Chamomile Oil for Menstrual Cramps: What the Trials Tested

For period pain, heat has a much larger body of trials behind it than any essential oil, and we found no trial of chamomile essential oil on menstrual pain at all. The chamomile studies that do exist used capsules or a drink. This guide lays out what each type of trial actually tested, so you can see what applies to a bottle of oil and what does not.

Roman Chamomile Essential Oil bottle

Roman Chamomile Essential Oil

Our own Roman Chamomile Essential Oil, in sizes from 0.5 oz to bulk.

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What was tested, in one table

StudyWhat was usedWhoWhat it reported
Soh et al., J Food Drug Anal, 2025Chamomile and theanine drink, 5 days around the period30 young women with primary dysmenorrhea (15 per group)Pain scores fell by about 55 to 57% from baseline in the chamomile and theanine group
Khalajinia et al., Iran J Nurs Midwifery Res, 20241,000 mg chamomile capsules three times daily for 8 weeks102 women with endometriosis, in three groupsDysmenorrhea and pelvic pain scores lower than placebo
Lee et al., J Clin Med, 2018Aromatherapy (inhaled, massage, oral) versus placebo19 trials, 1,787 participantsPain lower than placebo (SMD -0.91); chamomile was not among the oils named

None of the three tested chamomile essential oil applied to the skin or inhaled. That is the central fact for a shopper, and it is why we would not tell anyone a bottle of our oil is a period-pain product.

The aromatherapy review, read closely

The aromatherapy review, Lee et al., Journal of Clinical Medicine, 2018, is the strongest evidence for the category and is also worth reading sceptically. It pooled 19 randomized placebo-controlled trials (1,787 participants) in primary dysmenorrhea. Overall pain was lower than placebo (SMD -0.91, 95% CI -1.17 to -0.64), with 11 massage trials (793 participants, SMD -0.87) and 7 inhalation trials (704 participants, SMD -1.02). Heterogeneity was very high (I-squared 88% overall). The authors rated the evidence moderate, but noted that few trials described allocation concealment (4) or blinded outcome assessors (5), that scented oils are hard to blind, that funnel-plot asymmetry hinted at publication bias, that only 2 trials checked adverse events, and that most trials came from Iran, Korea, Turkey and Egypt. The oils named were lavender, rose, rosemary, peppermint, ginger, clary sage and others. Chamomile was not. Reasoning from this: the evidence is about aromatherapy in general, and the oil in it is usually something other than chamomile, so carrying it over to our bottles would be an inference.

The chamomile trials: real, but not oil

The Soh trial is small (15 per group) and its drink combined chamomile with theanine, so the effect cannot be assigned to chamomile alone; the comparison drink was chamomile-flavoured. The Khalajinia trial is in endometriosis, not ordinary period pain, and used 1,000 mg capsules three times daily for eight weeks, a dose of a swallowed product that has no equivalent in our oils, which we say are not for internal use. A 2019 systematic review of chamomile and premenstrual syndrome, Khalesi et al., Journal of Pharmacopuncture, found 8 randomized trials and concluded that chamomile was effective, but the abstract does not state the forms or doses, and PMS is a different problem from cramps. A broader 2026 meta-analysis of plant-derived therapies, Wu et al., Phytotherapy Research, pooled 22 trials. Herbal products beat placebo (mean difference -1.83, 95% CI -2.32 to -1.34) and were similar to mefenamic acid or ibuprofen (MD 0.12, 95% CI -0.29 to 0.53), but the certainty was low to very low.

Heat: the better-supported self-care step

A 2026 meta-analysis, Yuan et al., Frontiers in Medicine, pooled 57 randomized trials with 5,359 participants on heat therapy for primary dysmenorrhea. Against NSAIDs, pain differences were described as comparable (22 trials, 1,938 participants, weighted mean difference -1.10 cm), and adverse effects were less frequent with heat (8 trials, 728 participants, risk ratio 0.30). The authors are frank about the weaknesses: concealment was reported in 30% of trials, only 5% blinded participants, and certainty was low for most outcomes. The NHS page on period pain lists a heat pad or hot water bottle wrapped in a tea towel on the tummy, a warm bath or shower, massaging the tummy and back, gentle exercise, and over-the-counter painkillers such as paracetamol or ibuprofen.

We would put heat first and say so plainly. Even with low-certainty evidence, it has far more trials than chamomile oil, a named place in NHS advice, and none of the skin-reaction questions an oil raises.

If you want chamomile in your routine anyway

The NHS lists massaging the tummy and back among its self-help steps. If you want fragrance in that massage, our German or Roman oil can be diluted for it, and that is a scent choice, not a study result. Both are sold undiluted. The product page range is 0.5% to 2% in a carrier oil: for a 30 ml (about 1 oz) bottle, 1% is 0.3 ml, which is the arithmetic, not a tested recipe. Patch test first (how to patch test) and see chamomile oil massage for technique. We do not sell carrier oils or heat packs. Keep the oil off broken skin and away from your eyes, and do not swallow it. Chamomile tea is a different product from our oil, which is for external use only.

When it is a medical question

The NHS says to ask for an urgent GP appointment or call 111 if pelvic or period pain is severe or worse than usual and painkillers have not helped. It lists seeing a GP if periods become more painful, heavier or irregular, if pain stops you doing normal daily activities, if you have pain during sex or when peeing or pooing, if you bleed between periods, or if you have a swollen tummy, loss of appetite or unexplained weight loss. Some of those are the kind of pattern an OB-GYN works up, and the Khalajinia trial population shows why: endometriosis exists and has its own care. A bottle of oil is not a substitute for that conversation.

If you are pregnant or breastfeeding, this is not a guide for you; read our pregnancy and breastfeeding article and ask an OB-GYN or midwife. For general limits see chamomile essential oil safety, and for muscle and joint pain see that guide.

Our verdict: use heat and the other NHS-listed steps first, see an OB-GYN if the pain is severe or changing, and treat a chamomile-scented massage as a personal preference rather than something the trials back.

Roman Chamomile Essential Oil bottle

Roman Chamomile Essential Oil

Roman Chamomile Essential Oil from our own shop, in sizes from 0.5 oz to bulk.

From $32.99

Shop Now →

Sources & Further Reading