Patient's question:
When I bought for my child, I noticed a problem: some can be shaken evenly with a light shake and have a whitish color, while another requires a lot of effort and a longer time to shake evenly, and it has a yellower color. Which is better, then?Doctor's answer:
Good quality must have complete packaging, strictly and clearly marked with the trademark, manufacturer's name, origin, production date, batch number, QS and ISO certification, etc. However, poor quality may have complete packaging, but other information such as production date, batch number, and shelf life may be unclear or tampered with. Such should never be purchased.