Look at the label first: Spirulina has four grades: feed grade, food grade, health care grade and pharmaceutical grade. The health food of regular manufacturers should have the batch number of China Ministry of Health: Wei Jian Zi (××)No. ×× and the health food logo: straw hat shape.
Second, look at the color: real natural spirulina, 100%, regardless of powder, tablets, capsules, algae powder is dark green (not only look at the surface, but also look at the cross-section color) with yellow. Green spirulina is either fake or mixed with other substances. Because spirulina is very dry and easy to absorb moisture, it will gradually turn green after absorbing moisture, and it is easy to rot and deteriorate. Eating this spirulina is not only unhealthy, but also harmful. 3. Smell: Spirulina has a special smell of seaweed or ocean. It's definitely not spirulina. It doesn't taste like this. But what smells bad is probably fake and shoddy products.
Fourth, look at hardness: it can be distinguished by hand. The harder the spirulina is, the more other ingredients are mixed, and the high-quality spirulina can be separated by hand.
Taste: Spirulina is delicious and generally slightly alkaline. If the smell of alkali is heavy, it is not up to standard. In addition, 100% spirulina is very sticky.
Water-soluble observation method: put spirulina powder and tablets into a glass filled with pure water, and observe the color of the water after dissolution. If it is of high quality, the water should be green and gradually turn blue after half an hour.
Seven, look at the packaging: some nutrients of spirulina need to be isolated from the air, such as phycocyanin, carotene and so on. These nutrients lose 50% in sunlight 15 minutes. Therefore, in order to avoid direct contact with light and air and ensure that nutrients are not lost, large international spirulina production enterprises generally use small bags of aluminum foil for packaging.