What is the difference between Noopept and Selank?

Noopept: Dipeptide-derived nootropic developed in Russia and used across Eastern Europe as a cognitive enhancer and neuroprotective agent. Structurally related to piracetam but estimated to be approximately 1000× more potent by weight. Rapidly crosses the blood-brain barrier and is hydrolyzed to the endogenous neuropeptide cycloprolylglycine, which is proposed as its primary active metabolite. Selank: Selank is a synthetic heptapeptide derived from tuftsin, an endogenous immunomodulatory peptide. Developed in Russia by the Institute of Molecular Genetics, it has been studied extensively for anxiolytic, nootropic, and immunomodulatory effects. It is registered as a medication in Russia and Ukraine. Both are in the Nootropic & Cognitive category but differ in mechanism, dosing, and research evidence — see the full comparison.

Can you take Noopept and Selank together?

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

Which is better researched, Noopept or Selank?

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

Nootropic & Cognitive · Comparison

Noopept vs 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.

Noopept

Research-stage

Dipeptide-derived nootropic developed in Russia and used across Eastern Europe as a cognitive enhancer and neuroprotective agent. Structurally related to piracetam but estimated to be approximately 1000× more potent by weight. Rapidly crosses the blood-brain barrier and is hydrolyzed to the endogenous neuropeptide cycloprolylglycine, which is proposed as its primary active metabolite.

Full profile

Selank

Research-stage

Selank is a synthetic heptapeptide derived from tuftsin, an endogenous immunomodulatory peptide. Developed in Russia by the Institute of Molecular Genetics, it has been studied extensively for anxiolytic, nootropic, and immunomodulatory effects. It is registered as a medication in Russia and Ukraine.

Full profile

	Noopept	Selank
Category	Nootropic & Cognitive	Nootropic & Cognitive
Also known as	GVS-111, N-phenylacetyl-L-prolylglycine ethyl ester, omberacetam, N-Phenylacetyl-L-Prolylglycine Ethyl Ester	TP-7, Tuftsin analog
Evidence	Research-stage	Research-stage
Dosing range	5mg–20mg mg, 1–3x daily oral or sublingual (8–12 week cycles)	250mcg–1000mcg mcg, 1–2x daily
Administration	Oral (capsule/powder), Sublingual (dissolved under tongue), Intranasal	Intranasal (most common — direct CNS delivery), Subcutaneous injection
Key side effects	Headache (especially without choline supplementation), Irritability, Brain fog at high doses, Insomnia (if taken too late in day)	Mild sedation at high doses, Nasal irritation (intranasal route), Generally very well-tolerated, No reported dependence or withdrawal
Cited sources	2 references	1 reference

Key differences

Administration: Noopept — Oral (capsule/powder), Sublingual (dissolved under tongue), Intranasal; Selank — Intranasal (most common — direct CNS delivery), Subcutaneous injection.
Dosing units differ: Noopept is dosed in mg, Selank in mcg — they operate at different scales.
Frequency: Noopept is typically 1–3x daily oral or sublingual (8–12 week cycles); Selank is 1–2x daily.
Research depth: this profile cites 2 sources for Noopept vs 1 for Selank.

How each works

Noopept

Noopept (GVS-111) enhances AMPA-receptor function and increases expression of BDNF and NGF in the hippocampus and basal forebrain. Its active metabolite cycloprolylglycine acts as an endogenous neuropeptide with anxiolytic and cognition-enhancing properties. Russian clinical trials demonstrate cognitive improvement in subjects with cognitive impairment, with a better tolerability profile than piracetam at equipotent doses.

Selank

Selank modulates GABA-A receptors and influences BDNF expression, producing anxiolytic effects comparable to benzodiazepines without sedation or dependence. Russian clinical studies report improvements in generalized anxiety disorder, cognitive performance, and mood stability. It also appears to modulate T-helper cell ratios and interferon production.

Read the full Noopept profile Read the full 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.