Collagen has been gradually recognized by everyone, and collagen is the first choice for skin care products. In order to win the initiative and gain profits, merchants have mushroomed out many series of products. Zhao Zong gave us objective advice on how to choose and buy. Generally speaking, when choosing collagen products, it depends on technology. Collagen can be divided into polypeptide and oligopeptide, and oligopeptide collagen is more easily absorbed by skin and dermis from the absorption point of view. Second, look at the content: the human body needs to supplement 5-7g of collagen every day, and most collagen brands are around 3g, which is difficult to meet the needs of the human body; Third, look at raw materials: we should pay attention to choose collagen extracted from deep-sea fish skin, which is closest to human tissue and most suitable for human absorption, and can also avoid animal epidemic infection and ensure the natural purity of products; Fourth, look at purity: high-purity collagen is safer to take, and consumers must choose products without any additives when choosing; Fifth, look at certification: there are various import and export inspection and quarantine standards, and we should choose products that have passed QS certification to ensure quality.