Studies with experimental animals have shown that ethanolic extract of Spirulina induced significant decrease of γ-radiation-induced damages to bone marrow cells most possibly due to a DNA-stabilizing effect of certain components. The same Spirulina extract protected also human progenitor cells of granulocytopoiesis from Xray radiation damages in vitro. Moreover, feeding phycocyanin extract from Spirulina to experimental animals exposed to X-rays blocked the inhibition of several metabolic processes. It has also been proved that a sulfated polysaccharide from Spirulina shows radiation protective activity. Spirulina’s health benefits for child victims of Chernobyl radiation have been documented. The children of Chernobyl suffered radiation poisoning from eating food grown on radioactive soil. Their bone marrow was damaged, rendering them immunodeficient. Radiation damaged bone marrow cannot produce normal red or white blood cells. The children suffered from anaemia and allergic reactions. Results from the Minsk, Belarus Institute of Radiation Medicine (1990-1991) have shown that ingestion of Spirulina (5 g/day for only 20 days) reduced urine radioactivity levels by 50%, while T-cell suppressors and beneficial hormones rose Unpublished results from a 1993 report confirmed 1990-91 research. Theirconclusions suggested that spirulina decreases radiation dose load received from food contaminated with radionucleides, Cesium-137 and Strontium-90 The Belarus Ministry of Health based on various tests during 1990 concluded that spirulina promotes the evacuation of radionucleides from the human body without side effects. The Ministry considered that ingestion of Spiuline was advisable for the treatment of people subject to radiation effects, and requested additional donations from private Spirulina production Companies. A Russian patent was awarded in 1994 for the use of spirulina as a medical food to reduce allergic reactions from radiation sickness. The patent was based on a study of 270 children living in highly radioactive areas. They had chronic radiation sickness and elevated levels of Immunoglobulin IgE, a marker for high allergy sensitivity. Thirty five were prescribed 20 tablets per day (about 5 grams) for 45 days. Consuming spirulina lowered the levels of IgE in the blood, which in turn, normalized allergic sensitivities in the body. Research continuing through 1999 in Belarus showed immune building, normalization of peroxide lipid oxidation and detoxifying effects of spirulina supplements in children and teenagers. It has been considered that some of the beneficial aspects of Spirulina in radiation effects may be due to its ability to bind to heavy metals and radioisotopes via protein and polysaccharide components. The available evidence seems to indicate that Spirulina has a potential to be used as an adjunct to other means of radiation protection.