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Semax and Selank were both developed by the Institute of Molecular Genetics of the Russian Academy of Sciences and have extensive Russian research literature. Semax is a heptapeptide analogue of ACTH(4-7) studied for its BDNF-modulating properties, neuroprotective effects and cognitive enhancement in research models. Selank is a synthetic analogue of the endogenous immunomodulatory peptide tuftsin, studied for anxiolytic properties, memory modulation and immune system interactions. The key mechanistic difference is that Semax primarily acts through neurotrophic pathways (BDNF, NGF modulation) while Selank acts through GABAergic and serotonergic systems to produce anxiolytic effects. Research comparing both compounds suggests they may be complementary in research protocols examining multiple aspects of cognitive biology — Semax for neuroplasticity and neuroprotection, Selank for stress response and anxiety modulation. Both compounds have demonstrated stability concerns and are typically studied in intranasal delivery models.
