Spirulina is a blue-green alga which is believed to be the first form of plant life on earth (nearly 3.5 billion years old). Since its rediscovery in the 1960's, Spirulina has been exhaustively and extensively tested by scientists around the world. And has proved to be the most powerful and... Spirulina is a blue-green alga which is believed to be the first form of plant life on earth (nearly 3.5 billion years old). Since its rediscovery in the 1960's, Spirulina has been exhaustively and extensively tested by scientists around the world. And has proved to be the most powerful and...