Cannabidiol, better known as CBD, is one of the most researched compounds produced by the hemp plant. Unlike THC, CBD is not intoxicating and does not produce a traditional cannabis “high.”
But what does CBD actually do? How does it interact with the endocannabinoid system? Does sublingual CBD work faster than a capsule? Is CO₂ extraction better than ethanol extraction? And is CBD more effective when paired with terpenes, CBN, CBC or other non-THC ingredients? What are CBD benefits backed by research?
The most honest answer is that CBD research is promising but uneven. Some uses are supported by rigorous clinical trials, while others rely on preliminary studies, laboratory research or consumer experience.
How Does CBD Work?
CBD does not work by strongly activating the CB1 cannabinoid receptor in the way THC does. Instead, it appears to influence several biological systems indirectly.
A comprehensive scientific review by Pisanti and colleagues described CBD as a compound with both cannabinoid-receptor-dependent and receptor-independent actions. The review discussed CBD’s potential influence on neuronal activity, immune signaling, inflammation, cardiovascular function and several non-cannabinoid molecular targets. However, this mechanistic evidence should not be interpreted as proof that over-the-counter CBD treats every condition involving those pathways.[1]
Among the systems CBD may influence are:
- The body’s endocannabinoid system
- Serotonin-related signaling, including the 5-HT1A receptor
- TRPV1 channels involved in temperature and pain signaling
- Adenosine signaling
- Enzymes that create or break down the body’s own endocannabinoids
This broad activity may help explain why researchers are investigating CBD across such a wide range of conditions. It also explains why CBD cannot be reduced to a single receptor or biological effect.
CBD, the Endocannabinoid System and Anandamide
The endocannabinoid system, or ECS, is a signaling network involved in processes such as stress response, sleep, appetite, pain perception, immune activity, memory and emotional regulation.
Its major components include:
- CB1 receptors, found primarily in the brain and nervous system
- CB2 receptors, found largely in immune cells and peripheral tissues
- Endocannabinoids, including anandamide and 2-AG
- Enzymes that produce and break down endocannabinoids
Anandamide is an endocannabinoid naturally produced by the body. Its name comes from ananda, the Sanskrit word associated with bliss or happiness, which is why it is sometimes nicknamed the “bliss molecule.”
CBD does not simply replace anandamide. Laboratory and clinical evidence suggests that CBD may affect the way anandamide is transported, metabolized or maintained in the body.
A 2012 clinical study involving people with schizophrenia found that CBD treatment was associated with increased serum anandamide levels. The increase in anandamide was also associated with improvement in psychotic symptoms. Researchers proposed that CBD may enhance anandamide signaling by reducing its intracellular breakdown.[2]
A later randomized clinical trial produced a more complicated result. In people with cannabis use disorder, 800 milligrams of CBD per day appeared to prevent the reduction in anandamide seen in the placebo group. The 400-milligram dose did not produce the same result, and changes in anandamide were not associated with improvements in anxiety, depression, withdrawal or cannabis use.[3]
The takeaway is not that every CBD product automatically “boosts the bliss molecule.” Rather, CBD may influence anandamide signaling under certain conditions, at certain doses and in specific populations. The relationship is biologically plausible, but it remains under investigation.
What Are the Evidence-Based Benefits of CBD?
Prescription CBD and Seizure Disorders
The strongest human evidence for CBD involves certain rare seizure disorders.
In a randomized, double-blind clinical trial involving patients with Dravet syndrome, pharmaceutical CBD reduced convulsive-seizure frequency more than placebo. Side effects—including diarrhea, fatigue, vomiting, sleepiness and abnormal liver-function tests—were also more common in the CBD group.[4]
This research involved standardized, prescription-strength CBD under medical supervision. It should not be generalized to ordinary retail CBD products or used as a reason to replace prescribed seizure medication.
CBD and Anxiety
CBD has shown encouraging—but still preliminary—results for anxiety.
In a small randomized study, a single 600-milligram dose of CBD reduced anxiety, cognitive impairment and discomfort during a simulated public-speaking test in people with social anxiety disorder.[5]
That study is frequently cited, but it involved only 24 patients with social anxiety, and the dose was much higher than the amount found in many retail products. More large-scale studies are needed to determine which anxiety conditions, doses and treatment schedules are most likely to benefit.
CBD and Sleep
CBD is often marketed for sleep, but the evidence remains mixed.
A large randomized study involving 1,793 adults compared low-dose CBD isolate with CBD formulas containing CBN, CBC or melatonin. Participants in every group reported improved sleep, but adding CBN, CBC or melatonin did not significantly outperform 15 milligrams of CBD isolate. CBD also did not outperform five milligrams of melatonin.[6]
This suggests that some people may find CBD helpful as part of a nighttime routine, but it does not prove that CBD is a universal sleep treatment—or that adding more cannabinoids automatically makes a product more effective.
