Naturally, both green and blue spirulina contain Phycocyanin, but this is where the similarities end. Because Green Spirulina is a whole food, it contains decent source of vitamins and minerals, is high in protein and therefore contains essential amino acids. It also has a reputation for being beneficial as an anti-inflammatory (perhaps due to the effects of phycocyanin), encouraging a healthy immune system, promoting heart health, reducing high cholesterol and so much more.
The biggest difference between Green and Blue Spirulina, aside from their radical colours, is the taste! Green Spirulina is a whole cell algae, so it tastes more than a smidge like… well… algae. Given that Blue Spirulina is an extract, the smell and flavour are much more neutral, making it easy to receive some of the benefits of spirulina without the fishy taste.