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Supplements for PMS and PMDD: Calcium, Chasteberry, Vitamin B6 and When You Need Treatment

PMDD is a medical condition: three SSRIs and a drospirenone pill are FDA-approved for it. Don't stop a prescribed medicine yourself; if PMDD brings thoughts of suicide, call or text 988 (US). For PMS, calcium has the best supplement evidence: 1,200 mg a day cut symptoms 48% against 30% with placebo in 466 women (grade B). Chasteberry helped (grade B), though most of its trials were at high risk of bias; avoid it in pregnancy and on hormonal birth control.

Published How we grade evidenceEditorial policy

This guide is for adults with premenstrual syndrome (PMS: mood and body symptoms in the week or two before a period) or premenstrual dysphoric disorder (PMDD, its severe form).

PMDD is a medical condition with treatments that work, not something to manage with supplements alone. Antidepressants called SSRIs and some hormonal options help many people. If you have thoughts of ending your life or hurting yourself around your period, call or text 988 now (US); elsewhere, call your emergency number. Don't stop, skip or swap a prescribed medicine for a supplement without talking to your prescriber.

The short version

  • Calcium lowered PMS symptoms in two US trials, including 466 women taking it for 3 cycles. Grade B (Thys-Jacobs 1998; Thys-Jacobs 1989).
  • Chasteberry (vitex) beat placebo in women with PMS. Its grade B rests on three well-reported placebo-controlled trials; most of its other trials have a high risk of bias. Grade B (Verkaik 2017; Csupor 2019). Avoid it in pregnancy, with hormone-sensitive cancers, on hormonal birth control and during fertility treatment.
  • Vitamin B6 helped in a review of 9 trials (940 women), but most trials were poor quality, and high doses can damage nerves. Grade C (Wyatt 1999).
  • Magnesium, saffron and vitamin D: small or low-certainty trials. Grade C (Facchinetti 1991; Agha-Hosseini 2008; Zainab 2026). High-dose saffron can be harmful; avoid saffron supplements in pregnancy (Bostan 2017; Alshdefat 2026).
  • For PMDD and severe PMS, SSRIs probably reduce symptoms, on moderate-certainty evidence from 12 trials (1,742 women with PMS or PMDD) (Jespersen 2024).
OptionWhat trials foundSizeGradeNotes
CalciumFewer PMS symptoms by the third cycle48% vs 30% drop with placebo (466 women)BCalcium carbonate in the large trial
ChasteberryMore women with symptom relief2.57 times more likely to respond (3 trials, 520 women)BHigh risk of bias in most trials
Vitamin B6More improvement than placeboOdds ratio 2.32 (9 trials, 940 women)CLow-quality trials; nerve damage at high doses
MagnesiumMood symptoms eased in one trial32 womenCLater review: evidence insufficient
SaffronSymptoms easedModerate pooled effect in small studies, not all randomizedCAvoid supplements in pregnancy
Vitamin DLower total symptom scores5 trials, 436 women; very low certaintyCNo effect on anxiety
Evening primrose oilBest-controlled trials found no benefit7 trials looked atSkip

Is it PMS or PMDD?

PMS is common; PMDD is less common and much more disabling. The US Office on Women's Health (OWH) says over 90% of women get some premenstrual symptoms (OWH), while PMDD affects up to 5% of women of childbearing age and causes severe irritability, depression or anxiety, sometimes with thoughts of suicide (OWH). Symptoms start after ovulation and ease within a few days of the period starting.

Diagnosis rests on timing, so keep a daily symptom diary or app record for a few months and take it to your doctor (OWH). The trials below mostly enrolled women whose symptoms were confirmed this way. PMS and PMDD symptoms usually ease within a few days of the period starting (OWH), so tell your doctor if yours carry on past it.

What helps PMDD?

