There is no claim that taking Yupingfeng San can improve immunity. The medicine can benefit qi, consolidate the epidermis and stop sweating (stop sweating by consolidating the muscular epidermis), and treat people who are weak and prone to colds. Yupingfeng San is a proprietary Chinese medicine composed of Astragalus, Fenghuang and Atractylodes Macrocephalae, which has the efficacy of benefiting qi, consolidating the epidermis and stopping sweating. It is used for those who have deficiency of the epidermis and do not consolidate the epidermis (the weakness of the muscle epidermis leads to the abnormal outflow of sweat), who have spontaneous sweating (involuntary sweating during the daytime, which is aggravated with the slightest movement of sweating) and who have bad winds, who have a whitish color (white face without luster), or who have a weak constitution and are prone to catching colds and wind evils. Astragalus in this formula is sweet and warm, which can replenish the qi of the spleen and lungs, and externally stabilize the surface to stop sweating. Rhizoma Atractylodis Macrocephalae benefits qi and strengthens the spleen (regulating the qi of the spleen and stomach), and assists Astragalus to benefit qi and consolidate the exterior. Fangfeng dispels wind evil, and when Astragalus is paired with Fangfeng, it consolidates the surface without retaining evil. Adverse effects of this drug are not clear. It is forbidden for those who are allergic to this product, and caution should be exercised for those with allergies. Avoid greasy food during the medication. If there is a need for medication, it is recommended that it be used under the guidance of a professional physician, not blindly self-medication.