of bones and enamel on teeth. However, when taken in an excessive amount can cause a disease called "Fluorosis', in which bone deformations and yellowing of teeth are seen. Fluorine can occur naturally in some areas in ground water.

Iron

Humans

Roughly 5 grams of iron are present in the human body and is the most abundant trace metal. It is absorbed in the intestine as heme or non-heme iron

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