For those on fence about Titanium use, here is a huge discussion thread by those that use Titanium.
‘The U.S. Food & Drug Administration (2002) allows for its ingestion, external application including the eye area, and considers it a safe substance for public health. Other epidemiological studies showed that workers exposed to titanium dioxide exhibited no statistically significant relationship between such exposure with lung cancer and respiratory disease, although some cases of pulmonary fibrosis did occur. These studies were conducted in industrial settings where the increased exposure puts these individuals more at risk than the average person.’
also, notwithstanding cross-species comparison issue between rodents and humans, rats dosed with massive levels (250mg/m3) for 2 years (!) developed some small benign tumours which later healed. They did not do so even at 50mg/m3. As far as I can tell, mice don’t even get these benign tumours…