Spirulina is a blue-green algae sold as a dietary supplement to boost immunity and ward off disease. In one study, spirulina relieved allergy symptoms such as a runny nose, sneezing, congestion, and itching. The supplement may work by preventing the release of histamines, chemicals that trigger allergy symptoms.
Spirulina is generally safe, but because it can be contaminated with other substances, look for a reputable supplement brand. People with phenylketonuria should avoid spirulina because it’s high in the amino acid phenylalanine, which they can’t metabolize.
March 30, 2020
Janet O’Dell, RN