1, it is best not to eat cold kelp overnight, because it is polluted during cold processing. Food after overnight is particularly prone to bacterial deterioration, and kelp contains a lot of nitrate, which is oxidized by air and bacteria overnight to produce viruses, which will endanger human health after eating.

2, cold kelp is best eaten on the same day, so that it will not lose nutrition, but also ensure the freshness when eating. It can be soaked for about 6 hours before eating kelp, so as to avoid the long-term dissolution of nutrients in water and reduce its nutritional value.