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Arsenic
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ATSDR: Lead
Find out about this hazardous substance, where it can be found, and how to reduce the risk of exposure. From the Agency for Toxic Substances and Disease Registry.http://www.atsdr.cdc.gov/tfacts13.html
ATSDR: Mercury
Learn about this hazardous, naturally occurring metal, how it can affect you, and where it may be found. From the Agency for Toxic Substances and Disease Registry.http://www.atsdr.cdc.gov/tfacts46.html
Gold
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Helium
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Hydrogen
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Iron
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Magnesium
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Manganese
Find out about this important trace element that may be needed for the utilization of vitamin B1 in the diet.http://periodic.lanl.gov/elements/25.html
Neon
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