Spirulina’s a blue-green algae that’s over 3 billion years old, and one of the oldest and most nutritious foods on the planet. Golden Green's Organic Spirulina is cultivated in special fresh water pools to maintain a pure, organic environment. Once harvested it's hand-washed and gently dried before being milled into fine powder. Ingredients: 100% Pure, Soil Association Certified Organic Spirulina Powder.