Do Vitamins Really Stop Midges?

December 13, 2025 •

4 min read

Despite widespread anecdotal claims, scientific studies have shown that vitamins, particularly B vitamins, are not effective in repelling midges and other biting insects. The persistent myth suggests that a supplement can alter your body odor to be repulsive to pests, but controlled experiments have found no evidence to support this belief.

Quick Summary

This article examines the scientific basis for using vitamins to repel midges, comparing anecdotal evidence with controlled studies. It reviews popular beliefs about Vitamin B1 and body odor, highlighting a lack of credible support. The content also provides a comprehensive overview of scientifically proven and effective strategies to protect against midge bites.

Key Points

Vitamin B Does Not Repel Midges: Controlled scientific studies have repeatedly shown that B vitamins, including thiamine (B1), are ineffective at repelling midges.
The Myth Stems from Anecdotal Evidence: The belief that vitamins alter body odor to deter insects is not supported by scientific fact and is likely based on unsubstantiated personal accounts.
Rely on Proven Repellents: For effective protection, use CDC-recommended topical repellents containing active ingredients like DEET or picaridin.
Combine with Physical Barriers: Wear protective clothing, such as long sleeves and trousers, and utilize fine-mesh screens to create a physical barrier against midges.
Manage Your Environment: Midges prefer still air; creating a breeze with a fan can be a simple and effective deterrent. Avoiding stagnant water also helps reduce breeding grounds.
Avoid Peak Midge Activity Times: Midges are most active during dawn and dusk. Plan outdoor activities to avoid these peak hours whenever possible.

The Science Behind the Vitamin Myth

The idea that taking B vitamins, especially thiamine (B1), can repel midges and mosquitoes has circulated for decades. The theory posits that the excess vitamin, when excreted through sweat, creates a smell that is undetectable to humans but unpleasant to biting insects. However, this theory is not supported by rigorous, controlled scientific evidence.

A systematic review published in the Bulletin of Entomological Research concluded that oral thiamine is ineffective at repelling arthropods, regardless of the dosage. Controlled laboratory experiments have consistently failed to show a reduced biting rate in individuals taking vitamin supplements compared to those taking a placebo. The overwhelming consensus among scientific and public health experts, including the U.S. Centers for Disease Control and Prevention (CDC), is that this is a myth.

Why the Anecdotal Evidence Persists

The persistence of this belief can be attributed to several factors. Many people may experience a psychological effect, believing they are protected, while others may attribute a lack of bites to the vitamins rather than other factors. Insect populations, environmental conditions, and individual variations can also influence bite rates. For instance, midges are known to be less active in breezy conditions or during sunny daylight hours, factors that are more likely to influence bite frequency than a person's vitamin intake.

Proven and Effective Midge Repellent Strategies

Instead of relying on unproven vitamin remedies, outdoor enthusiasts should turn to strategies with documented effectiveness. A combination of physical barriers, chemical repellents, and environmental controls offers the best protection.

Physical and Environmental Protection

Create a Breeze: Midges are weak flyers and are easily deterred by air movement. Using an electric fan on a patio or camping near a naturally breezy area can be very effective.
Wear Protective Clothing: Covering up with long-sleeved shirts, trousers, and hats minimizes exposed skin. Lightweight, breathable fabrics can help you stay comfortable while covered.
Avoid Peak Hours: Midges are most active during dawn and dusk, and on still, humid days. Avoiding outdoor activity during these times can drastically reduce your exposure.
Use Screens and Nets: When in a tent, cabin, or camper, ensure all windows and doors are fitted with fine-mesh screens to keep midges out. A midge net can be used over a sleeping area for extra protection.

Chemical and Topical Repellents

DEET: This is one of the most well-known and effective insect repellents available, with decades of proven results against biting insects.
Picaridin: Derived from the black pepper plant, picaridin is another CDC-recommended repellent that is effective and often preferred by those sensitive to DEET.
Lemon Eucalyptus Oil: An effective plant-based repellent endorsed by the CDC, it offers protection against midges and mosquitoes.
Permethrin: This insecticide is for use on clothing and gear, not directly on the skin. It provides a long-lasting protective barrier against midges and other insects.

Comparing Midge Repellent Methods


Method	How It Works	Level of Scientific Support	Pros	Cons
B Vitamins (Thiamine)	In theory, excreted through sweat to alter body odor, making it repulsive to insects.	Anecdotal / Low. Overwhelming evidence shows it is ineffective.	Natural approach, potential health benefits from vitamins themselves.	Does not work as an insect repellent; creates a false sense of security.
DEET-based Repellents	Interferes with a midge's ability to locate and land on a person.	High (CDC recommended).	Highly effective, well-researched, long-lasting protection.	Can have a strong odor, some individuals have skin sensitivities.
Picaridin Repellents	Similar to DEET, disrupts insect sensory receptors.	High (CDC recommended).	Highly effective, less pungent odor than DEET, and non-greasy.	Needs to be reapplied more often than DEET in some formulations.
Lemon Eucalyptus Oil	Natural plant-based oil with repellent properties.	High (CDC recommended).	Plant-based, pleasant scent.	Shorter-lasting effect, may not be as potent as synthetic alternatives.
Protective Clothing	Provides a physical barrier, blocking access to skin.	High.	No chemicals required, breathable options available.	Can be hot to wear, some fabrics may be less effective.

Conclusion

The idea that certain vitamins, particularly Vitamin B, can stop midges is a persistent myth that lacks scientific backing. Relying on this unproven method leaves you vulnerable to bites. For genuinely effective protection, the best approach involves a combination of proven strategies, including using CDC-recommended topical repellents like DEET or picaridin, wearing protective clothing, and managing your environment to deter midges. By focusing on these reliable methods, you can enjoy the outdoors with confidence and comfort, without falling prey to pesky midge bites. Consult a medical professional for personalized advice on any supplement regimen, especially if pregnant or have other health conditions.

One more effective natural remedy for midge control involves creating a home repellent with essential oils. A blend of equal parts baby oil, an antiseptic like Dettol, and aromatic oils such as citronella or eucalyptus can be applied to exposed skin to provide some protection, although often less potent than commercial repellents.

Frequently Asked Questions

No, consuming garlic or other strong-smelling foods is not a scientifically proven method for repelling midges or other biting insects. While some anecdotal accounts suggest a connection, controlled studies have found no evidence to support this claim.

The belief is based on the unproven theory that excess thiamine (Vitamin B1) is excreted through sweat, creating a scent that repels insects. However, scientific studies have discredited this theory, with any perceived effect likely being psychological or a coincidence.

The most effective repellents for midges and other biting insects contain active ingredients recommended by the CDC, such as DEET or picaridin. Natural alternatives like lemon eucalyptus oil are also effective.

You can use physical barriers such as wearing long-sleeved clothing and hats. Creating a breeze with a fan is also effective, as midges are weak flyers. Avoid outdoor activities during peak midge hours, like dawn and dusk.

While Vitamin B supplements are generally safe, using them for the purpose of repelling midges is not recommended because it is ineffective and may provide a false sense of security. Always consult a healthcare provider before starting any new supplement regimen.

Yes, midge traps can be effective in reducing local populations. Citronella candles and incense can also help repel midges in localized, enclosed outdoor spaces, such as a patio or deck.

Midges are primarily attracted to the carbon dioxide we exhale, body heat, and certain compounds in our sweat. Factors like genetics and blood type also play a role in how attractive a person is to biting insects.