Blue spirulina, also known as phycocyanin, is a natural blue pigment derived from spirulina algae. Widely used across various industries, including food, beverages, and cosmetics, blue spirulina provides a vibrant blue hue. Its natural origin makes it a popular choice for those seeking plant-based colorants. Commonly employed as a natural dye in products like smoothies, ice creams, and skincare items. Due to its plant-based nature, it is suitable for vegan and vegetarian products, offering a stable and bright color alternative.