The influence of the new preparation from „Spirulina” biomass – „Ferribior” which containing the immune active amino acids and iron on the content of neutrophils, phagocitary and functional activity of neutrophils „in vitro” was investigated. There were examined 40 patients of different age, both male and female sex with diverse forms of pulmonary tuberculosis and 50 healthy persons (control group), where „in vitro” means that preparation „Ferribior” has both stimulatory and suppressive action on the containing of neutrophils and their phagocitary and functional activity. The action of the preparation „Ferribior” is dependent of the initial parameters of the natural resistance. Thus, the preparation „Ferribior” has stimulatory action at the patients with the low initial parameters (subnormal), suppressive action at the patients with increased parameters and the preparation has no action, when parameters are situated in normal limits. As a result, such a mechanism of action on the changed parameters of natural resistance is characteristic for immunomodulators from the adaptogens group that permits to classificate the preparation „Ferribior” to the group of immunomodulators of vegetal origin (adaptogens).