Prescription treatments have the strongest evidence. In a 2024 Cochrane review of 34 trials, SSRIs probably reduced premenstrual symptoms compared with placebo in women with PMS or PMDD (12 trials, 1,742 women; moderate certainty), and taking them every day probably worked better than taking them only in the two weeks before a period. Side effects included nausea, trouble sleeping, lower sex drive, tiredness and dizziness (Jespersen 2024). The FDA has approved three SSRIs and a birth control pill containing drospirenone for PMDD (OWH); in a Cochrane review of 5 trials (858 women, most with PMDD), drospirenone pills may improve symptoms, on low-quality evidence (Ma 2023).

Take low mood seriously. In a 2021 meta-analysis, women with PMDD were almost 7 times as likely to have attempted suicide and almost 4 times as likely to have had suicidal thoughts as women without it (Prasad 2021). If those thoughts come, even if they fade when your period starts, call or text 988 (US) and tell your doctor.

Does calcium help PMS?

Grade B: yes, in two US trials and several smaller ones. In a placebo-controlled trial at 12 US centres, 466 women with moderate to severe PMS took 1,200 mg of calcium a day as calcium carbonate or placebo for 3 cycles. By the third cycle, total symptom scores had fallen 48% with calcium against 30% with placebo, and mood, water retention, food cravings and pain all improved (Thys-Jacobs 1998). An earlier crossover trial of 33 women found the same direction (Thys-Jacobs 1989), and 500 mg a day helped 66 university students in Iran (Shobeiri 2017). A 2025 review of 31 trials found calcium consistently eased the mood symptoms of PMS, though only one included trial had a low risk of bias (Robinson 2025).

Food counts too: dairy, fortified foods and supplements all add to your daily total. Upper limit for adults: 2,500 mg of calcium a day up to age 50 and 2,000 mg from 51, from food and supplements combined, because more raises the risk of kidney stones (NIH ODS; check your stack).

Does chasteberry (vitex) help PMS?

Grade B: trials are mostly positive, but most have a high risk of bias. A 2017 review found 17 randomized trials; 13 of 14 analysed reported benefit, and the pooled effect against placebo was large, but differences between trials were extreme and the authors saw signs that negative trials went unpublished (Verkaik 2017). Keeping only 3 well-reported placebo-controlled trials of named extracts (520 women), women on chasteberry were 2.57 times as likely to see their symptoms ease (Csupor 2019). Its grade B rests on those three trials; our chaste tree page doesn't grade it for PMS yet. In one of the largest trials, 52% of 86 women on a fruit extract improved by at least half over 3 cycles, against 24% of 84 on placebo (Schellenberg 2001).

In 41 women with PMDD, fluoxetine (an SSRI) and chasteberry had similar response rates over 2 months, but fluoxetine worked better on mood and chasteberry on physical symptoms; this small, single-blind trial can't show they are equal (Atmaca 2003). For breast tenderness before a period, see supplements for breast pain.

Side effects in trials were mild: nausea, headache, stomach upset, period changes, acne and itchy rash (Daniele 2005). Who should avoid it:

  • Pregnancy and breastfeeding: NCCIH says it may be unsafe (NCCIH).
  • Hormone-sensitive conditions such as breast, uterine or ovarian cancer (NCCIH).
  • Hormonal birth control or menopause hormone therapy: the OWH says not to take chasteberry with them (OWH).
  • Fertility treatment: in one IVF case, hormone levels became disordered and signs of mild ovarian overstimulation appeared in the cycle chasteberry was taken (Cahill 1994).
  • Some medicines that block dopamine, such as certain antipsychotics, could in theory clash with it (Daniele 2005).

Does vitamin B6 help PMS?

Grade C: possibly, but the trials are weak. A 1999 BMJ review of 9 trials (940 women) found women on B6 were more likely to improve than on placebo (odds ratio 2.32), and depressive symptoms improved in 4 trials (541 women). The authors said most trials were low quality and that doses up to 100 mg a day were likely to help (Wyatt 1999). Talk to a clinician before taking B6 near that amount, and stop and get checked if you notice numbness, tingling or unsteadiness. A 2025 review also found B6 consistently helped mood symptoms in its trials (Robinson 2025).

