Uncle Yao ointment can prevent sub-health and improve mild sub-health symptoms. If it is aimed at the right symptoms and the right people, it is really effective to use Grandpa Yao's ointment. It can prevent various uncomfortable symptoms brought by sub-health to human body. However, if there is a serious physical illness, Uncle Yao's ointment can't play an obvious therapeutic role at this time, that is to say, it can't have a conditioning effect, which proves that the product is invalid.