Two peptides, two very different origins

Semax and Selank are mentioned together so often that they are easy to confuse. They were both developed by Russian research institutes, both are studied primarily as nasal sprays, and both act on the brain — and that is roughly where the similarity ends. Their chemistry, their parent molecules, and the questions researchers ask about them are entirely distinct.

Semax: built from a hormone fragment

Semax is a synthetic heptapeptide based on a fragment of ACTH, the adrenocorticotropic hormone — specifically the ACTH(4–7) sequence, extended with a Pro-Gly-Pro tail that makes it far more stable than the natural fragment. In the published literature, Semax is studied for its interactions with melanocortin receptors and with the expression of neurotrophic factors such as BDNF in animal models. That body of work — much of it in models of cerebral ischemia and cognitive performance under stress conditions — is why Semax anchors the nootropic end of the research catalog.

Selank: built from an immune peptide

Selank starts somewhere unexpected: tuftsin, a four-amino-acid peptide from the immune system that helps coordinate phagocyte activity. Selank is a stabilized tuftsin analog, and the research around it centers on anxiety and stress-response models, including its reported interaction with GABAergic signaling and with the breakdown of enkephalins, the brain's own calming peptides. Where Semax research leans toward alertness and cognition models, Selank research leans toward calm-under-pressure models.

Why the nasal format matters here

Both compounds are studied intranasally for a structural reason: the nasal cavity offers a pathway toward the central nervous system that partially sidesteps the blood-brain barrier. When the research question is about nose-to-brain transport, the spray is not a convenience — it is the experiment. Our sprays are metered, so each actuation delivers a consistent volume. We stock Semax and Selank individually, as the classic Selank / Semax blend, and in the stronger 10+10 combination for designs that call for both compounds at higher content.

The honest frame

Nearly all of the Semax and Selank literature is preclinical or early-stage, and a large share of it was published in Russian-language journals, which makes independent Western replication limited. Researchers who work with these compounds know that going in. What we supply is the material side of the equation: correctly identified, lab-grade peptide in the formats the literature uses, sold strictly for research.

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