Expired B vitamins can be used to prevent mosquitoes. Mosquitoes are disgusted with the smell of vitamin B. When they smell the smell of vitamin B, they will hide, so they can apply expired vitamin B to their bodies or mosquito nets, or to the door handles of rooms to prevent mosquito bites.

Vitamin B, also known as vitamin B, is the general name of B vitamins. They usually come from the same food source, such as yeast. Vitamin B is an essential part of metabolism in the body, and each vitamin B participates in key metabolic reactions, usually in the form of coenzyme.