How does vitamin B1 stop mosquitos biting?
It may but even vitamin B1 alone can do the trick. It is most
efficient when used topically such as in the numerous natural
insect repellent patches on the market now. A typical adult only
needs about 75 mg of it if used topically. But much more would be
required if taken in the form of a pill because much of it will be
filtered out by digestive acid and the liver. Also taking an oral
supplement takes hours before that vitamin "scent" starts seeping
out your pours, whereas a topical can start working in one hour and
last 24 hours.
Basically it works by masking your normal human scent and makes
it harder for mosquitoes to find you.