Orexin A
Also known as: hypocretin-1, hypocretin 1, orexin-A, HCRT1
Orexin A, also known as hypocretin-1, is a 33 amino acid neuropeptide made by a small cluster of neurons in the hypothalamus. It is studied in sleep and energy research for its role in maintaining wakefulness and coordinating appetite and metabolic balance.
Quick Reference
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Overview
Stimulating neuropeptide
Orexin-A, also known as hypocretin-1, is a naturally occurring neuropeptide and orexin isoform. The orexinergic nucleus in the lateral hypothalamus is the primary orexin projection system in the brain.
Mechanism of Action
Orexin A binds the orexin receptors OX1R and OX2R with high affinity. Through these receptors it supports wakefulness and stimulates food intake in research models, and it can modulate pituitary luteinizing hormone secretion depending on ovarian steroid status.
Research History
Orexin A is cataloged under two naming traditions, orexin and hypocretin, both of which remain in use. Its precursor protein is cut to release the active peptide, and research has linked it to food intake, sleep and wakefulness, energy metabolism, autonomic function, and hormonal balance.
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.
Orexin A (also known as hypocretin-1, hypocretin 1) is studied within the cognitive function and neuroprotection research community. Hypothalamic neuropeptide studied for wakefulness promotion and narcolepsy treatment.
Last updated October 28, 2026
Research status: active. Orexin A 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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