Side-by-Side Comparison · 2026

Dynorphin A vs Enkephalins

Dynorphin A vs Enkephalins — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Dynorphin A
Endogenous Opioid

Dynorphin A is a 17-amino acid endogenous opioid peptide cleaved from prodynorphin, the precursor protein also giving rise to dynorphin B and alpha/beta-neoendorphin. Dynorphin A is the primary endogenous agonist of kappa-opioid receptors (KOR) and one of the most potent endogeno...

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Enkephalins
Endogenous Opioid

Enkephalins are the smallest endogenous opioid peptides, consisting of just five amino acids. They exist as two forms: Leu-enkephalin (YGGFL) and Met-enkephalin (YGGFM), differing only in the C-terminal residue....

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Key Parameters
Parameter Dynorphin A Enkephalins
Category Endogenous Opioid Endogenous Opioid
Research Research Research
Half-Life Short (minutes) < 1 min (plasma, rapidly degraded by enkephalinases)
Typical Dose 1-10 nmol (central, animal) Research variable
Frequency Variable Variable
Route Intrathecal, Intracerebroventricular (research) Intrathecal, Intravenous (research); oral Met-enkephalin (LDN adjacent)
FDA Status Not approved Not approved

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Frequently Asked Questions
What is the difference between Dynorphin A and Enkephalins?
Dynorphin A: Dynorphin A is a 17-amino acid endogenous opioid peptide cleaved from prodynorphin, the precursor protein also giving rise to dynorphin B and alpha/beta-neoendorphin. Dynorphin A is the primary endoge... Enkephalins: Enkephalins are the smallest endogenous opioid peptides, consisting of just five amino acids. They exist as two forms: Leu-enkephalin (YGGFL) and Met-enkephalin (YGGFM), differing only in the C-termin...
Which has a longer half-life, Dynorphin A or Enkephalins?
Dynorphin A half-life: Short (minutes). Enkephalins half-life: < 1 min (plasma, rapidly degraded by enkephalinases).
Can you stack Dynorphin A and Enkephalins?
Dynorphin A and Enkephalins 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.