It's hard to believe that such a simple dirt cheap, highly effective remedy exists given the fact that pesticide companies are constantly barraging us with their expensive products containing potentially toxic ingredients such as Deet.
Vitamin B1 Tablets
a Spray Bottle
Crush up 5 vitamin B1 tablets (Thiamine) and pour the powder into a spray bottle of warm water (about 1 1/2 cups). Cap the bottle off, shake gently to ensure they're fully dissolved.
Spritz your skin with the mixture. Voila, you have just created a completely safe, non-toxic homemade bug spray that actually works!
If you want to create a travel size bug spray, simply use a 2 oz travel size bottle, and use 1-2 crushed tablets.
Some studies suggest that taking Thiamine 25 to 50 mg three times per day is effective in reducing mosquito bites. A large intake of thiamine produces a skin odor that is not detectable by humans, but is disagreeable to female mosquitoes. Incidentally, females are the only ones that bite, males do not bite.
Thiamine takes more than 2 weeks before the odor fully saturates the skin, so it is considerably easier to apply it topically for rapid effect.
Disclaimer for People who'd rather sue for a living than work for one: You are responsible for yourself, we're not doctors, lawyers, etc, this is just what we use on our own family. Please understand that you are solely responsible for the use of any information given on this site and use of any information will be at your own risk.
Kline, D. L. 1994. Olfactory attractants for mosquito surveillance and control: 1-octen-3 ol. J Am Mosq Control Assoc 10:280–287. PubMed
Kodkani, N., J. M. Jenkins, and C. F. Hatz. 1999. Travel advice given by pharmacists. J Travel Med 6:87–93. Crossref, PubMed
Lindsay, S. W., J. H. Adiamah, J. E. Miller, R. J. Pleass, and J. R. M. Armstrong. 1993. Variation in attractiveness of human subjects to malaria mosquitoes (Diptera: Culicidae) in the Gambia. J Am Mosq Control Assoc 30:368–373.
Maasch, H. J. 1973. Investigations on the repellent effect of vitamin B1. Z Tropen Med Parasit 4:119–122.