Product effectiveness for Cinnamomum verum essential oil.

A, C. verum oil 1%; B, C. verum oil 2.5%; C, C. verum oil 5%; D, C. verum oil 10%; E, C. verum oil 20%; F, Negative control; G, Positive control. Bars with same superscript symbols differ non-significantly from each other (P > 0.05).