Green A is the first-class spirulina in China, but the advertising cost is high, which leads to high product price. At the same time, Green A takes the national brand strategy, so the pricing is also high. Upstairs, it is said that long-term and large-scale use will lead to high iodine hyperthyroidism. But spirulina does not contain iodine, and it blows fast on the second floor. Spirulina in Yunnan is better than Green A Haidi (both have passed the health food certification, and others are health food certification). There are also products of Chenghai Green and Chenghai Lake Greenstone.