No one knows!: Concerns about possible toxicity of titanium dioxide, a common (but unnecessary) additive in many supplements & medications, are not a hoax but may be over-exaggerated. Rats who breathe in large amounts of TD dust get more lung cancer but safety studies on humans ingesting it have not been done. The small amounts in supps may be safe but I try to avoid it. See http://tinyurl.com/nyp6unq
Answered 12/7/2014
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