Main purpose of the study is researching the influence of spirulina platensis on the immune system on normalization of peroxide lipid oxidation and anti-oxidant activity, also on the content of long-life radionucleides. In the studies were involved children and teenagers residing in the areas with radiant pollution and people injured by the Chernobyl catastrophe. To achieve desirable results with spirulina it is recommended to take it during 3 months and if not continued, this course should be repeated in half a year again. Possible therapeutic mechanisms: a) The natural combination of nutrients supports the formation of non-absorbable complexes of radionucleides through analogues such as calcium, potassium, etc., and promotes their excretion. b) the general intake of easily digestible micro and macro elements of spirulina has a positive influence on many functions of the immune system.