Bok Choy is a cruciferous vegetable like cabbage; it is an excellent source of Beta carotene, vitamin C, thiamine, riboflavin and calcium. It contains significant amounts of nitrogen compounds known as indoles, as well as fiber - both of which appear to lower the risk of various forms of cancer. Bok Choy is also a good source of folate (folic acid). At exceedingly high consumption rates, Bok Choy can become harmful - however your pet would have to extremely over-indulge on only Bok Choy to have any adverse effect (much like if you pet over-indulges in water). At the inclusion rates we have in Pure, there is no risk of your pet having any type of negative response, and your pet will obtain the benefit of the indoles, natural folic acid, vitamin C, Beta carotene, thiamine, riboflavin, and calcium.