Side-by-Side Comparison · 2026

Angiotensin II vs Big Endothelin-1

Angiotensin II vs Big Endothelin-1 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Angiotensin II
Vasoactive Peptide

Angiotensin II is the principal effector peptide of the renin-angiotensin-aldosterone system (RAAS), a master regulator of blood pressure, fluid balance, and cardiovascular function. Generated by sequential cleavage of angiotensinogen by renin (producing Ang I) then by angiotensi...

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Big Endothelin-1
Vasoactive Peptide

Big endothelin-1 (big ET-1) is a 38-amino acid peptide that is the direct precursor to the potent vasoconstrictor endothelin-1 (ET-1). It is produced by vascular endothelial cells from preproendothelin-1 and cleaved to the active 21-amino acid ET-1 by endothelin-converting enzyme...

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Key Parameters
Parameter Angiotensin II Big Endothelin-1
Category Vasoactive Peptide Vasoactive Peptide
Research Clinical Preclinical/Biomarker
Half-Life 30 seconds - 2 minutes (plasma) Longer than ET-1 (~plasma half-life 3-5 min ET-1)
Typical Dose 20-40 ng/kg/min (vasopressor) Research only
Frequency Continuous infusion in clinical use N/A
Route Intravenous (continuous infusion) Endogenous; IV (research)
FDA Status Approved (Giapreza, vasodilatory shock) No approval

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Frequently Asked Questions
What is the difference between Angiotensin II and Big Endothelin-1?
Angiotensin II: Angiotensin II is the principal effector peptide of the renin-angiotensin-aldosterone system (RAAS), a master regulator of blood pressure, fluid balance, and cardiovascular function. Generated by sequ... Big Endothelin-1: Big endothelin-1 (big ET-1) is a 38-amino acid peptide that is the direct precursor to the potent vasoconstrictor endothelin-1 (ET-1). It is produced by vascular endothelial cells from preproendotheli...
Which has a longer half-life, Angiotensin II or Big Endothelin-1?
Angiotensin II half-life: 30 seconds - 2 minutes (plasma). Big Endothelin-1 half-life: Longer than ET-1 (~plasma half-life 3-5 min ET-1).
Can you stack Angiotensin II and Big Endothelin-1?
Angiotensin II and Big Endothelin-1 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.