Side-by-Side Comparison · 2026

Beta-Endorphin vs Dynorphin A

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

Beta-Endorphin
Endogenous Opioid

Beta-endorphin is a 31-amino acid endogenous opioid peptide cleaved from pro-opiomelanocortin (POMC) in the pituitary gland and hypothalamus. It is the most potent endogenous opioid, with approximately 18-33x the analgesic potency of morphine....

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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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Key Parameters
Parameter Beta-Endorphin Dynorphin A
Category Endogenous Opioid Endogenous Opioid
Research Research Research
Half-Life 20-30 min (plasma) Short (minutes)
Typical Dose Not established for exogenous use 1-10 nmol (central, animal)
Frequency Research variable Variable
Route Subcutaneous, Intravenous Intrathecal, Intracerebroventricular (research)
FDA Status Not approved for therapeutic use Not approved

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Frequently Asked Questions
What is the difference between Beta-Endorphin and Dynorphin A?
Beta-Endorphin: Beta-endorphin is a 31-amino acid endogenous opioid peptide cleaved from pro-opiomelanocortin (POMC) in the pituitary gland and hypothalamus. It is the most potent endogenous opioid, with approximatel... 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...
Which has a longer half-life, Beta-Endorphin or Dynorphin A?
Beta-Endorphin half-life: 20-30 min (plasma). Dynorphin A half-life: Short (minutes).
Can you stack Beta-Endorphin and Dynorphin A?
Beta-Endorphin and Dynorphin A 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.