What is CBD oil and is it safe to use?
What is CBD oil, is it legal in the UK and what are the benefits and risks of using it? We asked a dietitian to take a closer look at this food supplement.
CBD oil is increasingly popular, both as a food supplement and as an oil to apply topically to the skin. We asked dietitian Emer Delaney to explain what it is, why people use it and whether it’s safe.
What is CBD oil?
Cannabidiol (CBD) is a cannabinoid – a chemical compound that acts throughout the body, including on certain parts of the brain, and is becoming increasingly popular in the health world. It comes from the cannabis plant; however, unlike its counterpart, tetrahydrocannabinol (THC), which is responsible for the ‘high’ from marijuana, CBD, derived from the hemp plant, is non-intoxicating and some believe it may have potential health and wellness benefits. Once extracted from the cannabis plant, it is diluted with a carrier such as olive or coconut oil – this improves its bio-availability.
Is CBD oil legal in the UK?
Contrary to popular belief, CBD oil is legal in the UK as it is not a controlled substance. There are, however, strict restrictions over its THC content. CBD oil that isn’t medically prescribed can only have a maximum THC content of 0.2%. CBD oil products that have a higher THC content may be available to buy online, but not legally
A small number of patients in the UK may be prescribed a cannabis-based medicine to treat epilepsy or nausea during chemotherapy. Visit the NHS website for more information on medical cannabis.
It’s worth noting that there are no CBD products authorised for use in animals in the UK. If you are considering CBD oil for your pet, only a vet can prescribe a legal human CBD product.
What is CBD oil used for?
Supporters of CBD oil believe it may help a number of clinical conditions, including refractory epilepsy, chronic pain, depression, anxiety and acne. However, further robust evidence is required as much of the research is carried out on animal models.
A systematic review looking at the use of CBD for epilepsy concluded that there is insufficient evidence to support the efficacy and long-term safety of using it to treat epilepsy. It does, however, suggest that, albeit in very low numbers, small daily doses were safe in a small group of adults for a short period of time.
There are some suggestions from animal studies that CBD may be beneficial for osteoarthritis, through topical application for inflammation or joint pain, however, it has been difficult to attribute the therapeutic benefits to CBT alone.
One study reported reduced pain and muscle spasms in people with multiple sclerosis.
Early evidence looking into the use of CBD in the treatment of anxiety and depression has found some exciting results – although on very small samples. The first study assessed anxiety links with public speaking; it found a very specific dose of CBD (300mg) showed anti-anxiety effects. The second study was a stand-alone case report of one child with post-traumatic stress disorder (PTSD). It found CBD oil helped the child safely reduce her anxiety and improve sleep.
CBD may also have the potential to help reduce acne; however, it is important to note that this research is still in its infancy.
For all the above uses, more human studies are needed before conclusive results may be drawn.
Can I buy CBD oil safely?
Most large health food stores will stock ‘pure’ CBD oil. However, as it is classed as a ‘food supplement’ rather than a ‘medicinal product’, it isn’t regulated in the UK. This means you cannot know for sure that the product you buy contains the ‘active’ ingredients at the amounts listed on the label. Furthermore, the product may contain contaminants such as pesticides, heavy metals and other elements. For this reason, the NHS highlights there is no guarantee that these products will be of good quality or provide the intended health benefits.
Is CBD oil safe for everyone?
If you’re considering using CBD oil, you should speak to your GP or other healthcare professional to ensure that it is safe and appropriate for you to do so.
This is particularly important if you are experiencing any concerning symptoms, if you have any pre-existing conditions or if you are taking any medication including statins, blood-thinning medication and calcium channel blockers.
Although the use of CBD is controversial, it does seem to be tolerated by most people. It has, however, caused hypotension and light-headedness in a small number of patients. As it does not contain the THC part of the cannabis plant, the oil will not induce a ‘high’.
CBD oil should not be used by pregnant or breastfeeding women.
This article was reviewed on 21 March 2022 by Kerry Torrens.
Kerry Torrens BSc. (Hons) PgCert MBANT is a registered nutritionist with a post-graduate diploma in Personalised Nutrition & Nutritional Therapy. She is a member of the British Association for Nutrition and Lifestyle Medicine (BANT) and a member of the Guild of Food Writers. Over the last 15 years she has been a contributing author to a number of nutritional and cookery publications including BBC Good Food.
