Experiments with piglets showed good assimilation and metabolism of iron (II) in antianaemic powder Ferosol-1. In order to improve this drug, manganese, calcium (Ferosol-2, 1 composition) and ascorbic acid (Ferosol-2, 2 composition) were added. Manganese and ascorbic acid stimulate erythropoiesis and being strong reductants stabilize iron (II) on storage and in gastrointestinal tract. Components of Ferosol-2 were identified using colour, precipitation- and extraction tests, as well as paper chromatography and absorption spectroscopy. Quantitative analysis of microelements and ascorbic acid was performed using absorption spectroscopy, extraction photometry and iodometric titration methods. Ferosol-2 proved to be more stable than Ferosol-1. Lichfield and Wilkinson method modificated by Roth was used for detection of acute toxicity of Ferosol-2. A local action was estimated on quine pigs. Iron resorption was on 20 days old piglets. Antianaemic effectiveness of Ferosol-2 was evaluated on newborn piglets watching their weight. Experiments with white mice showed low toxicity of Ferosol-2 (LD50 = 4.3 g/kg, for 1 composition and 4.6 g/kg for 2 composition). It does not irritate mucosa of duodenum and ventriculus. Iron in Ferosol-2 was found to be well assimilated in gastrointestinal tract of piglets, easily gets into blood and joins albumen of plasma. After administration of Ferosol-2 to piglets increased iron concentration in blood serum was observed for 3 hours (1 composition) and 6 hours (2 composition). Experimental data showed increased resorption of iron in Ferosol-2, 2 composition due to ascorbic acid. Components of Ferosol-2 are well assimilated and join erythropoetic processes. Ferosol-2 leads to quicker weight gain as well as significantly higher amount of hemoglobin and red blood cells in piglets.