The main component of ammonium metatungstate is tungsten trioxide. Whether tungsten oxide is harmful to the human body depends on its amount and exposure method.
Tungsten oxide is very stable, insoluble in most acids except hydrofluoric acid, and insoluble in water. Therefore, if you take a small amount of tungsten oxide orally, it will not be absorbed in the body at all, and there will be no harm.
Tungsten oxide dust can be harmful if inhaled into the respiratory tract. Tungsten oxide dust can cause upper respiratory tract irritation symptoms, manifested as cough, pharyngitis, bronchospasm, asthma, etc.
Direct skin contact with tungsten oxide dust may cause discomfort such as itching
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