All health content on bbcgoodfood.com is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. If you have any concerns about your general health, you should contact your local health care provider. See our website terms and conditions for more information.
Have you tried CBD oil and if so, did you find it beneficial? Let us know in the comments below.
What Is CBD Oil?
This cannabis extract may help treat nerve pain, anxiety, and epilepsy
Cathy Wong is a nutritionist and wellness expert. Her work is regularly featured in media such as First For Women, Woman’s World, and Natural Health.
Verywell Health articles are reviewed by board-certified physicians and healthcare professionals. These medical reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more.
Meredith Bull, ND, is a licensed naturopathic doctor with a private practice in Los Angeles, California.
Cannabidiol (CBD) oil is an extract from hemp plants called Cannabis indica and Cannabis sativa . You might be more familiar with cannabis plants because they are grown for marijuana. However, CBD is not the same thing as marijuana.
CBD oil contains CBD that’s mixed with a base (carrier) oil, like coconut oil or hemp seed oil. These are called tinctures. You can get tinctures in different concentrations. The oil can also be put into capsules, gummies, and sprays.
People who support using CBD oil say that it can treat pain and anxiety; can help stimulate appetite and may help manage some types of seizures.
This article goes over what CBD is used for, the possible side effects, and what you should look for if you choose to buy CBD.
CBD vs. Marijuana
CBD is one component (called a cannabinoid ) that’s found in a hemp plant. Marijuana is a separate plant but it’s from the same species that hemp belongs to. Marijuana has CBD and hundreds of other compounds in it.
The main difference between hemp plants and marijuana plants is how much of a compound called tetrahydrocannabinol (THC) is in them. Hemp is grown to have less than 0.3% THC, while marijuana has more.
THC is what’s responsible for the psychoactive effects of cannabis—in other words, it’s what makes you feel “high.”
CBD oil generally does not have THC in it; however, a very small (trace) amount might be in products sold in certain states.
What Is CBD Oil Used For?
We’re not sure exactly how CBD works. Unlike THC, CBD doesn’t have a strong connection with the molecules in the brain that THC binds to create psychoactive effects. These are called cannabinoid receptors.
Instead, CBD works on other receptors, like the opioid receptors that help control pain. It also affects glycine receptors that control a brain chemical called serotonin which helps control your mood.
People that support the use of CBD claim that CBD oil can treat a variety of health problems, including:
- Chronic pain
- Drug use and withdrawal
- High blood pressure
- Muscle spasms
- Poor appetite
As CBD has gained popularity, researchers have been trying to study it more. Still, there has not been a lot of clinical research to look for evidence in support of these health claims.
CBD is not a safe option for everyone. Talk to your healthcare provider if you want to try it for managing a health condition.
A 2015 review of research that was published in the journal Neurotherapeutics suggested that CBD might help treat anxiety disorders.
The study authors reported that CBD had previously shown powerful anxiety-relieving effects in animal research—and the results were kind of surprising.
In most of the studies, lower doses of CBD (10 milligrams per kilogram, mg/kg, or less) improved some symptoms of anxiety, while higher doses (100 mg/kg or more) had almost no effect.
The way that CBD acts in the brain could explain why this happens. In low doses, CBD might act the same as the surrounding molecules that normally bind to the receptor that “turns up” their signaling.
However, at higher doses, too much activity at this receptor site could produce the opposite effect.
There have not been many trials to look at CBD’s anxiety-relieving effects in humans. However, one was a 2019 study published in the Brazilian Journal of Psychiatry.
For the study, 57 men took either CBD oil or a sugar pill with no CBD in it (placebo) before a public-speaking event.
The researchers assessed the participants’ anxiety levels using measures like blood pressure and heart rate. The researchers also used a reliable test for mood states called the Visual Analog Mood Scale (VAMS).
The men who took 300 mg of CBD oil reported less anxiety than the men who were given a placebo; however, the men who took 100 mg or 600 mg of CBD oil did not experience the same effects.
CBD oil might help people with substance use disorder, according to a 2015 review published in the journal Substance Abuse.
