Selank is a synthetic heptapeptide, a tuftsin analog built on the immune-active fragment tuftsin with a C-terminal tripeptide extension added to slow enzymatic breakdown. It belongs to the regulatory neuropeptide class.

In the published preclinical literature, Selank has been characterised at the molecular and cellular level as a modulator of central neurotransmission, with reported work on the GABAergic system in rodent and ex-vivo neural models, assayed by gene-expression and electrophysiological methods. It is supplied as a research compound and is not intended for human or veterinary use.