Selank, for its part, is built from tuftsin, an immune-signaling tetrapeptide, and its one published comparative trial pitted it against the benzodiazepine-class anxiety drug medazepam in 62 patients with generalized anxiety and neurasthenia, reporting comparable anxiety relief without the sedation, plus a measurable rise in the bodys own enkephalins (Zozulya et al., 2008, randomized comparison)
Common experiences include no noticeable side effects at standard doses (250-500mcg for injectable, 500mcg for oral)
Biochem Biophys Acta 1832:773779 Virmani MA, Biselli R, Spadoni A, Rossi S, Corsico N, Calvani M, Fattorossi A, De Simone C, Arrigoni-Martelli E (1995) Protective actions of l-carnitine and acetyl-l-carnitine on the neurotoxicity evoked by mitochondrial uncoupling or inhibitors
doi: 10.1007/s11926-011-0217-3