The review looked at the findings from 14 published studies. Nine of the studies looked at the effects of CBD on animals, and five studies looked at the effects on humans.
The researchers reported that CBD showed promise for treating people with opioid, cocaine, or psychostimulant use disorders.
However, the effects of CBD were quite different depending on the substance. For example, CBD without THC did not decrease withdrawal symptoms related to opioid use.
On the other hand, it did reduce drug-seeking behaviors in people using cocaine, methamphetamine, and other similar drugs.
Some experts suggest that CBD could help treat cannabis and nicotine dependence, but more research is needed to provide this theory.
High Blood Pressure
A 2017 study found that CBD oil may reduce the risk of heart disease because it can lower high blood pressure in some people.
For the study, nine healthy men took either 600 mg of CBD or the same dose of a placebo. The men who took CBD had lower blood pressure before and after experiencing stressors like exercise or extreme cold.
The study also looked at the amount of blood remaining in the heart after a heartbeat (stroke volume).
The stroke volume in the men who took CBD was lower than in was in the placebo group, meaning their hearts were pumping more efficiently.
The study suggested that CBD oil could be a complementary therapy for people with high blood pressure that is affected by stress and anxiety.
However, there is no evidence that CBD oil can treat high blood pressure on its own or prevent it in people at risk. While stress can complicate high blood pressure, it does not cause it.
In June 2018, the U.S. Food and Drug Administration (FDA) approved a CBD oral solution called Epidiolex.
Epidiolex is used to treat two rare forms of epilepsy in children under the age of 2: Dravet syndrome and Lennox-Gastaut syndrome. These are very rare genetic disorders that cause lifelong seizures starting in the first year of life.
Other than for these two disorders, CBD’s effectiveness for treating seizures is not known. Even with Epidiolex, it’s not clear if the anti-seizure effects are from CBD or another factor.
However, there is some evidence that CBD interacts with seizure medicines like Onfi (clobazam) and raises their concentration in the blood. That said, more research is needed to understand the link.
Possible Side Effects
Clinical research has shown that CBD oil can cause side effects. The specific side effects a person has and how bad they are varies from one person to the next and from one type of CBD to another.
Some common side effects people report from using CBD include:
- Changes in appetite
- Changes in mood
- Dry mouth
CBD oil may also increase liver enzymes, which is a marker of liver inflammation.
People with liver disease should talk to their healthcare provider before taking CBD oil. They may need to have their liver enzymes checked regularly if they are using CBD.
Can You Use CBD If You’re Pregnant?
You should not use CBD oil if you’re pregnant or breastfeeding. Even though the effects of CBD are not fully understood, it does pass through the placenta.
The American Academy of Pediatrics (AAP) further states that pregnant people should not use marijuana because of the potential risks to a developing fetus.
Do not drive or use heavy machinery when taking CBD oil—especially when you first start using it or switch to a new brand. Remember that some products do contain THC, even in small amounts.
CBD oil can interact with medications, including many that are used to treat epilepsy. One of the reasons for this has to do with how your body breaks down (metabolizes) drugs.
Cytochrome P450 (CYP450) is an enzyme your body uses to break down some drugs. CBD oil can block CYP450. That means that taking CBD oil with these drugs could make them have a stronger effect than you need or make them not work at all.
Drugs that could potentially interact with CBD include:
- Anti-arrhythmia drugs like quinidine
- Anticonvulsants like Tegretol (carbamazepine) and Trileptal (oxcarbazepine)
- Antifungal drugs like Nizoral (ketoconazole) and Vfend (voriconazole)
- Antipsychotic drugs like Orap (pimozide)
- Atypical antidepressants like Remeron (mirtazapine)
- Benzodiazepine sedatives like Klonopin (clonazepam) and Halcion (triazolam)
- Immune-suppressive drugs like Sandimmune (cyclosporine)
- Macrolide antibiotics like clarithromycin and telithromycin
- Migraine medicine like Ergomar (ergotamine)
- Opioid painkillers like Duragesic (fentanyl) and alfentanil
- Rifampin-based drugs used to treat tuberculosis
Always tell your healthcare provider and pharmacist about all the medicines you take, including prescription, over-the-counter (OTC), herbal, or recreational drugs.
