Here are some things I learned by searching "does sulfur repel mosquitoes" as we use it to repel chiggers, so I thought it might help with mosquitoes. They don't like me so I don't have a problem with them.
"There is no hard evidence to support the belief that eating sulfur will repel mosquitoes, but it is rumored that military personnel have practiced eating match heads to repel mosquitoes and various ticks. A recipe that is said to have been passed down over the generations as a mosquito repellent includes sulfur and does not use match heads which could potentially contain other harmful chemicals.
Thoroughly mix together 2 tsp. sulfur, 1 tsp. of Cream of Tartar and 1 pint of honey in a pint jar. Sulfur can be found over the counter in most pharmacies.
Take 1 tsp. of this recipe every day. It will take about two weeks for the repellent to become effective.
Continue consuming this recipe throughout the mosquito season. Be certain to thoroughly mix this recipe before consuming it."
http://www.ehow.com/how_5665976_eat-sulfur-mosquito-repellent.htmlwebpage
Cinnamon leaf oil (one study found it was more effective at killing mosquitoes than DEET)
Clear vanilla oil14 mixed with olive oil
Wash with citronella soap, and then put some 100 percent pure citronella essential oil on your skin. Java Citronella is considered the highest quality citronella on the market
Catnip oil (according to one study, this oil is 10 times more effective than DEET)15
Lemon eucalyptus was found very effective in a 2014 Australian study;16 a mixture of 32 percent lemon eucalyptus oil provided more than 95 percent protection for three hours, compared to a 40 percent DEET repellent that gave 100 percent protection for seven hours
Use a natural formula that contains a combination of citronella, lemongrass oil, peppermint oil and vanillin to repel mosquitoes, fleas, chiggers, ticks, and other biting insects
whttp://articles.mercola.com/sites/articles/archive/2014/08/23/mosquito-repellent.aspxebpage