The major problem with CBD bottles on the open market is that in most cases they will contain levels of THC which are higher than the amount legally allowed to sell. This means that in most states (with only a few exceptions such as California, Colorado and Oregon), THC is currently legally available only as Medical Cannabis, and should be sold only by legit dispensaries that have received proper licensing from the state.
Whole plant extracts also contain THC, although usually not in a large enough amount to have any psychological effects. When administered together, CBD, THC, trace cannabinoids as well as terpenes, produce what is known as an entourage effect. This synergistic relationship between cannabinoids, fatty acids and terpenes has been shown to increase the healing properties of each.