Far infrared underwear is a kind of functional underwear characterized by far infrared rays, which is said to promote blood circulation and relieve muscle fatigue. However, if the quality of far-infrared underwear is not up to standard or there are problems such as expiration, it may cause certain harm to human body. For example, the magnetic field of far-infrared underwear is too weak to play a therapeutic role; If the magnetic field is too strong, it may cause damage to the cardiovascular and cerebrovascular systems and reproductive systems. Therefore, when buying far-infrared underwear, it is recommended to choose products produced by regular manufacturers, and pay attention to check the production date and other information to ensure the quality and safety of products. In addition, when individuals use far-infrared underwear, they should also pay attention to moderate use to avoid excessive dependence and abuse to protect their health.