There is no such thing as “the fastest way to restore immunity”. You should go to the hospital for further examination to identify the specific cause of immunity decline and treat the cause under the guidance of the doctor. You can improve your immunity through general treatment and medication. 1. Treatment of primary diseases: diabetes, hyperthyroidism, thyroiditis and other diseases can lead to decreased immunity, and should be treated according to the cause. 2. General treatment: When people’s immunity drops, they can take in foods rich in vitamins and proteins (such as vegetables and meat, etc.), have balanced nutrition, increase exercise, and avoid bad habits such as staying up late at night, drinking alcohol and smoking. 3. Medication: When the immunity is seriously reduced, you can use drugs to improve immunity under the guidance of a doctor. It is recommended to consult a doctor in time and standardize the treatment.