“Pretreatment of porcine skin with ethanol (vehicle), polyethylene glycol 600, Span 20, oleic acid , R-(+)-limonene, alpha-bisabolol and 1,8-cineole (at 5% in ethanol, w/w) produced in all cases an increase in the flux of sumatriptan.”
“Span 20, oleic acid , and polyethylene glycol 600 have shown a moderate enhancing activity on transdermal flux of sumatriptan.”