In clinical research, it is found that a natural component "concanavalic acid" is rich in alfalfa, which will easily cause allergic reactions to patients with lupus erythematosus or other autoimmune disorders, so people with this disease should avoid eating it.

Extended data:

Alfalfa is the general name of Medicago, commonly known as cauliflower, which is a perennial flowering plant.

One of the most famous is Medicago sativa as a pasture. There are many kinds of alfalfa, most of which are wild herbs.

References:

Baidu encyclopedia alfalfa