Can taking supplements like passionflower and valerian be possibly bad for you bc they are not regulated or tested that often?

Good question: You are correct that supplements do not undergo the same stringent testing as pharmaceutical drugs (called current Good Manufacturing Practice). It is wise to be sure that any supplements you are considering ingesting or using be approved by a local regulatory authority (e.g. Food and Drug Administration in the USA). Here's the website: https://www.fda.gov/Food/DietarySupplements/default.htm