As a food additive,<unk>  is on the U.S. FDA's list of generally recognized as safe, or GRAS, substances.<unk>  itself is non-toxic; it is hazardous, however, to inhale<unk>  fumes, such as generated when zinc or zinc alloys are melted and oxidized at high temperature. This problem occurs while melting alloys containing brass because the melting point of brass is close to the boiling point of zinc. Exposure to<unk>  in the air, which also occurs while welding galvanized (zinc plated) steel, can result in a malady called metal fume fever. For this reason, typically galvanized steel is not welded, or the zinc is removed first. Researchers working on the safety of<unk>  in sunscreens found that although<unk>  on its own was a safe UV absorber, in sunscreen formulations containing other UV absorbers,<unk>  caused photodegradation of small-molecule UV absorbers, which exhibited higher levels of toxicity in embryonic zebrafish assays.
Zinc oxide
Zinc sulfate 
Zinc pyrithione
Silver diammine fluoride
Amylmetacresol
Zinc cadmium sulfide
Perchloryl fluoride
Sodium hydroxide