Blue spirulina powder is a vibrant blue extract derived from spirulina (Arthrospira platensis), a nutrient-rich blue-green microalga that has been consumed for centuries as a food. Unlike whole green spirulina, blue spirulina is a purified extract that contains little to no chlorophyll, giving it a milder flavor and brilliant natural blue color. Its primary bioactive compound is phycocyanin, the antioxidant pigment responsible for spirulina's distinctive blue hue.

Blue spirulina is commonly added to smoothies, smoothie bowls, yogurt, energy bites, electrolyte drinks, and desserts to boost antioxidant intake while creating a naturally vibrant blue color. Although it contains fewer vitamins and minerals than whole spirulina, it is valued for its concentrated phycocyanin content and antioxidant properties.