Your best bet is to read the herbicide label online before you actually buy it. The developers have already done the experimenting both for effectiveness and safety, and the EPA reviewed their results before they approved the product. I know that there is a lot of distrust of corporations and government, but that is where I go first to get my information on pesticides and herbicides. Searching on websites that end in ".edu" is another good source. Folks on this forum know a lot, but checking the herbicide label is a good double check. Even the best of us can be mistaken sometimes.