While everyone has their own unique body chemistry, it seems like the vast majority of people can ingest CBD oil without ever feeling any unpleasant side effects at all, and the remaining few will mostly likely experience only minor symptoms like stomach upset or dry mouth. Since scientists are using pure extracts from known sources, it’s likely that some consumer reports of headaches or other minor adverse reactions could be due to impurities in inferior CBD products.
As of May 2017, however, you will find the addition of "Marihuana Extract" in the Texas Register [PDF] (not the Health and Safety Code) by the order [PDF] of the Commissioner of the Department of State Health Services. That order is what the Tarrant County District Attorney is using as a basis to prosecute CBD oil possession cases at the misdemeanor level.
If you go through Chapter 481 of the Health and Safety Code, you will find substances like THC (Tetrahydrocannabinol) and dronabinol (synthetic marijuana). What you won't find in Chapter 481 is "cannabidol." You also won’t find any of the other descriptors of cannabidol found on the Open Chemistry Database maintained by the National Center for Biotechnology Information or in any penalty group in Texas.
Third-Party Testing: Once a CBD oil is manufactured, CBD oil companies will often submit their products for third-party tests, which are conducted by non-company personnel to ensure the product is safe for public consumption and meets quality standards.CBD oils should always be accompanied with information about third-party tests; best practice is to avoid oils that do not supply these details.