Semax and Selank are two synthetic peptides developed in Russia that are frequently studied side by side in neuroscience research. Although they are often grouped together, they derive from different parent molecules and are investigated for distinct proposed mechanisms.
Semax at a Glance
Semax is a synthetic analog of the ACTH(4-10) fragment of adrenocorticotropic hormone. It is studied in relation to the BDNF system, the melanocortin pathway, and neuroprotection in laboratory models. See our Semax cognitive research primer.
Selank at a Glance
Selank is a synthetic analog of tuftsin. It is investigated in anxiety-related, cognitive, and neuroimmune research, including its proposed relationship to GABAergic and serotonergic signaling.
Where the Research Overlaps and Differs
Both peptides are short, stabilized analogs studied for BDNF-related and behavioral endpoints in preclinical models, which is why they are often examined together. The key research distinction is their origin and proposed mechanism: Semax through ACTH/melanocortin-related pathways, and Selank through tuftsin/neuroimmune-related pathways.
Choosing for a Research Model
Selection depends entirely on the research question and model design. Researchers commonly reference the published literature for each compound when designing comparative studies.
Frequently Asked Questions
Are Semax and Selank the same?
No. They share a Russian research origin and are often compared, but they are different molecules with different proposed mechanisms.
Can they be studied together?
They are frequently examined in comparative behavioral research models. Study design is determined by the researcher and the model.
Where can I find both for research?
Greatest Peptides supplies both Semax and Selank at 99%+ purity with batch-specific COAs, for laboratory research use only.
All compounds referenced here are sold strictly for laboratory and research use only. They are not dietary supplements, drugs, or therapeutic products, and nothing here describes effects in humans.