WHAT?! YES, IT IS TRUE. Kale and many others have made the list of things to watch out for. One more reason to grow it yourself, or buy organic. If you cannot do either of these, fill your sink with water and vinegar and soak your vegetables and rinse and dry before refrigeration. For smoothies, I keep my kale in the freezer. Blends better and less bitter and keeps a long time . Don’t give up this amazing nutritional food. Get a pot and grow your own.