1. Vetch is poisonous. Heating destroys the alkaloids in it, which can reduce the toxicity. It can be eaten properly if handled properly, but consumption is not recommended.

2. The plants are poisonous and the fruits are slightly poisonous (containing trace amounts of hydrocyanic acid). The toxicity is greatest during the flowering and fruiting stages. At this time, it is necessary to prevent herbivorous livestock from accidentally eating it. Generally speaking, poisoning is relatively slow and symptoms will not appear until half a month to a month. In the early stage of poisoning, the movement is sluggish, in the middle stage, the symptoms are very excited and restless, and in the later stage, the body becomes weightless and unresponsive, accompanied by constipation, jaundice, hematuria, hair loss and other phenomena. Therefore it will be less toxic.

3. If you eat the fruit, be sure to boil it thoroughly. You can also use traditional Chinese medicine, but be careful because most traditional Chinese medicines have not undergone toxicological analysis, so you must not be superstitious. Generally speaking, acute poisoning is rare, and death after poisoning is even rarer. As long as you stop eating this herb in time, it won't be a big problem.

Extended information:

1. Alkaloids are a type of nitrogen-containing alkaline organic compounds that exist in nature (mainly in plants, but some also exist in animals). They have alkaline-like properties, so they were also called pseudobases in the past. Most of them have complex ring structures, with most nitrogen contained in the ring. They have significant biological activity and are one of the important active ingredients in Chinese herbal medicine.

2. It has optical activity. Some nitrogen-containing organic compounds that are not alkaline and come from plants have obvious biological activity, so they are still included in the scope of alkaloids. And some are derived from natural nitrogen-containing organic compounds, such as certain vitamins, amino acids, and peptides, and are not traditionally classified as "alkaloids."

References:

Baidu Encyclopedia: Alkaloids