What is spirulina?Spirulina is a type of blue-green algae that grows in both fresh and saltwater. It’s also commercially produced for use in food and supplements (1, 2).Because it packs 60% protein by weight — as well as various vitamins and minerals — it’s widely used as a food source in certain parts of Mexico and Africa (1).What’s more, it’s a good source of healthy polyunsaturated fats and the antioxidants, C-phycocyanin and beta carotene (1, 3).As a supplement, it’s touted for its antibacterial, antioxidant, anti-inflammatory, immune-boosting, and cholesterol-lowering potential (4).SummarySpirulina is a blue-green algae commonly used as a dietary supplement. It may provide antioxidant, anti-inflammatory, and immune-boosting benefits.Side effects and downsidesAlthough spirulina is generally considered safe, it may have some side effects and drawbacks — especially for people with certain health conditions (2, 4).Here are some of the potential side effects and downsides of spirulina:...
