Since not everyone can keep bees, and honey occasionally must come from the store, here's a little free advice. Read the label. Don't buy honey if it claims to originate on three different continents. Some grocery store honey proudly boasts a heritage of multiple countries and mulitple quadrants of the globe. Scary.
Buy honey from one place....ideally from one beekeeper.
If you buy honey from your own region, it might even help your local pollen allergies. Plus, it puts a little money in the pocket of a local keeper...and you can be more sure that it is really all honey in that jar.