Higher in protein than meat, this supplement turns plain water or juice into an immune-boosting glass of good health. Spirulina Powder is a dark green fine powder made from blue-green algae that thrive in high alkaline fresh water. It's rich in iron and B vitamins and full of minerals and antioxidants. Its consumption is associated with a host of health benefits when stirred into water or juice. It's the ingredient that gives many fresh juices and smoothies a bright green colour.