Side-by-Side Comparison · 2026

Angiotensin 1-9 vs Apelin-17

Angiotensin 1-9 vs Apelin-17 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Angiotensin 1-9
Cardiovascular Peptide

Angiotensin 1-9 (Ang 1-9) is a 9-amino acid peptide formed when ACE2 cleaves the C-terminal leucine from angiotensin I (Ang I, 10 AA). Discovered as part of the counter-regulatory renin-angiotensin system (RAS), Ang 1-9 opposes the hypertensive and tissue-damaging actions of angi...

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Apelin-17
Cardiovascular Peptide

Apelin-17 is a 17-amino acid C-terminal fragment of the prepro-apelin precursor that binds and activates the APJ receptor (now APLNR) with the highest potency of all naturally occurring apelin isoforms. While apelin-13 is the best-characterized isoform, apelin-17 shows greater re...

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Key Parameters
Parameter Angiotensin 1-9 Apelin-17
Category Cardiovascular Peptide Cardiovascular Peptide
Research Preclinical Research Preclinical / Phase I
Half-Life ~20-30 minutes ~3-5 minutes IV (longer than apelin-13)
Typical Dose 40-400 ng/kg/min IV infusion (animal) 30-100 nmol/kg/min (IV infusion, clinical)
Frequency Acute infusion protocols Acute infusion protocols
Route IV/SC (research) IV infusion (clinical studies); SC under investigation
FDA Status Research compound Investigational (Phase I/II)

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Frequently Asked Questions
What is the difference between Angiotensin 1-9 and Apelin-17?
Angiotensin 1-9: Angiotensin 1-9 (Ang 1-9) is a 9-amino acid peptide formed when ACE2 cleaves the C-terminal leucine from angiotensin I (Ang I, 10 AA). Discovered as part of the counter-regulatory renin-angiotensin sy... Apelin-17: Apelin-17 is a 17-amino acid C-terminal fragment of the prepro-apelin precursor that binds and activates the APJ receptor (now APLNR) with the highest potency of all naturally occurring apelin isoform...
Which has a longer half-life, Angiotensin 1-9 or Apelin-17?
Angiotensin 1-9 half-life: ~20-30 minutes. Apelin-17 half-life: ~3-5 minutes IV (longer than apelin-13).
Can you stack Angiotensin 1-9 and Apelin-17?
Angiotensin 1-9 and Apelin-17 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.