Vitamin C can reduce the duration of upper respiratory tract infections. If the daily intake of vitamin C through fruits and vegetables and other diets is not sufficient, moderate supplementation with vitamin C effervescent tablets is necessary but not yet preventive for this new coronavirus pneumonia. Protein powder has a high protein content and its use is to supplement protein for those who lack it. For the elderly, pregnant women, people with chronic diseases and those who are relatively weak, protein powder supplementation can improve immunity. However, for the general population, immunity enhancement is a complex process and relying on protein powders alone to improve immunity is not reliable and requires attention to the overall intake of nutrients from the diet. Patients with existing liver and kidney diseases and other serious illnesses are advised to consult a specialist before taking them.