 Samarium salts stimulate metabolism , but it is unclear whether this is the effect of samarium or other lanthanides present with it . The total amount of samarium in adults is about 50 µg , mostly in liver and kidneys and with about 8 µg / L being dissolved in the blood . Samarium is not absorbed by plants to a measurable concentration and therefore is normally not a part of human diet . However , a few plants and vegetables may contain up to 1 part per million of samarium . Insoluble salts of samarium are non @-@ toxic and the soluble ones are only slightly toxic . 
