7. What scientific evidence is there to support that Vitamin B1 works?

Some studies suggest that taking thiamine (Vitamin B1) 25mg to 50 mg three times per day(orally) is effective in reducing mosquito bites. Thiamine produces a skin odor that is not detectable by humans, but is disagreeable to pregnant mosquitoes (Pediatric Clinics of North America, 16:191, 1969). It seems to be especially effective for those people with large allergic reactions to bites. When taken orally, thiamine takes about 2 weeks before the odor fully saturates the skin, however, with the patch, it only takes two hours.

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