Laboratory and animal studies have investigated compounds found in spirulina, including antioxidant and cell-signalling effects. Those findings do not demonstrate that eating spirulina prevents or treats cancer in people.
We do not have sufficient human clinical evidence to present spirulina as a cancer therapy or a cancer-prevention measure. People receiving cancer treatment should discuss supplements and major dietary changes with their oncology team because products and medicines can interact.
SPRU is a food, not a cancer treatment, and should never replace screening, diagnosis or prescribed care.