Phycocyanin is an intracellular protein, which is an extract from Spirulina. It is separated by breaking the spirulina cell sediment. Because it appears blue after extraction, it is called phycocyanin. It is a natural, edible and harmless pigment. It is the only azure blue pigment allowed by the US FDA, and neither the US FDA nor the EU restricts its usage, so you can eat it with confidence.
Foreword: Japan is the country that developed and applied phycocyanin earlier. Phycocyanin is also the only natural blue pigment approved by the US FDA. The European Union is also passing relevant laws and regulations. China's GB2760 food additives catalog also allows phycocyanin to be used as a nat