis compounds currently studied. NLL supplies it as a lyophilized research compound at 99.6 percent average HPLC purity, Finnrick tested, with a certificate of analysis tied to the lot number on every vial.
GLP-axis research, common questions
What is the GLP axis in peptide research?
The GLP axis refers to the incretin signaling system, primarily the GLP-1 receptor, alongside the GIP and glucagon receptors. In published literature these receptors are studied in cellular and animal models for their role in metabolic and energy-balance pathways. Research compounds in this category are characterized by which receptors they bind, from single agonists to triple agonists.
How is retatrutide different from semaglutide and tirzepatide?
Retatrutide is a triple agonist referenced for GLP-1, GIP, and glucagon receptor activity at once. Semaglutide is studied as a single GLP-1 agonist, and tirzepatide as a dual GLP-1 and GIP agonist. The distinction researchers draw is how many incretin and glucagon receptor pathways each compound engages.
Are these GLP research peptides third-party tested?
Yes. Every GLP-axis compound is independently HPLC tested by Finnrick before it ships, at 99 percent or higher average purity. The lot number on each vial maps to that batch's own COA. If an independent test does not match the published COA for that lot, NLL refunds the order in full and you keep the vial.
Are these compounds for human use?
No. Every compound here is intended for in vitro laboratory and research use only. It is not for human consumption, is not a drug or supplement, and these statements have not been evaluated by the FDA. The products are not intended to diagnose, treat, cure, or prevent any condition.
Where can I buy GLP-axis research peptides in the US?
Next Level Labs ships across the continental United States. Most orders ship within 1 to 2 business days via UPS Ground in discreet, unbranded packaging, flat 10 dollar shipping and free over 200 dollars. Payment is by Venmo Business or Zelle, and every order is backed by a COA-match guarantee.
For in vitro research use only. Not for human consumption. Not evaluated by the FDA. Not intended to diagnose, treat, cure, or prevent any condition. US shipping only.