CBD and Pain
The outcome may depend on the type of pain, delivery method and dose.
A small randomized crossover trial found that a topical CBD preparation improved pain and disability scores in 18 participants with thumb arthritis.[7] However, a larger trial of oral synthetic CBD found no meaningful reduction in pain among people with hand osteoarthritis or psoriatic arthritis.[8]
These differing results show why “CBD helps pain” is too broad a claim. A topical used on a localized joint is not equivalent to swallowing a low-dose capsule for widespread or inflammatory pain.
CBD and Inflammation
Laboratory and animal research suggests that CBD can influence several inflammatory and immune pathways. The 2017 Pisanti review discusses these immunomodulatory mechanisms.[1]
Human clinical evidence is much more limited. CBD should therefore be described as being researched for inflammation—not as a proven treatment for inflammatory disease.
CBD Isolate vs. Broad-Spectrum vs. Full-Spectrum CBD
These terms describe what remains in the final hemp extract.
CBD Isolate
CBD isolate contains highly purified cannabidiol with other cannabinoids and plant compounds largely removed.
Potential advantages:
- No intentional THC
- Predictable CBD content
- Minimal flavor
- Useful for people who want a simple formulation
Potential disadvantages:
- Does not contain the broader range of hemp compounds
- Less representative of the original plant extract
Broad-Spectrum CBD
Broad-spectrum products contain CBD plus selected minor cannabinoids, terpenes or other hemp compounds, with THC removed or reduced to non-detectable levels.
Potential advantages:
- Provides a broader plant profile without intentionally including THC
- May include CBG, CBC, CBN or terpenes
- Appropriate for many customers actively avoiding THC
Potential disadvantages:
- Formulations differ greatly between manufacturers
- “THC-free” should always be confirmed with a recent laboratory report
Full-Spectrum CBD
Full-spectrum extract retains CBD along with other naturally occurring hemp constituents and may contain legally permitted trace amounts of THC.
Potential advantages:
- Maintains a wider range of the plant’s original compounds
- May be preferred by customers seeking a whole-plant extract
Potential disadvantages:
- Trace THC may be undesirable for some customers
- Repeated use could potentially matter for highly sensitive drug testing
- Chemical profiles vary between batches and manufacturers
The terms isolate, broad-spectrum and full-spectrum do not tell you whether a product is accurately labeled, contaminant-free or clinically effective. Always review the certificate of analysis, or COA.
How CBD Is Extracted
Extraction determines which compounds are removed from the hemp plant, but it does not by itself determine whether the finished product will work.
A 2024 comparison found that supercritical CO₂ extraction, ethanol extraction and hydrodistillation produced substantially different cannabinoid and terpene profiles. In the material tested, CO₂ extracted the greatest variety and abundance of cannabinoids, ethanol retained more acidic cannabinoids such as CBDA, and hydrodistillation produced the greatest abundance and variety of terpenes.[9]
Supercritical CO₂ Extraction
Carbon dioxide is placed under carefully controlled pressure and temperature until it behaves as both a liquid and a gas.
Common advantages:
- Highly adjustable
- Effective at extracting cannabinoids
- Leaves no traditional solvent residue
- Widely used for premium hemp extracts
Limitations:
- Expensive equipment
- Terpene retention depends on the exact process
- “CO₂ extracted” does not automatically mean superior
Ethanol Extraction
Food-grade ethanol is used to dissolve cannabinoids and other plant compounds before being removed from the finished extract.
Common advantages:
- Efficient for larger-scale production
- Can capture cannabinoids, chlorophyll and other plant constituents
- Particularly effective at retaining acidic cannabinoids under certain conditions
Limitations:
- Requires careful filtration and solvent removal
- Can produce a stronger plant flavor
- Final quality depends heavily on refinement and testing
Hydrocarbon Extraction
Butane, propane or a combination of hydrocarbons can efficiently extract cannabinoids and terpenes.
Common advantages:
- Efficient extraction
- Can retain aromatic compounds
- Useful for producing concentrated extracts
Limitations:
- Requires specialized equipment and strict safety controls
- Residual-solvent testing is essential
- Less common for everyday CBD wellness oils
Lipid or Oil Infusion
Hemp is infused directly into a carrier oil such as coconut, olive or MCT oil.
