Hypoallergenic titanium allergenicity

grade 2 titanium has no biological role. The metal is regarded as hypoallergenic.
titanium metal powder is not found as the free element. The element is the ninth most abundant in the earth's crust. It is usually present in igneous rocks and in the sediments derived from them. It is found in the minerals rutile (TiO2), ilmenite (FeTiO3), and sphene, and is present in titanates and in many iron ores.