Primary Dysmenorrhea

Overview

Vitamin E (5 studies) has the strongest evidence for primary dysmenorrhea, with trials showing that 200–500 IU daily starting two days before menstruation may reduce pain severity and duration. Vitamin D (3 studies) shows limited but consistent signals of modest pain relief across varying doses. Boron (1 study) may reduce pain and shorten duration when taken around the menstrual period, though evidence is preliminary.

See the heatmap and evidence reviews below for trial-level detail.

Effect graph

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Relevant supplements

Relevant supplements sorted by DEX Score.


Vitamin E	★★★★★	Medium
Vitamin D	★★★★★	Medium
Boron	★★★★★	Low

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Studies

Find individual evidence reviews for supplements sorted by DEX Score.

3 supplements for and rated at least stars. All purchase bands. No minimum star filter.

Vitamin EView supplement →

Consider purchase★★★★★

How we scored this

Effect SizeMediumEvidenceHighTrustVery High

Evidence Review

Taking vitamin E by mouth seems to help reduce pain in young women with menstrual cramps (primary dysmenorrhea).
Studies found that taking 200 to 500 IU of vitamin E daily—starting 2 days before your period and continuing for the first 3 days—can make the pain less severe and shorter, and may also reduce menstrual bleeding compared to not taking it.
One study showed that vitamin E combined with fish oil works better to relieve pain than taking vitamin E or fish oil alone.
A review of eight studies confirmed that vitamin E can reduce menstrual pain.

Browse 5 studies1 meta-analysis

MetaThe effects of vitamin E on the intensity of primary dysmenorrhea: A systematic review and meta-analysis2022n=8

In a meta-analysis of 8 participants, the results of meta-analysis revealed that vitamin E consumption significantly reduced PD mean intensity in the first month (n = 7 records; SDM = -1.16; 95%CI: -2.16 to -0.17; I 2 = 31.9%; P = 0.02) and the second month (n = 8 records; SDM = -1.83; 95%CI: -2.90 to -0.77; I 2 = 76.3.9%; P < 0.0001)...

Effect: Benefit
Population: Women
Participants: 8

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RCTThe Effect of Combined Vitamin C and Vitamin E Supplementation on Oxidative Stress Markers in Women with Endometriosis: A Randomized, Triple-Blind Placebo-Controlled Clinical Trial2021n=30

In an RCT of 30 participants, 1000 mg/day, for 8 weeks, there was no significant decline in total antioxidant capacity after treatment.

Effect: Benefit
Duration: 8 weeks
Dose: 1000 mg/day
Population: Women
Participants: 30
Ages: 15–45

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RCTVitamin E and fish oil, separately or in combination, on treatment of primary dysmenorrhea: a double-blind, randomized clinical trial2018n=25

In 100 university students with primary dysmenorrhea, daily omega-3 (180 mg EPA + 120 mg DHA), vitamin E 200 IU, or combined therapy all reduced menstrual pain versus placebo, with the combination most effective.

Effect: Benefit
Dose: 200 IU/day
Population: Women
Participants: 25

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RCTA randomised controlled trial of vitamin E in the treatment of primary dysmenorrhoea2005

In an RCT, vitamin E relieves the pain of primary dysmenorrhoea and reduces blood loss.

Effect: Benefit
Ages: 15–17

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RCTA randomised placebo-controlled trial to determine the effect of vitamin E in treatment of primary dysmenorrhoea2001

In an RCT in women, both placebo and vitamin E are effective in relieving symptoms due to primary dysmenorrhoea, but the effects of vitamin E are more marked.

Effect: Benefit
Population: Women
Ages: 16–18

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Vitamin DView supplement →

Consider purchase★★★★★

How we scored this

Effect SizeMediumEvidenceHighTrustMedium

Evidence Review

Some limited research suggests taking vitamin D by mouth may slightly reduce menstrual pain in people with dysmenorrhea.
Studies using different amounts of vitamin D, from 5000 IU daily up to 300,000 IU monthly, showed small pain relief compared to no treatment, but the research varied a lot.
One small study in teenagers taking 50,000 IU of vitamin D weekly for nine weeks also showed modest pain relief, although it lacked a comparison group.

Browse 3 studies1 meta-analysis

Systematic reviewVitamin D for primary dysmenorrhea and endometriosis-related pain - A systematic review of registered RCTs2025n=308

A systematic review of 7 registered RCTs (308 participants) found vitamin D may reduce primary dysmenorrhea pain severity on visual analog scale (MD −1.12), but evidence certainty was low and endometriosis results were null.

Effect: No Benefit
Duration: 2 months
Dose: 1000 IU/day
Population: Adults
Participants: 308
Ages: 18–50

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MetaEffect of Vitamin D Supplementation on Primary Dysmenorrhea: A Systematic Review and Meta-Analysis of Randomized Clinical Trials2023n=695

A meta-analysis of RCTs in 695 women found vitamin D supplementation significantly reduced primary dysmenorrhea pain scores versus placebo.

Effect: Benefit
Dose: 50000 IU/day
Population: Women
Participants: 695

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Clinical trialHigh dose vitamin D supplementation can improve menstrual problems, dysmenorrhea, and premenstrual syndrome in adolescents2018

A 9-week study in 897 adolescent girls found high-dose vitamin D (50,000 IU/week) reduced PMS prevalence from 14.9% to 4.8% and improved dysmenorrhea rates.

Effect: Benefit
Duration: 9 weeks
Dose: 50000 IU/day
Population: Children/adolescents

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BoronView supplement →

Reconsider purchase★★★★★

How we scored this

Effect SizeLowEvidenceLowTrustMedium

Evidence Review

Taking 10 mg of boron daily around your period (starting two days before and continuing for three days) may reduce menstrual pain and shorten how long it lasts.
A small study showed boron lowered pain by about a quarter and cut pain duration by one-third, more than placebo.
Boron seems to work by reducing inflammation during menstruation.
The supplement was safe and well tolerated in the study.
More research is needed but boron might help with painful periods.

Browse 1 study

RCTEffects of boron supplementation on the severity and duration of pain in primary dysmenorrhea2015n=58

In 113 university students with primary dysmenorrhea, 10 mg/day boron taken from 2 days before menses through day 3 for two cycles significantly reduced menstrual pain severity and duration versus placebo.

Effect: Benefit
Dose: 10 mg/day
Population: Women
Participants: 58

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Evidence visualised

Same ratings as above, aggregated so you can see coverage and imbalance.

Purchase-guidance distribution

How many supplements fall in each purchase band

Effect-size distribution

How large the reported benefits tend to be

Study distribution across 3 supplements for primary dysmenorrhea (9 studies total).
Supplement	DEX	Studies	Meta-analyses	Share
Vitamin E	★★★★★72%	5	1	56%
Vitamin D	★★★★★64%	3	1	33%
Boron	★★★★★44%	1	0	11%

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Overview

Effect graph

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Studies

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