Vitamin B1(thiamine, thiamin)
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Old Remedy, vitamin B-1 (thiamine), to Repel Mosquitoes

Klenner, Southern Medicine & Surgery, April, 1951
"... review[ing] the findings of McCormick in 50 confirmed cases of poliomyelitis in and around Toronto, Canada, during the epidemic of 1949... families eating brown bread who came down with poliomyelitis did not develop paralysis; whereas in those families eating white bread many of the children having poliomyelitis did develop paralysis. The point here is that brown bread has 28 times more vitamin B1 than does white bread. Obviously, then, the paralysis which complicates acute poliomyelitis appears to be due to a B1 avitaminosis."