Currently studies using kanna have used the brand name Zembrin at doses of 8 to25 mg prior to cognitive testing. This brand name is a 2:1 concentration of kanna based on dry weight and is considered equivalent to 16 to 50 mg of the dry weight of the plant itself.

Kanna has been studied as oral administration (capsules) but traditionally the leaves have been chewed and saliva swallowed for similar effects.

Optimal frequency of dosing (i.e., either only on testing days or daily) is currently not known.