Side-by-Side Comparison · 2026

Neuropeptide FF vs Relaxin-3

Neuropeptide FF vs Relaxin-3 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Neuropeptide FF
Neuropeptide

Neuropeptide FF (NPFF) is an endogenous octapeptide first isolated from bovine brain in 1985 and recognized as a key endogenous anti-opioid system component. NPFF is produced in the hypothalamus, brain stem, and spinal cord and acts on NPFF1 and NPFF2 receptors (GPCRs) to oppose ...

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Relaxin-3
Neuropeptide

Relaxin-3 (also called INSL7) is the most ancient member of the insulin/relaxin superfamily and is expressed predominantly in the nucleus incertus (NI) of the brainstem, a structure implicated in stress, arousal, and hippocampal theta rhythm generation. Unlike relaxin-1 and relax...

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Key Parameters
Parameter Neuropeptide FF Relaxin-3
Category Neuropeptide Neuropeptide
Research Research Preclinical Research
Half-Life Short (minutes) ~30-60 minutes (estimated)
Typical Dose 0.1-10 nmol (central, animal) 100-500 pmol ICV; 1-3 nmol/kg SC
Frequency Variable Single or twice daily (preclinical)
Route Intrathecal, Intracerebroventricular (research) ICV, SC (preclinical)
FDA Status Not approved Research compound

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Frequently Asked Questions
What is the difference between Neuropeptide FF and Relaxin-3?
Neuropeptide FF: Neuropeptide FF (NPFF) is an endogenous octapeptide first isolated from bovine brain in 1985 and recognized as a key endogenous anti-opioid system component. NPFF is produced in the hypothalamus, brai... Relaxin-3: Relaxin-3 (also called INSL7) is the most ancient member of the insulin/relaxin superfamily and is expressed predominantly in the nucleus incertus (NI) of the brainstem, a structure implicated in stre...
Which has a longer half-life, Neuropeptide FF or Relaxin-3?
Neuropeptide FF half-life: Short (minutes). Relaxin-3 half-life: ~30-60 minutes (estimated).
Can you stack Neuropeptide FF and Relaxin-3?
Neuropeptide FF and Relaxin-3 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.