[] the vitamin D3 I used to take had no effect. Is there a better new brand?
There are many good brands of vitamin D3. If you are not clear, you can refer to the top ten brands recommended by China Brand Network. There are 2 1 Jinweita, Yangshengtang, Vitamins, Jinerkang, Shancun, Amway Nutrilite, Golden Partner and so on, all of which are good brands. You can go and have a look first.