You may know about CBD oil’s various health and wellness benefits, but most of us are a little less informed about the substance’s production and what we should know before choosing a product to use. Whether ingested or used topically, CBD oil is made using a few different processes. To boot, it can even be different colors and contain contaminants, depending on how the cannabis plants used to make it are grown.

As you can imagine, these are all important considerations before making a purchase. Here’s what to know about how CBD oil is made and what to consider when assessing CBD products.