Piper bettle

A study of leaf extract showed antibacterial, antioxidative, and anti-hemolytic activities. The bioactive molecule for antibacterial activity was presumed to be sterol, which was obtained in large quantities. The antioxidative and antihemolytic activities were attributed to the high concentration and combined activity of flavonoids and polyphenols.

Guava

 Aqueous extracts of leaves have shown antimicrobial activity against Shigella spp., Vibrio spp., S aureus, B-strep, E coli, P aeruginosa and B subtilis.

Lemon grass

Studies have shown antibacterial activity, comparable to penicillin. (2) Various studies has shown activity against C albicans, C pseudotropicalis, Mycrosporum gypseum and A niger. (3) Study evaluated the antibacterial properties of alcohol and water extracts. The alcohol extract was generally more effective than the water extract. The presence of alkaloids and phenols were assumed responsible for the antibacterial activity of the extracts.