Selank gives it the capacity to increase the secretion of serotonin. This neurotransmitter is noted for its ties to mood regulation, and it has also been noted to contain links to sleep and appetite regulation. The presence of the peptide and its ability to cause an uptick in the release of serotonin means that the animal test subject can experience a more efficient means of homeostasis in terms of mood, hunger, and sleep. In addition to inducing a greater metabolic rate of serotonin, it has also been determined that Selank has the capacity to modulate the expression of interleukin 6, a white blood cell-secretion that can act as both a pro-inflammatory cytokine and an anti-inflammatory myokine. This secretion plays a key role in stimulating the immune response during infection and after trauma, particularly during instances of tissue damage leading to inflammation.