Argireline has mechanism of action that significantly inhibited neurotransmitter release with a potency similar to that of BoNTA. Inhibition of neurotransmitter release was due to the interference of the hexapeptide with the formation and/or stability of SNARE complex. Notably, this peptide did not exhibit in vivo oral toxicity nor primary irritation at high doses. These findings demonstrate that Argireline is a anti-wrinkle peptide that emulates the action of currently used BoNTs.