Vitamin D

Heavy metals block the absorption of Vitamin D. Additionally, Vitamin D may "help" heavy metals be absorbed and retained in your body. 

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THE ROLE OF VITAMIN D IN TOXIC METAL ABSORPTION: A REVIEW

Vitamin D increases intestinal calcium and phosphate absorption. Not so well known, however, is that vitamin D stimulates the co-absorption of other essential minerals like magnesium, iron, and zinc; toxic metals including lead, cadmium, aluminum, and cobalt; and radioactive isotopes such as strontium and cesium. Vitamin D may contribute to the pathologies induced by toxic metals by increasing their absorption and retention. Reciprocally, lead, cadmium, aluminum, and strontium interfere with normal vitamin D metabolism by blocking renal synthesis of 1,25-dihydroxyvitamin D. 

Moon, J. “The role of vitamin D in toxic metal absorption: a review.” Journal of the American College of Nutrition vol. 13,6 (1994): 559-64. doi:10.1080/07315724.1994.10718447