People are often used to winter tonic, so why winter tonic? Due to the cold climate in winter, plants and animals in nature are in a dormant collection state. People also conform to the changes of nature and enter the winter storage season, just as the ancient Chinese medicine book Neijing said: "Spring is born, summer is long, autumn harvest is common, and winter storage is common; People should also respond. " He said: "People who live in winter and March are sealed." In other words, from March to winter is a good time to recharge your batteries. At this time, people's skin and muscles are dense, sweating is less, and the ingested nutrients are easy to store. In addition, in winter, people have a strong appetite, so this is the best time to take supplements, especially after the winter solstice. "Complement" is generally aimed at "deficiency". Kidney deficiency in the elderly is the main reason, so tonifying the kidney is particularly important. But winter tonic also means "prevention", that is, tonic can prevent the occurrence of diseases, so as to achieve the purpose of health and fitness. As the ancient Chinese medicine book Neijing said: "Therefore, those who store sperm will not get sick in spring", that is to say, tonic in winter can store essence in the body and prevent it from getting sick in spring. On the other hand, if you can't do this, it is "no essence in winter, no disease in spring", which is exactly the concept of "preventing disease" in traditional Chinese medicine, that is, the idea of prevention first. Traditionally, winter tonic is mainly ointment, because ointment is highly concentrated, small in size, convenient to take and convenient for long-term use. Because the cream is mostly composed of nourishing drugs, it is easy to deteriorate in hot weather, but it is easy to preserve in winter, which is one of the reasons for tonic in winter.