Hempseed oil is manufactured from varieties of Cannabis sativa that do not contain significant amounts of tetrahydrocannabinol (THC), the psychoactive element present in the cannabis plant. This manufacturing process typically includes cleaning the seed to 99.99% before pressing the oil. There is no THC within the hempseed, although trace amounts of THC may be found in hempseed oil when plant matter adheres to the seed surface during manufacturing. The modern production of hempseed oil, particularly in Canada, has successfully lowered THC values since 1998. Regular accredited sampling of THC in Canadian hemp seed oil shows THC levels usually below detection limit of 4 ppm (parts per million, or 4 mg/kg). Legal limit for THC content in foodstuffs in Canada is 10 ppm. Some European countries have limits of 5 ppm or none-detected, some EU countries do not have such limits at all.
Hemp seed oil is a relatively common household ingredient. We most often use it as a cooking substitute for vegetable oil, olive oil, canola oil, etc. Hemp seed oil contains essential omega fatty acids and proteins, which are also beneficial when applied topically to your skin. Because hemp seeds contain the least amount of cannabinoids, we don’t generally use them in the production of hemp oil for therapeutic and medical value.
Prolonged use at high doses has not shown potential for abuse of CBD. In fact, a clinical study published in 2018 found that recreational polydrug users did not show abuse potential with use of CBD. Long-term studies have not evaluated potential changes in hormonal balance or long-term adverse changes in liver function, though prolonged use of CBD enhances metabolism of certain drugs. Stopping CBD oil suddenly has not been associated with withdrawal effects.
The trace amount of THC in CBD oil (<0.3%) is not enough to trigger most drug tests as being positive for THC. You would need to consume about 1000-2000 mg per day of CBD to fail a drug test for THC if the employer is testing to SAMHSA guidelines (Substance Abuse and Mental Health Services Administration). If you are tested regularly and taking high doses of CBD, and you are concerned about the very low risk of a positive drug test for THC associated with using hemp-derived products, you could opt to use purified CBD, which does not contain anything but CBD. Just know that purified CBD doesn’t provide the same spectrum of benefits as CBD oil.