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Tungsten (W)

Tungsten has been shown to act by antagonizing the action of the essential trace element, Molybdenum. Tungsten metal powder administered to animals has been shown in several studies as not altogether inert, but no chronic effects are known.

Inhalation will cause irritation to the lungs and mucus membrane. Irritation to the eyes will cause watering and redness. Reddening, scaling, and itching are characteristics of skin inflammation. Repeated or prolong exposure to this compound is not known to aggravate medical conditions.

No tungsten toxicity from food has been recorded.

Sources :http://www.lenntech.com/periodic-chart.htm