No matter in theory or experiment, the statement that vitamin B 1 can repel mosquitoes has not been verified. In other words, vitamin B 1 has no mosquito repellent effect at all.
Vitamin B 1 can repel mosquitoes, which is a long-standing legend on the Internet. There are also many discussions about it on foreign websites, but the method of use is to take 100mg vitamin B 1 every day. If traced back to the source, vitamin B 1 mosquito repellent first came from the west in the 1940s.
1943, a doctor named W. Ray Shannon published a paper in Minnesota Medical Journal, claiming that vitamin B 1 aqueous solution is helpful to prevent mosquitoes. Unfortunately, the statement that vitamin B 1 can repel mosquitoes has not been verified theoretically or experimentally. In other words, vitamin B 1 has no mosquito repellent effect at all.
As early as 1969, some researchers have studied whether vitamin B 1 can repel mosquitoes. The title of the article bluntly points out that vitamin B 1 is not a mosquito repellent for human use. In 2005, Ives AR, a zoologist at the University of Wisconsin, and his colleagues conducted a comprehensive and in-depth study on whether vitamin B 1 can be used to repel mosquitoes. The results showed that vitamin B 1 had no effect on the number of times mosquitoes landed on the skin surface. In other words, vitamin B 1 will not have any mosquito repellent effect.
The US Food and Drug Administration (FDA) explained the OTC mosquito repellent on the market. It is clearly mentioned that vitamin B 1: oral vitamin B 1 is an OTC drug for mosquito repellent in the market. At present, there is not enough data to show that this method is effective. Those drugs labeled as OTC drugs for oral mosquito repellent are false and misleading, and there is no scientific data to support them. In short, any oral OTC drug that claims to contain mosquito repellent ingredients cannot guarantee safety and effectiveness. In addition, vitamin B 1 is not mentioned in the proven mosquito repellent ingredients published on the website of the Centers for Disease Control and Prevention (CDC).
One of the main reasons why people believe that vitamin B 1 can prevent mosquitoes is that vitamin B 1 has a disgusting taste, a faint smell and a bitter taste. People believe that it can repel mosquitoes, and it has the taste of fighting poison with poison. Humans don't like this smell, and mosquitoes probably don't like it either. Unfortunately, although this idea is good, mosquitoes don't buy it at all. For example, mosquitoes like the sweat that you and I can't avoid.
Secondly, vitamin B 1 is very water-soluble, but it brings another problem. Unstable in water, afraid of heat, easily decomposed by light. It is even more unreliable to dissolve vitamin B 1 in water and spray it again. Off-topic, some functional drinks appeared in recent years, claiming to contain water-soluble vitamin B 1, which is beneficial to human function. Don't believe it. When the drink is drunk in the mouth, it basically decomposes.
It is worth reminding that the daily demand of human body for vitamin B 1 is 1 ~ 1.5 mg, and meat, beans and nuts are rich in vitamin B 1, which generally does not need to be supplemented. Among various mosquito repellent formulations of vitamin B 1 circulated on the Internet, its dosage is close to 0/00 times that of normal human body. Although there are few reports on the excessive harm of vitamin B 1, it may interfere with the absorption of other B vitamins and the secretion of insulin and thyroxine, so it is unwise to supplement it in large quantities.