CBD and Inflammation: What Does the Research Say?

The word "inflammation" seems to be the common thread in many problems, from joint pain to skin redness and from gut trouble to sports injuries. That is why CBD being called "anti-inflammatory" draws attention. In this article, we explain in plain language what inflammation is, why CBD is being studied for it, what has been found in the laboratory and in patients, and topics you can discuss with your doctor.

What is inflammation?

Inflammation is the immune system's natural response to an injury or infection. Immune cells release signaling proteins called cytokines, which increase blood flow to the area and start the repair process; redness, swelling, warmth and pain are signs of this process. Short-term inflammation is part of healing.

The problem arises when inflammation continues even though it is not needed, or when the immune system turns against the body's own tissues. In diseases such as rheumatoid arthritis, Crohn's disease, ulcerative colitis and psoriasis, long-lasting inflammation can damage tissues. Each of these diseases has its own treatments that have been shown to bring inflammation under control.

Why is CBD linked with inflammation?

CBD (cannabidiol) is a substance found in the cannabis plant that, unlike THC, does not make you high or cloud your thinking. Some receptors of the body's endocannabinoid system are found on immune cells. CBD binds only weakly to these receptors; instead, it is thought to act through many other targets.

A review pooling laboratory studies describes how CBD can affect signaling pathways involved in inflammation and the activity of some genes (Burstein 2015). For example, in a laboratory study with human skin cells, CBD reduced the release of inflammatory signals such as MCP-2 and interleukin-6 in cells exposed to an allergic trigger (Petrosino 2018). In rats with induced arthritis, CBD gel rubbed onto the skin reduced joint swelling and pain behaviors (Hammell 2016).

These findings are important clues, but an effect seen in a cell dish or in a rat does not mean the same result will occur in a person with an inflammatory disease. Doses, how the drug enters the body and the complexity of the disease are very different.

What does the research say?

Whether a treatment works in people is best shown by controlled studies, in which participants are assigned to groups by chance and one group receives a product that looks the same but has no active ingredient (placebo). Studies of this kind with CBD in inflammatory diseases are, for now, few and small.

Inflammatory bowel diseases

• Crohn's disease, pure CBD: In a study of 20 patients, 10 mg of pure CBD twice a day was safe but did not change disease activity differently from placebo (Naftali 2017).
• Crohn's disease, CBD-rich oil that also contains THC: In 56 patients, symptoms and quality of life improved; however, endoscopy findings showing inflammation in the gut and blood and stool tests (CRP, calprotectin) did not change (Naftali 2021). So even if patients feel better, the inflammation may still be there.
• Ulcerative colitis: In a study of a CBD-rich plant extract that also contains THC, there was no difference from placebo in disease remission (Irving 2018).

Details are on the Crohn’s and ulcerative colitis page of the CBD Guide.

Joint diseases

In 136 people with hand osteoarthritis and psoriatic arthritis, 20–30 mg of pure CBD a day for 12 weeks did not reduce pain differently from placebo (Vela 2022). We have gathered what is known about rheumatoid arthritis in a separate article.

Skin

In a study of 28 people with psoriasis, 60 mg of CBD oil a day by mouth did not improve the disease severity score clearly differently from placebo; a reduction in itching was seen, however (Roongpisuthipong 2026). A study reporting improvement in 20 people using a CBD ointment had no comparison group (Palmieri 2019). Details are on the skin conditions page.

Inflammation after exercise

Strenuous exercise creates a temporary inflammatory response in the muscles, and this offers a chance to measure CBD's effect directly in people. In a study of 24 well-trained female athletes, CBD did not change blood markers of inflammation, muscle damage or fatigue differently from placebo (Crossland 2022). Another study in trained athletes also found no effect on measures of inflammation (Isenmann 2024).

Possible side effects and drug interactions

• Common side effects: Tiredness, diarrhea, changes in appetite or weight (Iffland 2017).
• Liver: In a 4-week study of healthy adults, liver enzymes rose markedly in 5.6% of those taking 5 mg of CBD per kilogram of body weight a day (Florian 2025).
• Blood pressure: In healthy volunteers, a single dose of CBD lowered blood pressure by a few mmHg (Jadoon 2017); in people taking blood pressure medicine, it may cause dizziness.
• Medicines for inflammatory diseases: CBD can slow down how the body breaks down some medicines; immunosuppressants such as tacrolimus and mycophenolate are among them. You can look up your own medicine on the drug interactions page.

How was it used in studies?

• In Crohn's disease, 10 mg of pure CBD twice a day,
• In the joint study, 20–30 mg of pure CBD a day (12 weeks),
• In psoriasis, 60 mg of CBD oil a day by mouth,
• In the exercise study, 5 mg of CBD per kilogram of body weight, three times, before and after the muscle-straining exercise.

These are study doses, not personal recommendations. None of these doses showed a clear difference from placebo in objective measures of inflammation in people.

If you are thinking about using CBD

Living with an inflammatory disease can be exhausting; it is very natural to be curious about supportive options. You can talk with your doctor about:

• How active your disease is right now and whether your treatment is working well enough.
• All the medicines you take, especially immunosuppressants, biologic drugs, corticosteroids and pain relievers.
• Your liver tests and blood pressure.
• Pregnancy, breastfeeding or plans for pregnancy.

As the bowel study showed, feeling better may not mean the inflammation has gone away; so do not replace your treatment with CBD, and do not reduce or stop it on your own. For general information about the immune system, you can see our article on CBD and the immune system. In Turkey, cannabis-derived products, including CBD, may be sold only in pharmacies (Law No. 7557; regulation of January 31, 2026). Those classed as medicines or health products are dispensed with a prescription; the regulation does not state a prescription requirement for supplement products with a THC content of at most 0.3%. As of October 2026, there is no approved (licensed) CBD medicine in Turkey. For details, see our regulations page.

Conclusion

CBD's effects related to inflammation are seen in the laboratory and in animals, and they deserve researchers' attention. In controlled studies in people, however, no clear difference has so far been found in measures of inflammation. If you have an inflammatory disease, the soundest path is the treatment set up with your doctor; if you are curious about CBD, you can talk about that in the same visit.

Frequently asked questions

References