Blue spirulina is a concentrated extract that isolates phycocyanin, the blue pigment found in blue-green algae. The extraction strips away whole spirulina's protein, fats, and most vitamins. Consumers pick it for a vivid natural colorant without the strong taste of whole algae. It adds a bright blue hue to smoothies, lattes, and baked goods. Since this extract lacks a full nutrient payload, you cannot use it as a nutritional replacement for standard spirulina. Quality differs across brands. Contamination with microcystins, which are liver toxins, remains a known hazard. Source only from suppliers that publish third-party tested purity results.
People add small amounts, typically 250 to 500 mg, into liquids for color. The protein and B-vitamin load of whole spirulina is absent here. Some users seek antioxidant support because phycocyanin acts as an antioxidant, but solid evidence backing additional health perks sits thin.
Any blue spirulina extract carries a risk of hepatotoxic microcystin contamination. Steer clear if you have a liver condition, are pregnant, nursing, or giving it to children. Choose a brand that shows third-party lab proof of purity.