Selank research: what the published studies show

Inhibitory Currents in Rat Hippocampal Slices

A 2017 study applied Selank to hippocampal slices and recorded from pyramidal CA1 neurons, where the amplitude and discharge rate of spontaneous inhibitory postsynaptic currents both increased.^[1]

In some neurons that increase was preceded by a transient decrease in the same activity.^[1] Across the concentration range tested, Selank showed no significant dose-dependence.^[1]

Those two qualifications belong with the result rather than after it.^[1] An effect with no dose-response relationship is weaker evidence of a direct action than the same effect with one, and this is the only electrophysiological study on the page.^[1]

Anxiety Measures in Rats

A 2017 study tested Selank and diazepam in rats on the elevated plus maze, alone and combined, with and without unpredictable chronic mild stress.^[2]

Even in the absence of chronic stress, dosing a course of the test substances moved anxiety indicators toward deterioration, though the change after a course of Selank was less pronounced.^[2] Selank given alone was the most effective at reducing that raised anxiety.^[2]

Under chronic stress, anxiety indicator values after simultaneous diazepam and Selank did not differ from those seen before stress exposure, and that combination was the most effective.^[2]

The deterioration finding is the part of this study a product page would leave out, and it applies to both compounds rather than to Selank alone.^[2]

Memory and BDNF Under Chronic Ethanol

A 2019 study gave outbred rats 10 percent ethanol as their only fluid for 30 weeks, with Selank at 0.3 milligrams per kilogram daily by intraperitoneal injection.^[3]

In the object recognition test, Selank produced a cognitive-stimulating effect in rats not exposed to ethanol, and prevented the memory and attention disturbances developing during alcohol withdrawal.^[3]In ex vivo experiments, Selank prevented an ethanol-induced increase in BDNF content in hippocampus and frontal cortex.^[3] The direction matters: the compound stopped a rise rather than causing one.^[3] The authors describe this as confirming involvement of a neurotrophin mechanism.^[3]

State of the Evidence

All three sources are rat studies and two share a journal.^[1] No human study of this compound was retrieved.^[3] No independent group has replicated any finding here.^[2]

The mechanism most often attached to this compound rests on one slice study reporting increased inhibitory currents, a biphasic response in some cells, and no dose-dependence.^[1] A page that states a GABAergic mechanism is resting it on that.^[2]

Reference 2 complicates the anxiety picture rather than confirming it.^[2] Dosing courses of either compound worsened anxiety indicators in unstressed animals, and the strongest claims in that paper are about a combination with a benzodiazepine.^[2]

The parent molecule is not this compound.^[3] Tuftsin is a four-residue fragment of immunoglobulin G with its own immunological literature, and this is that fragment with three more residues attached.^[1] No tuftsin finding appears on this page.^[3]