Common advantages:
- Simple process
- No volatile solvents
- Appropriate for small-batch herbal preparations
Limitations:
- Usually produces a less concentrated extract
- Shorter shelf life may be possible
- Harder to standardize precisely
The most important questions are not simply “Was this made with CO₂?” or “Is this natural?” Ask whether the finished product has an accurate cannabinoid profile and has been tested for residual solvents, pesticides, heavy metals and microbial contamination.
CBD Intake Methods: Onset, Duration and Efficacy
CBD onset is affected by dose, formulation, food, metabolism, body composition and frequency of use. These ranges are approximate, not guaranteed.
| CBD format | Approximate onset | Approximate duration | Important considerations |
|---|---|---|---|
| Sublingual oil or tincture | 30–120 minutes | 4–6+ hours | Often marketed as faster, but some of the dose is usually swallowed |
| Capsule, softgel or edible | 1–3 hours | 4–8+ hours | Convenient and consistent, but absorption can vary considerably |
| CBD beverage | 30 minutes–2 hours | 3–6 hours | Standard beverages behave more like edibles; nano-emulsified formulas may act faster |
| Nano or water-dispersible CBD | Approximately 15–90 minutes | Formulation-dependent | Some formulations improve absorption, but “nano” is not a guarantee of quality |
| Topical CBD | Approximately 15–60 minutes | 2–6 hours | Intended for localized use; systemic absorption is usually limited or uncertain |
| Transdermal patch | Approximately 1–2 hours | 8–24 hours | Designed for extended delivery; human CBD data remain limited |
| Inhaled CBD | Within minutes | Approximately 2–4 hours | Rapid delivery, but The Other Path does not carry inhaled CBD products |
A small randomized crossover study found that CBD oil used as sublingual drops and the same oil swallowed in capsules produced similar blood concentrations. Both reached peak concentration at approximately four hours. The researchers suggested that much of a “sublingual” CBD dose may ultimately be swallowed rather than absorbed directly through the tissue under the tongue.[10]
A larger pharmacokinetic review found that dose, delivery route, diet and formulation all significantly affected CBD absorption. Nano-formulations generally produced a faster onset, while taking oral CBD with food increased CBD exposure.[11]
Does Taking CBD With Food Help?
CBD is fat-soluble. A controlled pharmacokinetic study of pharmaceutical CBD found that a high-fat meal substantially increased CBD exposure compared with taking it while fasting.[12]
That does not mean everyone should take the largest possible dose with a heavy meal. It means consistency matters. Taking an oral CBD product under similar food conditions each day may produce more predictable results.
Is CBD More Effective When Combined With Other Ingredients?
CBD and Terpenes
Terpenes are aromatic plant compounds found in hemp, lavender, citrus, pine, herbs and many other plants.
A randomized crossover trial tested a THC-free capsule containing 300 milligrams of CBD plus small amounts of eight terpenes in 125 people with insomnia. The formulation produced a modest 1.3-percentage-point increase in combined slow-wave and REM sleep compared with placebo, but it did not increase total sleep time.[13]
This is an encouraging signal, but the study did not include a CBD-only comparison group. It therefore cannot prove that the terpenes made CBD more effective. The specific formulation also contained far more CBD than many retail sleep products.
CBD With CBN or CBC
CBN is frequently promoted for sleep, while CBC is sometimes included in broad-spectrum wellness formulas.
In the 1,793-person sleep study, adding 15 milligrams of CBN—with or without five milligrams of CBC—to 15 milligrams of CBD did not significantly outperform CBD isolate.[6]
This does not mean CBN or CBC have no value. It means that this particular study did not demonstrate greater sleep improvement from those combinations.
CBD and Melatonin
The same study found that CBD-containing combinations did not outperform five milligrams of melatonin. Adding CBD and CBN to melatonin also failed to produce a significant advantage over the comparison formulations.[6]
Combination products may still be convenient, but “more ingredients” does not necessarily mean “more effective.”
CBD and Dietary Fats
Pairing oral CBD with dietary fat has one of the clearest demonstrated effects—but the benefit is pharmacokinetic rather than therapeutic. Fat can increase the amount of CBD reaching the bloodstream.[12]
This may make a dose more bioavailable, but it can also increase the risk of side effects and drug interactions. More absorption is not always better.
CBD With Kava, Kanna or Functional Mushrooms
Products combining CBD with kava, kanna, adaptogens or functional mushrooms may appeal to customers seeking layered wellness support. However, direct human clinical trials testing these specific combinations are currently lacking.
Each ingredient should be evaluated individually. Combining multiple calming products may increase drowsiness or create additional medication interactions. These blends should not be advertised as clinically proven combinations unless research has evaluated the actual formula.
