What is the difference between Cortexin and N-Acetyl Selank?

Cortexin: Polypeptide nootropic extracted from the cortex of cattle or pigs, containing a mixture of low-molecular-weight neuropeptides (≤10 kDa). Registered pharmaceutical in Russia and widely used in Eastern European clinical medicine for stroke recovery, traumatic brain injury, cognitive decline, epilepsy, and cerebrovascular disease. Decades of Russian clinical literature support neuroprotective and neurorestorative effects. N-Acetyl Selank: Acetylated variant of Selank with enhanced stability and bioavailability. The N-acetyl modification protects the peptide from rapid enzymatic degradation, extending its active half-life relative to standard Selank. Provides anxiolytic, nootropic, and immunomodulatory effects comparable to or exceeding standard Selank with potentially greater duration from each dose. Both are in the Nootropic & Cognitive category but differ in mechanism, dosing, and research evidence — see the full comparison.

Can you take Cortexin and N-Acetyl Selank together?

There is no specific, well-documented interaction rule for combining Cortexin and N-Acetyl Selank in the aggregated research reviewed. Combining peptides should only be considered under professional supervision. This is not medical advice.

Which is better researched, Cortexin or N-Acetyl Selank?

Cortexin is currently research-stage and N-Acetyl Selank is research-stage. "Better researched" depends on your research goal — review each profile's cited sources.

Nootropic & Cognitive · Comparison

Cortexin vs N-Acetyl Selank

A neutral, side-by-side comparison of two nootropic & cognitive peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.

Cortexin

Research-stage

Polypeptide nootropic extracted from the cortex of cattle or pigs, containing a mixture of low-molecular-weight neuropeptides (≤10 kDa). Registered pharmaceutical in Russia and widely used in Eastern European clinical medicine for stroke recovery, traumatic brain injury, cognitive decline, epilepsy, and cerebrovascular disease. Decades of Russian clinical literature support neuroprotective and neurorestorative effects.

Full profile

N-Acetyl Selank

Research-stage

Acetylated variant of Selank with enhanced stability and bioavailability. The N-acetyl modification protects the peptide from rapid enzymatic degradation, extending its active half-life relative to standard Selank. Provides anxiolytic, nootropic, and immunomodulatory effects comparable to or exceeding standard Selank with potentially greater duration from each dose.

Full profile

	Cortexin	N-Acetyl Selank
Category	Nootropic & Cognitive	Nootropic & Cognitive
Also known as	cortexin polypeptide, cortexin-10, neuropeptide bioregulator, cortexin-5	Selank-A, N-Ac-Selank, acetylated selank, N-acetyl selank
Evidence	Research-stage	Research-stage
Dosing range	5mg–20mg mg, daily IM injection for 10-day courses	100mcg–500mcg mcg, 1–2x daily intranasal
Administration	Intramuscular injection	Intranasal spray, Subcutaneous injection
Key side effects	Injection site pain, Rare allergic reaction, Headache (transient), Mild dizziness	Mild sedation (acute), Fatigue, Headache (rare), Nasal irritation (intranasal route)
Cited sources	2 references	2 references

Key differences

Administration: Cortexin — Intramuscular injection; N-Acetyl Selank — Intranasal spray, Subcutaneous injection.
Dosing units differ: Cortexin is dosed in mg, N-Acetyl Selank in mcg — they operate at different scales.
Frequency: Cortexin is typically daily IM injection for 10-day courses; N-Acetyl Selank is 1–2x daily intranasal.

How each works

Cortexin

Cortexin's multi-component neuropeptide mixture modulates neurotransmitter systems, improves cerebral blood flow, enhances neuroplasticity (BDNF upregulation), and exhibits antioxidant and anti-apoptotic activity in neuronal tissue. Russian stroke rehabilitation trials show improved neurological deficit scores and functional recovery with 10-day cortexin courses compared to standard care alone. The mechanism involves multiple parallel neuropeptide signaling pathways.

N-Acetyl Selank

N-Acetyl Selank shares Selank's core mechanism — BDNF/NGF upregulation, enkephalinase inhibition, and GABA-A receptor complex modulation — with improved metabolic stability from the N-terminal acetyl group. The acetyl modification protects against aminopeptidase N and angiotensin-converting enzyme cleavage, extending the peptide's active residence time in neural tissue after intranasal administration.

Read the full Cortexin profile Read the full N-Acetyl Selank profile

This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.