The primary thing freezing does to the living spirulina is stop the cells’ enzymatic life energy.
Freezing is like suspended animation of the nutrients. Freezing whole fresh Raw Living Spirulina does rupture some of the cells; however, it does not destroy the nutrition like heating (powdered). Freezing reduces the nutritional value by approximately 5% immediately upon freezing, and there is roughly a 5% monthly loss. Home freezers go through regular defrost cycles and thus will further degrade the nutrient value of the Spirulina over time, so it is best to consume within three months after freezing.