1. Know the source of oil
The golden rule of gardening is that the quality of soil will ultimately impact the quality of the plants, fruits, or vegetables it bears. A similar rule applies to cannabis as well. The better the soil is, the lower is the risk of contamination, and you can get pure CBD. Besides that, the conditions that hemp plants grow in will determine if they contain THC or not.
You must check the geographical location from where the hemp is sourced. Hemp from Oregon or Colorado turns out to be effective and potent, owing to the favorable weather conditions and strict environmental laws.