Last updated: October 2026
There’s no good evidence that you build a tolerance to CBD. Animal studies found no tolerance after repeated doses, and in long-term medical use CBD’s effects held steady for over a year. Unlike THC, CBD doesn’t strongly activate the brain’s CB1 receptors. If CBD seems to stop working, the usual causes are dose, timing, product quality or expectations.
This guide explains what the research shows, how CBD differs from THC, whether “reverse tolerance” is real, and a step-by-step fix if your CBD feels less effective.
What is tolerance?
Tolerance is when your body adapts to a substance so that the same amount has less effect, and you need more to get the same result. It often happens because receptors in the body become less sensitive or fewer in number. Caffeine, alcohol, some sleeping tablets and THC are well-known examples. Tolerance is different from dependence, where stopping causes withdrawal symptoms, although the two often go together.
Can you build a tolerance to CBD?
The evidence says it’s unlikely. THC causes tolerance by switching on the brain’s CB1 receptors over and over, which makes the brain reduce them. CBD doesn’t activate CB1 receptors in the same way. It works more indirectly, for example by slowing the breakdown of anandamide, one of the body’s own cannabinoids, and by acting on other targets such as serotonin receptors. That’s why it isn’t expected to wear down receptors the way THC does.
Research on everyday low doses over many years is still limited, so “no evidence of tolerance” is more accurate than “impossible”. But what we have is reassuring.
What the research shows
| Study | What it found |
|---|---|
| Hayakawa, 2007 (mice, 14 days) | Repeated THC led to tolerance and reduced CB1 receptors; repeated CBD did not lose its effect |
| Scheffer, 2021 (315 patients, median 444 days) | In long-term medical use of prescription CBD, its benefits were sustained over time |
| Taylor, 2020 (30 healthy adults) | After 4 weeks of high-dose CBD, stopping suddenly caused no withdrawal symptoms |
| World Health Organization, 2018 | In humans, CBD shows no effects indicative of abuse or dependence potential |
The medical studies used much higher doses than food supplements, so they don’t tell us everything about everyday use. But if tolerance were a strong effect, it would show up most clearly at high doses.
CBD tolerance vs THC tolerance
| CBD | THC | |
|---|---|---|
| Activates CB1 receptors? | Not directly | Yes, strongly |
| Tolerance with regular use | No good evidence | Yes, well documented |
| Withdrawal when stopping | None found in trials | Common in heavy users: irritability, poor sleep, cravings |
| Recovery after stopping | Not applicable | Brain scans show CB1 receptors recover over about 4 weeks |
| UK legal status | Legal as a food supplement | Controlled drug |
This is one more reason to choose a THC-free broad spectrum product. Read more in CBD vs THC and full spectrum vs broad spectrum.
Is “reverse tolerance” real?
You’ll read online that CBD causes “reverse tolerance”, meaning you need less over time. Some long-term users do say they can lower their dose and still feel the same. But there’s no good research proving reverse tolerance happens. More likely explanations are that people settle into a steady routine, their sleep or stress improves for other reasons, or they simply find the right dose. It’s a nice idea, but we’d treat it as unproven.
Why CBD might seem to stop working
| Possible cause | What to try |
|---|---|
| Different batch or product | Check the lab report for your batch; CBD content can vary between brands and batches. See how to read a lab report |
| Taking it on an empty stomach | Take it with food containing some fat, which can raise absorption around fourfold. See CBD oil vs capsules |
| Inconsistent use | Take it at the same time each day |
| Dose too low, or too high | Adjust slowly; in one study a middle dose worked best and the highest didn’t. See CBD dosage |
| Wrong time of day | Match timing to your goal. See when to take CBD oil |
| Life has changed | More stress, less sleep or more caffeine can outweigh any supplement |
| Old or badly stored oil | Check the best-before date; store away from heat and light |
| Expectations | CBD’s effects are subtle; keep a short diary to spot real changes |
More in why isn’t CBD working for me?
Do you need a CBD tolerance break?
There’s no evidence you need one. But a short break of a week or two is harmless, and can be a useful way to check how much CBD is helping you. If you notice little difference when you stop, you might not need it, or a different product or dose might suit you better. If you take CBD for sleep, try a break when you have a relaxed week rather than a busy one.
If you increase your dose, do it slowly. The FSA’s 10mg a day figure is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication.
Is CBD addictive? Can it cause withdrawal?
The World Health Organization’s 2018 review found no evidence that CBD has abuse or dependence potential in humans, and a controlled trial found no withdrawal symptoms when people stopped high doses suddenly. The risk comes from products containing THC, which is why lab-tested, THC-free CBD matters. Read more in is CBD addictive? and CBD side effects.
FAQs
Can you build a tolerance to CBD?
There’s no good evidence you can. Animal studies found no tolerance with repeated CBD, and long-term medical use showed effects held steady for over a year.
Does CBD oil stop working over time?
Not usually. If it seems to, check the product’s lab report, take it with food, keep timing consistent, and review your dose before assuming tolerance.
Do I need to increase my CBD dose over time?
Most people don’t. If you do increase it, go up slowly in small steps and check with a pharmacist if you take medication.
Is it OK to take CBD every day?
Yes, most people take it daily. Stick to sensible amounts, buy lab-tested THC-free products and check with your GP if you take regular medication.
Should I take a break from CBD?
You don’t need to, but a short break is harmless and can help you see how much it’s helping.
Does CBD cause withdrawal?
No withdrawal was found in a controlled trial where healthy adults stopped high-dose CBD suddenly after four weeks.
Is CBD tolerance the same as THC tolerance?
No. THC causes tolerance by repeatedly activating CB1 receptors. CBD doesn’t activate them in the same way and hasn’t been shown to cause tolerance.
Sources
- Hayakawa K et al (2007). Repeated treatment with cannabidiol but not delta9-tetrahydrocannabinol has a neuroprotective effect without the development of tolerance. Neuropharmacology.
- Scheffer IE et al (2021). Add-on cannabidiol in patients with Dravet syndrome: results of a long-term open-label extension trial. Epilepsia.
- Taylor L et al (2020). Abrupt withdrawal of cannabidiol (CBD): a randomized trial. Epilepsy and Behavior.
- Hirvonen J et al (2012). Reversible and regionally selective downregulation of brain cannabinoid CB1 receptors in chronic daily cannabis smokers. Molecular Psychiatry.
- World Health Organization (2018). Cannabidiol (CBD) critical review report.
This guide is general information, not medical advice.
