This week, Dr. Mehmet Oz, MD, American television star of The Dr. Oz Show, caused a stir with claims that a popular brand of apple juice contained high levels of a not-so-tasty toxin.

In his investigation, Dr. Oz commissioned a private lab, which tests yielded high levels of arsenic in some top-shelf brands. The US-based Food and Drug Administration (FDA) responded to the show by running their own tests, which found considerably lower amounts of arsenic. In particular, their tests distinguished between various forms of arsenic, and found only trace amounts of inorganic arsenic, which they say is poisonous to humans.