If you want to find an official explanation online, if the industry explanation is as follows, Yangshengtang started in Hainan and now moved to Hangzhou. It taught China people vitamin C and vitamin E. Your family didn't make a fortune by vitamins, but it used to mainly do health care products and whitening. Later, after market segmentation, it was found that Chinese people lacked understanding of vitamins, so they made vitamins. Amway is the originator of vitamin supplementation in China. At first, Amway promoted vitamin C. Because of Amway's special sales channels, it has not spread all over the country. Later, Yangshengtang took over, and now I know what vitamin C and vitamin E are.