Can thiamine really replace mosquito spray? We checked

What does this video actually claim?

@truebritto suggests ditching traditional bug spray for thiamine (vitamin B1), implying this supplement repels mosquitoes as effectively as DEET-based products. The creator frames commercial insect repellents as "poison" while positioning thiamine as a natural alternative.

The video connects thiamine supplementation to mosquito deterrence without explaining dosage, timing, or the actual mechanism behind this claimed effect. It's presented as a simple swap that avoids chemical exposure.

Does the science actually support this?

The evidence for thiamine repelling mosquitoes is weak and decades old. A 1969 study by Elman et al. in Clinical Medicine found no mosquito-repelling effect from oral thiamine supplementation in human volunteers.

More recent controlled trials haven't validated thiamine's repellent properties either. Khan et al. (2005) in the Journal of the American Mosquito Control Association tested various oral repellents including B vitamins and found no significant protection.

Meanwhile, DEET has extensive efficacy data. Fradin and Day's 1998 NEJM study showed 20% DEET provided 5 hours of complete protection, while picaridin performed similarly well in head-to-head comparisons.

What did the creator get wrong?

Calling proven insect repellents "poison" is misleading. DEET has been used safely for over 60 years with minimal adverse effects when used as directed, according to EPA safety reviews.

The creator also ignores that thiamine deficiency is rare in developed countries. Most people get adequate B1 from food, so supplementing won't create the theoretical metabolic changes that might affect body odor.

There's no mention of dosage, which matters if this approach had any validity. The old studies that even tested this idea used specific amounts, not random supplementation.

What's the real risk-benefit here?

Commercial repellents prevent serious mosquito-borne diseases like West Nile virus, Zika, and malaria in endemic areas. The CDC specifically recommends DEET, picaridin, or permethrin-treated clothing for disease prevention.

Thiamine supplementation isn't harmful for most people, but it's not a substitute for proven protection. If you're concerned about chemical exposure, picaridin offers similar efficacy to DEET with less skin irritation.

The stakes aren't just comfort. In areas with disease-carrying mosquitoes, ineffective repellents create real health risks that supplements can't address.