Last updated: October 2026
There are no clinical trials of CBD for PMS or ordinary period pain, so we can’t say it works. Interest comes from surveys of people with endometriosis, mostly using cannabis with THC, and from people who use CBD to unwind in the days before a period. If you try it, start low and keep a diary.
Below: what the evidence actually is, how people use CBD around their cycle, timing and dose, combining it with magnesium, safety, and what the NHS recommends for period pain and PMS.
What the evidence shows
| Type of evidence | What it found | What it means |
|---|---|---|
| Trials of CBD for PMS or period pain | None published | No proof either way |
| Surveys of people with endometriosis | Many report less pain with cannabis, mostly inhaled and containing THC | Self-reported, not controlled, and not about CBD supplements |
| Reviews (2025) | Call for proper trials; no high-quality evidence yet | Promising area of research, nothing proven |
| Lab and animal studies | The endocannabinoid system is involved in pain and the reproductive system | Explains the interest, not evidence in people |
So anyone telling you CBD “stops cramps” or “balances hormones” is going beyond the evidence.
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View productHow people use CBD around their period
- As part of an evening routine in the week before a period, when sleep and mood often dip. See CBD for sleep.
- A balm massaged into the lower tummy or back, often with a hot water bottle. Heat is known to help; whether CBD adds anything isn’t known. See CBD balm.
- Alongside a warm drink or bath as a wind-down ritual.
Timing and dose
- When: many people start a few days before their period is due and continue for the first couple of days, usually in the evening.
- How much: start around 10mg a day. 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.
- Track it: note symptoms for two or three cycles, with and without CBD, to see if it makes a difference for you.
See how much CBD to take.
CBD with magnesium
Magnesium has a little more research for PMS than CBD: small trials found it eased bloating and fluid retention after two cycles. Magnesium contributes to electrolyte balance, normal muscle function and the reduction of tiredness and fatigue. There’s no known problem combining it with CBD. See magnesium for PMS.
Safety and who should avoid it
- Pregnancy, trying to conceive and breastfeeding: the FSA advises against CBD.
- Medicines: CBD can interact with some, including some antidepressants used for PMDD. Ask your pharmacist. See can CBD interact with medication?
- Hormonal contraception: there’s no good evidence that CBD affects it, but tell your pharmacist if you take both.
- Side effects: tiredness, dry mouth and, at higher doses, diarrhoea. See CBD side effects.
What helps period pain and PMS (NHS)
| Period pain | PMS |
|---|---|
| Ibuprofen or paracetamol | Regular exercise |
| Heat: a hot water bottle or warm bath | Smaller, regular meals; less salt, caffeine and alcohol |
| Gentle exercise, such as walking or swimming | Good sleep and stress management |
| Relaxing activities, such as yoga or pilates | Tracking symptoms for two or three cycles |
| Stopping smoking | Talking to a GP about treatments if it affects daily life |
When to see a GP
See a GP if period pain stops you doing everyday things, painkillers don’t help, your periods change or become much heavier, or you have pain during sex or between periods. These can be signs of endometriosis, fibroids or other conditions that need proper treatment. See a GP too if PMS brings very low mood or thoughts of self-harm, which could be PMDD. See also CBD and endometriosis.
Related guides
- See PMS symptoms: the full list.
- CBD and arousal: what the research shows.
- What PMDD is and how it is treated.
- For non-supplement steps that help sleep in the days before a period, see insomnia before your period.
- For drug-free and pharmacy options with the strongest evidence, see our guide to period pain relief.
- How to get tested for endometriosis in the UK.
Sources 5
- NHS. Period pain.
- NHS. PMS (premenstrual syndrome).
- McLaren K et al. A scoping systematic review of cannabis use in endometriosis. Aust N Z J Obstet Gynaecol, 2026.
- Armour M et al. Should cannabis be used in the management of endometriosis? Expert Rev Endocrinol Metab, 2025.
- GOV.UK. FSA consumer advice on CBD.
