Consumption of spirulina may cause side effects such as dizziness, headache, diarrhea, and in severe cases, allergic reactions, such as mild skin rashes and eczema, or symptoms such as fever and vomiting, etc. If there are any uncomfortable symptoms, it is recommended to discontinue the use of spirulina immediately, go to the hospital to find out the cause, and then follow the doctor’s instructions to consume it. Spirulina belongs to a kind of aquatic plants, because it is rich in protein and amino acids, so the market also has spirulina this kind of health products. Containing protein up to 60% -70%, composed of 18 kinds of amino acids, of which 8 kinds of amino acids are essential amino acids that are necessary for human body and cannot be synthesized by human body itself. Note that health products can not replace drugs. Pregnant and lactating women should take it with caution. This is because Spirulina is susceptible to contamination by other algae in the cultivation process, some of which are known to produce toxins, such as microcystin, so it is not recommended to consume Spirulina for the sake of the health of the fetus and the baby. People with phenylketonuria should not consume, mainly because spirulina contains an amino acid called phenylalanine, and the lack of phenylalanine hydroxylase in patients with phenylketonuria, resulting in the human body can not be metabolized normally phenylalanine, so if the patients consume spirulina may aggravate the condition.