<unk>  is a medical condition involving an overdose on, or toxic overexposure to,<unk> . Such toxicity levels have been seen to occur at ingestion of greater than 50 mg of<unk> . Excessive absorption of<unk>  can suppress copper and iron absorption. The free<unk>  ion in solution is highly toxic to bacteria, plants, invertebrates, and even vertebrate fish.<unk>  is an essential trace metal with very low toxicity in humans.
Zinc toxicity
Lead poisoning
Mercury poisoning
Zinc deficiency
Manganese deficiency 
Iron poisoning
Copper toxicity
Mercury Poisoning