What is the effect on human body of eating LR grade titanium dioxide?

Titanium dioxide is used as a white pigment in pills and foods and is generally regarded as safe. This doesn't mean it's a good idea to grab a spoon and dig in. The LR (instead of USP) part could be a bit worrisome; when in doubt, calling the poison control center is almost always a much smarter move than posting a question on the internet.