How to Choose a Quality CBD Product
Look for:
- A recent, batch-specific certificate of analysis
- CBD potency that closely matches the label
- Clear THC results
- Testing for pesticides, heavy metals, microbes and residual solvents
- A complete ingredient list
- A clearly stated serving size
- A manufacturer that avoids exaggerated medical claims
Be cautious of products claiming to cure pain, anxiety, insomnia, inflammation, cancer or other medical conditions.
CBD Safety and Drug Interactions
CBD can cause side effects, particularly at higher doses. Reported effects include:
- Drowsiness or fatigue
- Diarrhea
- Appetite changes
- Digestive discomfort
- Changes in liver enzymes
- Interactions with prescription medications
CBD can affect enzymes involved in drug metabolism. This may change the blood concentration of medications such as blood thinners, seizure medicines, sedatives, and certain psychiatric drugs.
The FDA advises consumers to discuss CBD use with a healthcare professional, especially when taking medication. The FDA has also warned that nonprescription CBD products have not been evaluated as treatments in the same way as approved drugs.[14]
People who are pregnant, breastfeeding, preparing for surgery, or managing liver disease should consult a qualified medical professional before using CBD.
The Bottom Line
CBD is a non-intoxicating hemp compound with legitimate scientific interest and a growing body of human research.
The evidence is strongest for prescription CBD used for certain seizure disorders. Research involving anxiety, sleep, localized discomfort, and other wellness goals is promising but still developing. CBD may also influence anandamide and the wider endocannabinoid system, although these effects appear to depend on dose, population, and biological context.
Extraction method, delivery format, and food and product composition can all affect how CBD behaves. However, no extraction method or trendy ingredient can replace accurate labeling, third-party testing and realistic expectations.
At The Other Path, we focus on non-intoxicating wellness products and do not carry THC or inhaled CBD products. Our Wellness Guides can help you compare CBD oils, edibles, capsules, beverages and topicals; understand laboratory reports; and select a format that fits your preferences.
Visit The Other Path at 14084 Ventura Boulevard in Sherman Oaks, California, or explore theotherpathcbd.com.
This article is provided for educational purposes and is not medical advice. CBD products sold as consumer wellness products are not intended to diagnose, treat, cure or prevent disease. Consult a qualified healthcare professional before using CBD, especially if you take medication or have a medical condition.
References
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- Hua DYH, Hindocha C, Baio G, et al. “Effects of Cannabidiol on Anandamide Levels in Individuals With Cannabis Use Disorder: Findings From a Randomised Clinical Trial.” Translational Psychiatry. 2023;13:131. PubMed | Full text
- Devinsky O, Cross JH, Laux L, et al. “Trial of Cannabidiol for Drug-Resistant Seizures in the Dravet Syndrome.” The New England Journal of Medicine. 2017;376:2011–2020. PubMed | DOI
- Bergamaschi MM, Queiroz RHC, Chagas MHN, et al. “Cannabidiol Reduces the Anxiety Induced by Simulated Public Speaking in Treatment-Naïve Social Phobia Patients.” Neuropsychopharmacology. 2011;36:1219–1226. PubMed | Full text
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- Heineman JT, Forster GL, Stephens KL, et al. “A Randomized Controlled Trial of Topical Cannabidiol for the Treatment of Thumb Basal Joint Arthritis.” Journal of Hand Surgery. 2022;47:611–620. PubMed | DOI
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- Chacon FT, Raup-Konsavage WM, Vrana KE, Kellogg JJ. “Effect of Hemp Extraction Procedures on Cannabinoid and Terpenoid Composition.” Plants. 2024;13:2222. PubMed | Full text
- Johnson DA, Funnell MP, Heaney LM, et al. “Cannabidiol Oil Ingested as Sublingual Drops or Within Gelatin Capsules Shows Similar Pharmacokinetic Profiles in Healthy Males.” Cannabis and Cannabinoid Research. 2024;9–e1432. PubMed | DOI
- Moazen-Zadeh E, Chisholm A, Bachi K, Hurd YL. “Pharmacokinetics of Cannabidiol: A Systematic Review and Meta-Regression Analysis.” Cannabis and Cannabinoid Research. 2024;9:939–966. PubMed | Full text
- Crockett J, Critchley D, Tayo B, Berwaerts J, Morrison G. “A Phase 1, Randomized, Pharmacokinetic Trial of the Effect of Different Meal Compositions, Whole Milk, and Alcohol on Cannabidiol Exposure and Safety in Healthy Subjects.” Epilepsia. 2020;61:267–277. PubMed | Full text
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- U.S. Food and Drug Administration. “What You Need to Know About Products Containing Cannabis or Cannabis-Derived Compounds, Including CBD.” FDA consumer guidance
