The influence of Cd2+ ions in different concentrations (0,5 and 2 maximum allowable concentration (MAC) on β-carotene content in tissues (organs) of Lymnaea stagnalis is researched. The dependence of researched pigments content on animal exposition duration (2, 7, 14 and 21 days) in toxic environment is established. When animals are in environment with Cd2+ ions concentration which corresponds to 0,5 MAC, the distribution of β-carotene in mollusk organisms in time has organ-specific character. When toxicant concentration increases to 2 MAC the increase of β-carotene in haemolymph (by 1,15 – 1,2 times), in hepatopancreas (by 1,32 – 1,33 times) and in leg (my 1,47 – 1,68 times) under short time exposition (2 and 7 days) and its decrease (by 22,32–54,41%) in these organs under increase of exposition time in toxic environment (to 14 days) are registered. It is established that Cd2+ ions influence during 14 days leads to statistically reliable decrease of β-carotene despite its concentration in the whole organisms of L.stagnalis (by 22,32–61,93%). The minimum content of the researched carotenoid is registered in haemolymph of animals despite the toxicant concentration and the duration of its action on organism. The maximum β-carotene content has dose-depending character, varies witlu’n organs (tissues) and depends on exposition duration.