Endomorphin-1
Also known as: EM-1, endomorphin 1
Endogenous mu-opioid receptor agonist with high selectivity; studied for pain pathways with reduced side-effect profiles versus classical opioids.
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Overview
Chemical compound
Endomorphin-1 (EM-1) (amino acid sequence Tyr-Pro-Trp-Phe-NH2) is an endogenous opioid peptide and one of the two endomorphins. It is a high affinity, highly selective agonist of the μ-opioid receptor, and along with endomorphin-2 (EM-2), has been proposed to be the actual endogenous ligand of the μ-receptor. EM-1 produces analgesia in animals and is equipotent with morphine in this regard. The gene encoding for EM-1 has not yet been identified, and it has been suggested that endomorphins could be synthesized by an enzymatic, non-ribosomal mechanism.
Mechanism of Action
Endomorphin-1 (EM-1) (amino acid sequence Tyr-Pro-Trp-Phe-NH2) is an endogenous opioid peptide and one of the two endomorphins. It is a high affinity, highly selective agonist of the μ-opioid receptor, and along with endomorphin-2 (EM-2), has been proposed to be the actual endogenous ligand of the μ-receptor. EM-1 produces analgesia in animals and is equipotent with morphine in this regard. The gene encoding for EM-1 has not yet been identified, and it has been suggested that endomorphins could be synthesized by an enzymatic, non-ribosomal mechanism.
What Researchers Are Saying
Community Reports - Not Medical Advice
The following is aggregated from public forums, Reddit, and research communities. These are anecdotal reports from researchers only - not verified clinical data and not a recommendation of any kind.
Endomorphin-1 (also known as EM-1, endomorphin 1) is studied within the cognitive function and neuroprotection research community. Endogenous mu-opioid receptor agonist with high selectivity; studied for pain pathways with reduced side-effect profiles versus classical opioids.
Last updated October 28, 2026
Research status: emerging. Endomorphin-1 appears across cognitive function and neuroprotection research forums and academic literature. Researchers note this compound falls in the cognitive category.
Last updated October 28, 2026
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