- The University of Florida IFAS Extension found no scientific evidence to support the use of vitamin B supplements, including B12, as an effective mosquito repellent. The University of Wisconsin's Integrated Mosquito Management program reached the same conclusion.
- Mosquitoes are enticed to bite due to a complex interaction of visual and chemical cues. The University of Florida IFAS Extension admits that some foods or vitamins may increase or decrease a given individual's attractiveness to mosquitoes, but the reasons why they may affect one person in one way and another in the opposite way is not understood. However, vitamin B supplements do not provide the kind of consistent results necessary to earn an endorsement as an effective mosquito repellent.
- Vitamin B does seem to help ward off another biting bug related to the mosquito: the flea. Vet Info says dog owners have experienced some success in warding off fleas by giving their dogs vitamin B and garlic supplements.
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