What is the difference between Colostrinin and Selank?

Colostrinin: Proline-rich polypeptide complex isolated from ovine (sheep) colostrum. Originally researched as an Alzheimer's disease modulator, colostrinin has shown ability to stabilize cognitive function and reduce progression in mild-to-moderate Alzheimer's patients in double-blind trials. Also studied for immune modulation and anti-aging properties via cytokine balance normalization. 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 Colostrinin and Selank together?

There is no specific, well-documented interaction rule for combining Colostrinin 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, Colostrinin or Selank?

Colostrinin 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

Colostrinin 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.

Colostrinin

Research-stage

Proline-rich polypeptide complex isolated from ovine (sheep) colostrum. Originally researched as an Alzheimer's disease modulator, colostrinin has shown ability to stabilize cognitive function and reduce progression in mild-to-moderate Alzheimer's patients in double-blind trials. Also studied for immune modulation and anti-aging properties via cytokine balance normalization.

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

	Colostrinin	Selank
Category	Nootropic & Cognitive	Nootropic & Cognitive
Also known as	PRP (proline-rich polypeptide), ND, colostrum neuropeptide, CLN, ovine proline-rich polypeptide	TP-7, Tuftsin analog
Evidence	Research-stage	Research-stage
Dosing range	100mcg–400mcg mcg, sublingual, on a 3 days on / 3 days off cycle	250mcg–1000mcg mcg, 1–2x daily
Administration	Sublingual tablet/drop	Intranasal (most common — direct CNS delivery), Subcutaneous injection
Key side effects	Generally well-tolerated, Mild GI discomfort, Rare hypersensitivity (relevant for dairy protein sensitivity), Mild fatigue (initial days)	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: Colostrinin — Sublingual tablet/drop; Selank — Intranasal (most common — direct CNS delivery), Subcutaneous injection.
Frequency: Colostrinin is typically sublingual, on a 3 days on / 3 days off cycle; Selank is 1–2x daily.
Research depth: this profile cites 2 sources for Colostrinin vs 1 for Selank.

How each works

Colostrinin

Colostrinin modulates dendritic cell maturation and shifts cytokine balance toward anti-inflammatory patterns (reduced IL-6, TNF-α; increased IL-10). In neurological models, it reduces amyloid-β aggregation, decreases oxidative stress, and upregulates NGF while modulating the HPA axis stress response. A Polish double-blind trial showed statistically significant cognitive stabilization in mild-to-moderate AD patients over 15 weeks.

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 Colostrinin 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.