If you think there were more mosquitoes this year than usual, you're not wrong. Spring and summer in 2023 saw record temperatures across the globe, including in southern Ontario. Combined with a wetter-than-average season, that meant mosquitoes had more habitats in which they could reproduce and grow.
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More recently, a 2005 study showed there was no evidence it influenced the attraction of mosquitoes to human skin-derived chemicals from volunteers taking vitamin B supplements. There is simply no evidence taking vitamin B will offer any significant protection from mosquito bites.
Many dermatologists now recommend that the skin can be made much less attractive to biting insects by taking Vitamin B supplements whilst at risk. So, we recommend that Vitamin B complex, 2 tablets twice a day, or Vitamin B-1, 100 mg daily, is a good way of helping to reduce the risk of being bitten.