American ginseng can improve human immunity, thus playing a role in preventing colds. Does not have the function of directly resisting viruses. However, try not to take tonic when you have a cold! There is a theory in Chinese medicine: in the case of "old diseases and new diseases", don't rush to treat the old diseases first, but cure the new diseases first, because if you don't try your best to cure the new diseases, the new diseases will be dragged into the old diseases, and the situation will be bad at that time. If the new disease is "exogenous disease", that is, a disease caused by the invasion of exogenous pathogens, such as a cold, the old disease belongs to "physical weakness and internal injury"

There are several disadvantages in taking tonic when you have a cold: First, to treat a cold, you need to sweat to relieve exterior symptoms and eliminate evil spirits. American ginseng and other tonic drugs not only do not have this effect, but also stagnate the muscle surface and hinder the spread of exogenous pathogens; Secondly, taking tonic not only provides nutrition for the body, but also provides nutrition for diseases and pathogens, making bacteria and viruses more vital, thus "staying indoors" and aggravating the condition; Thirdly, improper use of tonic medicine will produce damp heat, which will lead to stagnation of middle qi and poor qi movement, which will affect the function of spleen and stomach, which is not conducive to patients' recuperation and recovery of health; Finally, tonic drugs are likely to conflict with drugs used to treat new diseases, causing harm to patients' health.