Peps
What is Orexin-A?
Orexin-A, also known as hypocretin-1, is a hypothalamic signaling peptide. The foundational paper identified orexin peptides and receptors and studied feeding responses in rats.
Biological role or research focus
Hypothalamic feeding and arousal research.
The featured discovery paper does not establish treatment of insomnia, narcolepsy, or human performance enhancement.
Role reference: Orexins and orexin receptors: a family of hypothalamic neuropeptides and G protein-coupled receptors that regulate feeding behavior. · 1998 ↗
Names you may encounter
Hypocretin-1 · Orexin A
Search terms can include brands, combinations, or historical names. They are not automatic product equivalents.
- Class / identity
- Orexin / hypocretin neuropeptide
- Research focus
- Hypothalamic feeding and arousal research
- Featured evidence
- Animal discovery study
- Source check
- October 4, 2026
Biology & proposed mechanism
The discovery work linked orexin signaling to hypothalamic physiology. Later sleep applications need their own evidence rather than being assumed from the peptide’s name.
Research context & identity
This profile distinguishes an endogenous signaling peptide from medicines targeting its receptors. A receptor antagonist and orexin-A are different interventions.
What does the evidence show?
Selected published evidence, with the population, findings, and limits kept together. These original summaries draw on publication abstracts; they are not a systematic review.
Animal discovery study · 1998
Orexin discovery and feeding experiments
What did this publication test, and what did it find?
- Population / model
- Rat brain preparations and rats in feeding experiments.
- Study design
- Peptide and receptor identification, precursor-expression measurements, and central-administration experiments.
- Main finding
- Central orexin administration promoted feeding, and fasting increased precursor expression in the reported experiments.
- Limits & context
- The featured discovery paper does not establish treatment of insomnia, narcolepsy, or human performance enhancement.
Read the original paper for methods, adverse events, funding, and conflicts of interest. Publisher access may require a subscription.
Further reading · 4 additional publication links
Exact-name PubMed search checked 2026-10-04. These records have not been appraised. A name match can include related compounds, combinations, or other formulations; it does not establish safety or benefit.
Orexin-A alleviates astrocytic apoptosis and inflammation via inhibiting OX1R-mediated NF-κB and MAPK signaling pathways in cerebral ischemia/reperfusion injury. ↗
Biochimica et biophysica acta. Molecular basis of disease · 2021 Nov 1 · Journal Article, Research Support, Non-U.S. Gov't
Therapeutic effects of orexin-A in sepsis-associated encephalopathy in mice. ↗
Journal of neuroinflammation · 2024 May 17 · Journal Article
Read available full text ↗
Orexin-A and Circadian Disruption in Alzheimer's Disease: Implications for Amyloid-Beta Pathology. ↗
Molecular neurobiology · 2025 Dec 3 · Journal Article
Bidirectional gut-brain communication: A role for orexin-A. ↗
Neurochemistry international · 2020 Dec · Journal Article, Research Support, Non-U.S. Gov't, Review
New editorial updates
New source discoveries
Links appear automatically. Unreviewed discoveries are not verified medical findings.
Safety & precautions
Safety & what remains unknown
Animal central-administration findings cannot determine human exposure or systemic safety.
Evidence boundaries
The featured discovery paper does not establish treatment of insomnia, narcolepsy, or human performance enhancement.
This is not a complete list of contraindications, interactions, or adverse effects. Medicine labels apply to specific products and indications; research-use listings are not interchangeable with approved medicines.
What are people discussing?
No editorial transcript note has been reviewed for this profile yet. Below are the matching video records available for exploration; title and caption matches are not verified claims.
Watch the source discussions
3 matching video records · 0 with captions indexed.
Across the full library, 30 caption files are indexed from 20,199 inventoried videos. Most transcripts remain unreviewed. Select a thumbnail or timestamp to watch inside PepsRadar. Thumbnail images load from YouTube.
Biohackingturkey
Beynimizin Uyanıklık Anahtarı: Orexin A ↗
Title match · Captions not indexed
Biohackingturkey
Beynin Gizli Enerji Deposu: Orexin A Peptidi Nedir? ↗
Title match · Captions not indexed
Biohackingturkey
Orexin A: Beynimizin Hiç Uyumayan Gizli Gücü! ↗
Title match · Captions not indexed
Sources & supplier listings
Listings are grouped by the vendor’s stated identity. Blends and modified derivatives are labeled separately. Inclusion is not a quality assessment or an endorsement.
We have not added a supplier for this profile. Missing products and coded listings are not filled with guesses.
Catalog checked 2026-10-04. Seller listings retain their stated intended use. Shops covered: BioLongevity Labs, BioLongevity Supplements, American Peptides, PSPeptides. This is not a market-wide comparison. Affiliate participation does not determine evidence or editorial coverage.
Questions worth asking
- Is orexin-A equivalent to an orexin-receptor sleep medicine?
- What material, population, and route were actually studied?
- The featured discovery paper does not establish treatment of insomnia, narcolepsy, or human performance enhancement.
- What adverse effects, uncertainty, and conflicts of interest does the original source report?
Frequently asked questions
Is orexin-A equivalent to an orexin-receptor sleep medicine?
No. The peptide and a medicine blocking or stimulating a receptor are different interventions.
Does the publication verify a supplier’s product?
No. The tested material and a commercial listing need separate identity and batch checks. A research-use disclaimer does not establish clinical suitability.
References & editorial record
Source notes checked 2026-10-04. Original PepsRadar summaries. Not reviewed by a medical professional. Topic grouping is editorial navigation, not a treatment recommendation. Video notes specify which excerpts were reviewed; no full transcripts are published.