Iodine

Iodine is a halogen.

Precautions and toxicity of elemental iodine

 * Elemental iodine (I2) is toxic if taken orally. The lethal dose for an adult human is 30 mg/kg, which is about 2.1-2.4 grams (even if experiments on rats demonstrated that this animals could survive after eating a 14000 mg/kg dose).
 * Elemental iodine is an oxidizing irritant and direct contact with skin can cause lesions, so iodine crystals should be handled with care.
 * Iodine supplementation in selenium-deficient populations is, in theory, problematic, partly for this reason.
 * Its toxicity derives from its oxidizing properties, which make it able to denaturate proteins (and so also enzymes).

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