Side-by-Side Comparison · 2026

Secretin vs Xenin-25

Secretin vs Xenin-25 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Secretin
GI Peptide

Secretin is a 27-amino acid peptide and the first hormone ever discovered (Bayliss and Starling, 1902), historically marking the birth of endocrinology as a scientific discipline. Produced by S-cells in the duodenal mucosa in response to luminal acid, secretin stimulates bicarbon...

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Xenin-25
GI Peptide

Xenin-25 is a 25-amino acid peptide co-secreted with GIP (glucose-dependent insulinotropic polypeptide) from intestinal K-cells in response to fat and carbohydrate ingestion. Xenin is structurally and functionally related to the neurotensin peptide family....

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Key Parameters
Parameter Secretin Xenin-25
Category GI Peptide GI Peptide
Research Clinical Research
Half-Life 45 min (plasma) 3-4 min (plasma)
Typical Dose 0.2-0.4 mcg/kg (diagnostic) 4-12 pmol/kg/min (IV research infusion)
Frequency Single diagnostic dose or short protocol Post-prandial or research infusion
Route Intravenous Intravenous, Subcutaneous
FDA Status Approved (diagnostic use) Not approved

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Frequently Asked Questions
What is the difference between Secretin and Xenin-25?
Secretin: Secretin is a 27-amino acid peptide and the first hormone ever discovered (Bayliss and Starling, 1902), historically marking the birth of endocrinology as a scientific discipline. Produced by S-cells ... Xenin-25: Xenin-25 is a 25-amino acid peptide co-secreted with GIP (glucose-dependent insulinotropic polypeptide) from intestinal K-cells in response to fat and carbohydrate ingestion. Xenin is structurally and...
Which has a longer half-life, Secretin or Xenin-25?
Secretin half-life: 45 min (plasma). Xenin-25 half-life: 3-4 min (plasma).
Can you stack Secretin and Xenin-25?
Secretin and Xenin-25 are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.