Medicinal properties of CBD: an overview

Interest in cannabidiol (CBD) has kept growing in recent years, and with it the scientific research into what it is used for. In this article we review, one by one, the medicinal properties of CBD that science studies —indicating what is proven and what is still under research— and its most relevant medical uses.

In short: what scientific research says about CBD

• Epilepsy (the strongest evidence): it is the only application with clinical backing and regulatory approval. CBD is approved for Dravet and Lennox-Gastaut syndromes.
• Anxiety, stress and sleep: promising results, especially with single doses; the mechanism is linked to serotonin 5-HT1A receptors and the endocannabinoid system.
• Chronic, neuropathic and inflammatory pain: most of the positive data come from animal models; the most recent reviews (2025) conclude that CBD alone, without THC, does not outperform placebo for chronic pain.
• Inflammation and oxidative stress: properties observed mainly in preclinical studies.
• Skin, neuroprotection and other uses: potential in early-stage research, pending clinical confirmation.

*Note: this is an informative, educational article that *does not aim to diagnose, treat or prevent any disease*, nor is it a prescriptive recommendation. CBD products, such as *CBD oils, are not medicines or food supplements and are intended for external use. This content does not replace medical advice: if you have symptoms or are undergoing treatment, consult your healthcare professional before using CBD.

What is CBD?

Cannabidiol (CBD) is one of the best-known molecules in hemp (Cannabis sativa) and one of its main cannabinoids. It is obtained mainly from hemp and, unlike other compounds in the plant, does not alter perception or mood. If you want a general overview of the compound, see the complete guide on what CBD is and what it is for.

Its safety profile is backed by the report from the World Health Organization (WHO) on cannabidiol: according to the WHO, CBD is generally well tolerated, shows no potential for abuse or dependence, and is not associated with adverse public-health effects.

Differences between CBD and THC

THC is the cannabinoid responsible for the psychoactive effect of cannabis —the characteristic “high”, with altered perception—. CBD, by contrast, doesn’t get you “high” or alter your mental state, and isn’t addictive either.

Although both compounds, CBD and THC, come from Cannabis sativa and act on the endocannabinoid system, their effects are very different. We cover this in the differences between CBD and THC.

How does CBD work in the body?

CBD barely binds directly to the CB1 and CB2 cannabinoid receptors: it acts more as a modulator of them and through other pathways. Its effect is explained by the combination of several mechanisms:

• Endocannabinoid system: CBD slows the breakdown of anandamide —a molecule that regulates mood, pain and appetite—, prolonging its action. We explain it in detail in the endocannabinoid system.
• Serotonin 5-HT1A receptors: involved in its effect on anxiety and mood.
• TRPV1 channels: related to the regulation of pain, inflammation and body temperature.

This indirect, multi-target action explains why CBD can influence such different processes in the body.

Medicinal properties of CBD

The CBD properties most studied by science are:

• Anxiety, stress and sleep
• Pain relief
• Epilepsy (the strongest evidence)
• CBD and autism (ASD)
• Neuroprotection and antioxidant action
• Anti-inflammatory properties
• Skin properties
• Antitumour potential (preclinical)

Anxiety, stress and sleep

Anxiety disorders are highly prevalent and conventional treatments are not always effective or free of side effects. This is where CBD draws interest: through its effect on serotonin 5-HT1A receptors and the endocannabinoid system, it could help regulate fear and anxiety (1, 2).

The most recent data are encouraging but cautious: a 2024 meta-analysis found a significant improvement in anxiety with CBD, albeit on small, heterogeneous samples (3), and reviews of clinical trials describe often contradictory results based mostly on single doses (4). For now, CBD is not approved as a treatment for anxiety. We go deeper into how to use CBD for anxiety and CBD for stress.

Many people turn to CBD seeking better rest: thanks to its relaxing effect, its role in sleep is also being researched. We look at it in the CBD for sleep guide.

Analgesic properties: pain relief

Various studies have explored whether CBD can help reduce pain, both on its own and combined with other medications. CBD's efficacy varies depending on the amount used and its route of administration (5).

Animal studies have found that CBD can relieve several types of pain, including neuropathic pain caused by diabetes, pain caused by arthritis and general pain related to inflammation (6-9). These findings suggest CBD could be useful in the treatment of chronic pain conditions.

CBD's pain-relief properties have also been studied in people, in clinical settings such as neuropathic and arthritis pain. It is worth noting, however, that the most recent and rigorous reviews conclude that CBD on its own (without THC) is not associated with pain improvement versus placebo, so the evidence in humans remains limited (10). We explain the mechanisms of action and the CBD dosage for pain in our dedicated guide.

Epilepsy: the strongest evidence

This is the application with the strongest scientific backing: clinical trials have shown that CBD significantly reduces seizure frequency in patients with Dravet syndrome and Lennox-Gastaut syndrome, to the point that a purified CBD drug is approved by the FDA and the EMA for these epilepsies (11, 12).

However, this does not mean CBD is beneficial for all types of epilepsy, so its use cannot be generalised. Its efficacy in other forms —such as focal epilepsies, or in adults as monotherapy or add-on therapy— is still under research. More on CBD for epilepsy in its article.

