First of all, there are few species of ragweed in China, which are not as widely distributed as in Europe and America, and rarely enter our living areas. It is very difficult for China people to see them in their daily lives, so naturally it will not do great harm to China people. There is also a very important factor, which has a great relationship with our diet. The toxin of Swertia macrophylla is furan coumarin, which is found in many foods in China, such as carrots and oranges. These foods all contain trace amounts of furan coumarin, which is not as high as Swertia macrophylla.

We often eat these foods in our daily life, and we are also exposed to small doses of furan coumarin. Our bodies have produced certain antibodies to this toxin, so it does much less harm to us than Europeans and Americans. A small dose of furocoumarin will not cause great harm to the body, but if you eat a lot at a time, you will feel uncomfortable. In particular, people who are sensitive to the stomach and take anti-tumor and hypolipidemic drugs should avoid eating or contacting such toxins to avoid serious harm.