Side-by-Side Comparison · 2026

Beta-Endorphin vs Enkephalins

Beta-Endorphin vs Enkephalins — 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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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 Beta-Endorphin Enkephalins
Category Endogenous Opioid Endogenous Opioid
Research Research Research
Half-Life 20-30 min (plasma) < 1 min (plasma, rapidly degraded by enkephalinases)
Typical Dose Not established for exogenous use Research variable
Frequency Research variable Variable
Route Subcutaneous, Intravenous Intrathecal, Intravenous (research); oral Met-enkephalin (LDN adjacent)
FDA Status Not approved for therapeutic use Not approved

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Frequently Asked Questions
What is the difference between Beta-Endorphin and Enkephalins?
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... 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, Beta-Endorphin or Enkephalins?
Beta-Endorphin half-life: 20-30 min (plasma). Enkephalins half-life: < 1 min (plasma, rapidly degraded by enkephalinases).
Can you stack Beta-Endorphin and Enkephalins?
Beta-Endorphin 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.