Vitamin B1 does NOT work for mosquito bites.
Studies exploring vitamin B as a mosquito deterrent conclude that it is ineffective.
More Info: A study published in the Transactions of the St. John’s Hospital Dermatological Society tested vitamin B1 as a mosquito deterrent on 18 adult volunteers. The subjects were divided into a placebo group and a group ingesting 200 mg of thiamine chloride (vitamin B1) for three days. The subjects were then locked in a room with 100 female mosquitoes. The study concluded that there was no clinical evidence that the vitamin B1 was an effective deterrent.
Another study published in the Journal of the American Mosquito Control Association argued that the original studies involving Vitamin B1 and mosquitoes did not include enough participants and focused solely on one species of mosquito. Their broader study also found Vitamin B1 to be ineffective.
Mosquito Bites Kill
It is important to find a good repellent since a mosquito bite has the potential to carry disease. Mosquitoes transmit disease to more than 700 million people every year. Malaria kills more than 3 million people a year. Most studies conducted have pointed to repellents that contain DEET as the only dependable mosquito deterrent.