A few years ago you had to go looking for CBD. Now it is at the gas station, the coffee shop and the pet store. The claims on the packages are big: better sleep, less anxiety, pain relief, calmer skin, a calmer dog. Some people swear by it. Others try it and feel nothing at all. So what is actually going on?
What CBD is
CBD, short for cannabidiol, is one of more than a hundred compounds found in the cannabis plant. Unlike THC, it does not make you high. Most CBD products sold in stores come from hemp, which is cannabis bred to contain very little THC.
The one use with strong evidence
There is exactly one CBD product approved by the FDA: a prescription medicine called Epidiolex. It treats seizures in a few rare and severe forms of epilepsy, including Lennox-Gastaut syndrome and Dravet syndrome. The doses used in those studies are much higher than what you find in a typical gummy, and patients are monitored by their doctors.
That approval is important because it shows CBD does real things in the body. It does not mean the CBD in your gummies will do the same.
What the research says about common claims
Anxiety
Some small studies suggest CBD may reduce anxiety in specific situations, like public speaking tests in a lab. Larger, longer studies in everyday life are still limited. If you deal with anxiety regularly, CBD is not a substitute for proven treatments.
Sleep
Many people use CBD for sleep, but the evidence is mixed. Some of the benefit people notice may come from feeling less anxious, or from other ingredients such as melatonin that are often added to "sleep" CBD products. Check the label so you know what you are taking. Our article on melatonin covers that ingredient on its own.
Pain
Research on CBD alone for pain in people is limited. Many studies involve products that also contain THC, which makes it hard to know what is doing the work. Topical CBD creams are popular for sore joints, but good evidence that they work better than a plain moisturizing cream is thin.
The National Center for Complementary and Integrative Health keeps an up-to-date summary of what the science says about cannabis and cannabinoids, and it is a good place to check before spending money.
The safety questions people do not hear about
CBD is often sold as completely harmless. It is generally well tolerated, but it is not without risk:
- Liver effects. At high doses, CBD can raise liver enzymes, a sign of stress on the liver.
- Drug interactions. CBD affects enzymes your liver uses to break down many medicines, including some blood thinners, seizure medicines and antidepressants. If you take any prescription medicine, ask your pharmacist before trying CBD.
- Drowsiness and stomach upset are the most common side effects.
- Pregnancy and breastfeeding. The FDA advises against using CBD during pregnancy or while breastfeeding.
You can read the FDA's own position on cannabis and CBD products, including why it has not created a standard pathway for CBD in foods and supplements.
The label problem
This is the part that surprises most people. When researchers have tested CBD products bought online, a large share contained more or less CBD than the label said, and some contained THC that was not listed. That matters if you are drug tested at work, or if you are trying to find a dose that works for you.
How to buy a CBD product you can trust
- Ask for the certificate of analysis (COA). Reputable brands post a lab report for each batch. It should come from an independent lab and show the amount of CBD, the amount of THC, and testing for contaminants such as pesticides and heavy metals.
- Match the batch number on your bottle to the batch on the report.
- Check the CBD per serving, not just the total in the bottle. A bottle with 1,000 mg total might hold 33 mg per dropper.
- Avoid products that claim to treat diseases. The FDA has sent warning letters to companies for exactly this.
- Know the type: isolate (CBD only), broad-spectrum (no THC, other plant compounds) or full-spectrum (small amounts of THC).
Our guides on reading a supplement label and third-party testing apply here too.
The bottom line
CBD is a real compound with one proven medical use and a lot of promising but unproven ones. If you want to try it, buy from a company that publishes independent lab results, start with a low dose, and check with your doctor or pharmacist if you take any medicine. Keep your expectations modest, and pay attention to whether it truly helps you or simply costs you money.