Brown kelp is better. According to the inquiry of Leha Health Care, when choosing kelp, we should pay attention to choosing kelp with natural color, thick texture and fleshy quality, and don't be too bright in color. The freshness of kelp can also be judged by observing the state of kelp. Fresh kelp is usually natural brown or green, with smooth surface and no peculiar smell. Green kelp is fresh, while yellow-brown kelp may have been preserved for a long time. Green kelp is generally thicker, the meat is thicker and the taste is better. Yellow-brown kelp may be fresh, but it will be preserved for a long time.