The interactions between these medications and CBD are often mild and you might not have to change your treatment.
However, in some cases, you might have to change medications or space out your doses to avoid a reaction. That said, never change or stop medication without talking to your provider.
Dosage and Preparation
There are no guidelines for using CBD oil. Each product works a bit differently, depending on the form.
For example, putting the oil under your tongue can produce effects more quickly than swallowing a capsule that needs to be digested.
Here are a few ways that you can take CBD oil:
- Placing one or more drops under your tongue and holding it there for 30 to 60 seconds without swallowing. You can also use a spray that is spritz in your mouth/under your tongue.
- Taking a capsule or chewing a gummy
There’s no “correct” dose of CBD oil. How much you take and the form you choose will depend on your needs and what you hope to get for effects. The average dose range is from 5 mg to 25 mg.
Most oils come in 30-milliliter (mL) bottles and include a dropper cap to help you measure.
That said, it’s hard to figure out the exact amount of CBD per milliliter of oil. Some tinctures have concentrations of 1,500 mg per 30 mL, while others have 3,000 mg per mL or more.
How to Calculate CBD Dose
To determine an exact dose of CBD, remember that each drop of oil equals 0.05 mL of fluid. This means that a 30-mL bottle of CBD oil will have about 600 drops in it.
If the concentration of the tincture is 1,500 mg per mL, one drop would have 2.5 mg of CBD in it. The math to figure that out looks like this: 1,500 mg ÷ 600 drops = 2.5 mg
What to Look For
CBD oil comes in different forms: isolates, broad-spectrum, and full-spectrum.
- Isolates contain only CBD
- Broad-spectrum oils nearly all of the components of the plan (e.g., proteins, flavonoids, terpenes, and chlorophyll), but does not have THC oils have all the compounds including THC (up to 0.3%)
Alternative medicine practitioners believe that the compounds provide more health benefits, but the is a lack of evidence to support these claims.
Remember that CBD oils are unregulated. There’s no guarantee that a product is what it claims to be on its packaging. You also can’t know for sure that it’s safe and effective.
A 2017 study reported that only 31% of CBD products sold online were correctly labeled. Most had less CBD in them than was advertised, and 21% had significant amounts of THC.
If you are interested in buying CBD products, here are a few tips to keep in mind:
- Buy American: Domestically produced CBD oil might be a safer option than those that have been imported.
- Go organic: Brands certified organic by the U.S. Department of Agriculture (USDA) are less likely to expose you to pesticides and other harmful chemicals.
- Read the product label: Even if you choose a full-spectrum oil, don’t assume that every ingredient on the product label is natural. CBD products can also have preservatives, flavorings, or thinning agents in them. If you don’t recognize an ingredient, ask the dispenser what it is or check online.
Hemp plants can be grown for different purposes. Some species are made for marijuana but others are used to make CBD products.
Unlike marijuana, CBD oil does not “get you high.” Instead, it may help relieve stress, anxiety, drug withdrawals, and nerve pain.
While there are many claims about the health benefits of using CBD oil, the evidence is lacking. A lot of studies were done with animals, not humans.
If you want to try CBD oil, you should learn about the different dosages and preparations first.
You should also know that the products are not regulated, which means you can’t know for sure that a product will work and be safe.
Before you use CBD oil, talk to your provider. If you take certain medications or have a health condition, you may not be able to use these products.
Frequently Asked Questions
It would be hard to overdose on CBD oil. Research has shown that human tolerance for CBD is very high. One study reported the toxic dose would be about 20,000 mg taken at one time.
It depends on where you live, the type of product, how it was sourced (e.g., is it from hemp or marijuana), and its intended purpose (medical or recreational). In many states, you must be 18 or 21 to buy CBD oil. Check your state’s laws.
Not necessarily. While the names are sometimes used interchangeably, hemp oil can also refer to hemp seed oil, which is used for cooking, food production, and skincare products.
CBD oil is made from the leaves, stems, buds, and flowers of the Cannabis indica or Cannabis sativa plant. It should contain less than 0.3% THC.
Hemp oil is made from the seeds of Cannabis sativa and does not have TCH in it.