CBD and autism (ASD)

Autism is one of the cases that draws the most interest. CBD is being researched as a possible support for some symptoms associated with Autism Spectrum Disorder —anxiety, irritability or sleep problems—, although it is not an approved medicine for ASD. Most trials do not use pure CBD, but very high ratios of CBD with a minimal amount of THC (20:1 ratio), and they agree on avoiding THC in high doses, especially in minors, due to the greater risk of psychosis (13, 14). The evidence is promising but preliminary and its use should always be guided by a specialist. We go into more detail in CBD and autism.

Neuroprotective and antioxidant properties

CBD has shown potential to protect brain cells. This effect, known as neuroprotection, is because CBD can counteract the damage caused by oxidative stress, similar to how the antioxidants in foods such as blueberries protect our cells; moreover, these benefits occur without interacting with the receptors typically associated with cannabinoids (15).

In animal research, CBD has been observed to reduce brain damage in newborns following certain injuries and to lessen brain inflammation (16). In preclinical models it also attenuates markers associated with Alzheimer's disease (17) and, in cancer patients receiving chemotherapy, some studies suggest it could help prevent or reduce the nerve damage associated with treatment (18).

We explain this property in detail in CBD as a neuroprotectant.

Anti-inflammatory properties

CBD has anti-inflammatory properties that would help maintain a stable environment inside cells, especially regarding calcium levels in immune cells. This regulation occurs mainly through TRP channels, which help control the release of cytokines, proteins that can cause inflammation (19).

This anti-inflammatory action is one of the most sought-after in topical and wellness CBD oils. We expand on how to make the most of it in the article on CBD as an anti-inflammatory.

CBD properties for the skin

CBD has beneficial effects on the skin, which makes it useful for addressing various conditions such as dermatitis and eczema, psoriasis, acne and even melanoma, thereby improving patients' quality of life (20). However, CBD is a hydrophobic compound, which makes its direct application to the skin difficult; to overcome this, formulations such as gels and nanosystems have been developed to improve its penetration.

Despite its potential, much remains to be understood about the precise mechanisms, effective doses and safety of CBD for the skin; research continues (21). You will find more information in the benefits of CBD for the skin.

Antitumour properties (preclinical research)

Preclinical studies have suggested that CBD could enhance the effects of some drugs against certain types of cancer, such as squamous cell carcinoma. Although several research groups are still studying how it acts against tumour cells, in these models it appears to trigger a process leading to their death (22). This is a very early line of research: we review the available evidence in the article on CBD in cancer treatment.

Other CBD properties under research

Besides the above, the scientific literature explores other possible applications of CBD, all still in preliminary stages:

• Fibromyalgia: it is being researched as support for chronic pain and quality of life; clinical evidence is limited and suggests that formulas with some THC (full spectrum) could be more useful than CBD alone. More in CBD and fibromyalgia.
• Mood and depression: thanks to its action on serotonin, its potential against depression is being researched.
• Multiple sclerosis: its role in spasticity and neuroinflammation is being studied; we review it in cannabis and CBD in multiple sclerosis.
• Autoimmune diseases: for its immunomodulatory effects. More in cannabis and CBD in autoimmune diseases.
• Nausea and vomiting: its antiemetic action is being researched, especially in the context of chemotherapy.

It is worth remembering that these lines of research are mostly preclinical or preliminary and do not constitute medical indications.

Frequently asked questions about CBD's properties

Which CBD properties are best backed by science?

The strongest evidence is antiepileptic: purified CBD is approved to treat severe epilepsies such as Dravet and Lennox-Gastaut syndromes. The other properties (pain, anxiety, inflammation, skin and neuroprotection) have promising results, mostly in preclinical studies and human trials that are still limited.

Does CBD have side effects?

CBD is usually well tolerated, but it can cause mild effects such as drowsiness, dry mouth or changes in appetite. You can check the side effects of CBD and who should not take it before starting.

Does CBD interact with other medications?

Yes. CBD can change the metabolism of some drugs via the liver. If you are undergoing treatment, review the possible interactions between CBD and medications and discuss it with your doctor.

What is CBD used for?

CBD is studied for its possible role in pain, anxiety, inflammation and skin, and it has clinical evidence in certain epilepsies. In practice, most people use it for general wellbeing; you can see how CBD is taken and its different formats.

Does CBD show up on a drug test?

CBD itself is not screened for in drug tests, which detect THC. Even so, it is best to choose products with THC within the legal limit. We clarify this in does CBD show up on a drug test?.

Is CBD legal in Spain?

CBD is not a narcotic substance, but its sale in Spain is limited to external use (cosmetic, aromatic). Products must comply with the EU legal THC limit.

Conclusion

CBD is a non-psychoactive and generally well-tolerated compound whose therapeutic potential is still being researched. For now, the strongest clinical evidence is in epilepsy; for the other properties the studies are promising but, for the most part, preliminary or preclinical. As research advances, we will better understand how it could complement conventional therapies.

*Note: this is an informative article and is not intended to prevent, diagnose or treat any disease, nor is it a prescriptive recommendation. The doses, ratios or guidelines mentioned reflect published scientific research and clinical experience, and *are not a regimen to follow on your own*. This content may complement, but never replace, the diagnosis or treatment of a professional. Cannactiva products are not medicines and are intended for external use. New scientific evidence may have emerged since the publication date. Always consult your doctor before using CBD; the therapeutic approach must be personalised.*