Note that while general hemp extracts that contain CBD are fair game, isolated CBD technically cannot be added to foods per FDA because it is considered a drug that is currently being prescribed for certain medical conditions. The FD&C specificially prohibits you from putting drugs into food.
Per the current page on their position:
It is currently illegal to market CBD by adding it to a food or labeling it as a dietary supplement.
However, FDA has no interest in enforcing this policy (and neither do state-level health departments) unless you market your items as drugs, which they constantly go after in the supplement category no matter what you sell. This is written in all the guidance that has been posted, and I confirmed it with the Seattle district office, who simply told me that unless something changes at the national level, they had plenty of other things to do and didn't care until an outbreak/illness occurred. CBD so far has a pretty good safety record, though FDA had some concerns based on some of the high dosage data in patients with liver issues, nothing health-wise has prompted any action on that front.
Heck, in California the CBD processors just said "if you don't enforce it, it's not law." Turns out they were right and the state moved forward with legislation to avoid enforcement.
Ergo, as long as you sell it, but don't make consumer claims that it will cure their whatever, no one is going to bother you, especially in states where legal cannabis in general has made it harder to draw clear enforcement lines or states that have pursued legislation to give it the green light.
However, in the event that a customer says they were harmed by your product, you're in the unfortunate position of having to claim your product did not cause them harm....even if it was illegal to sell technically.
In short: your enforcement liability for CBD products is pretty much non-existant, but your customer liability is going to leave you more exposed. Always read the current positions yourself, CBD enthusiasts normally just scream about the farm bill etc., which really didn't have a large impact on the food side of things, just the availability of hemp and hemp extracts.