Upper limit for adults: 100 mg of vitamin B6 a day in the US, and Europe's food-safety agency set 12 mg in 2023, because long-term high doses can cause nerve damage (sensory neuropathy) that can make movements unsteady. NIH notes reports of nerve damage below 500 mg a day, and that symptoms usually stop if B6 is stopped as soon as they appear (NIH ODS; check your stack). Many "PMS" blends and B-complex products also contain B6, so add them up.

Do magnesium, saffron or vitamin D help PMS?

Grade C for each: small or low-certainty trials. Our PMS page doesn't yet grade magnesium or saffron for overall symptoms.

  • Magnesium. In 32 women, magnesium taken in the second half of the cycle improved total symptoms and low mood more than placebo over 2 cycles (Facchinetti 1991), but a 2025 review judged the evidence for magnesium insufficient (Robinson 2025). Upper limit for adults: 350 mg of magnesium a day from supplements, because more often causes diarrhoea and cramps (NIH ODS).
  • Saffron. In an Iranian trial, saffron capsules for 2 cycles eased PMS and depression scores more than placebo (Agha-Hosseini 2008); a 2026 meta-analysis of small studies, not all randomized or placebo-controlled, found a moderate effect on PMS symptoms (Mohammadi 2026). Safety reviews found no significant harm at the doses used in trials, but high doses can be harmful: in pregnancy, higher doses have been linked to stimulating the womb (uterus) and to miscarriage, so don't take saffron supplements if you're pregnant (Bostan 2017; Alshdefat 2026).
  • Vitamin D. Pooling 5 trials (436 women), vitamin D lowered total PMS scores, physical symptoms and depression, but not anxiety, cravings or water retention, and the authors rated certainty very low (Zainab 2026). Our PMS page gives vitamin D's anxiety finding a B (mixed); this review found no anxiety effect.

Other options have thinner support. For omega-3 and other fatty acids, the 2025 review judged the evidence insufficient (Robinson 2025). Thiamine (vitamin B1) eased symptoms in one trial of 80 students (Abdollahifard 2014), which our PMS page gives a B; one trial supports C, and the same review called the evidence insufficient.

Are there supplements for PMDD?

Only small trials, so they are not a substitute for treatment.

  • L-tryptophan, grade C. In 71 women with PMDD, tryptophan taken in the second half of the cycle, through day 3 of the period, for 3 cycles cut mood symptoms by 34.5% against 10.4% with placebo (Steinberg 1999). It raises serotonin, so never combine it with an SSRI without your prescriber. Tryptophan supplements were withdrawn in 1989 after an outbreak of eosinophilia-myalgia syndrome, a rare illness that inflames muscles, skin and lungs, traced to contaminated tryptophan from one manufacturer (Das 2004; Ko 2023). Our PMDD page doesn't grade tryptophan yet.
  • Inositol, grade C, mixed. One crossover trial of 11 women found no benefit (Nemets 2002), while another reported better symptom and depression scores (Carlomagno 2011). Our PMDD page gives inositol a D (no effect) from depression trials.
  • 5-HTP: no trial has tested it as a PMDD treatment. With SSRIs it can cause serotonin syndrome; see can I take 5-HTP with SSRIs?

What we'd skip

  • Evening primrose oil: the two best-controlled trials found no benefit for PMS, and a review of 7 trials judged it of little value (Budeiri 1996).
  • High-dose B6 products above the upper limit, given the nerve-damage risk (NIH ODS).
  • Chasteberry if you're pregnant, breastfeeding, on hormonal birth control, in fertility treatment or have a hormone-sensitive cancer (NCCIH; OWH; Cahill 1994).
  • Using supplements instead of PMDD treatment when symptoms disrupt work, relationships or safety (Jespersen 2024).

Safety and interactions

  • SSRIs and other antidepressants: tryptophan and 5-HTP add serotonin; ask your prescriber before combining. See also supplements and antidepressants.
  • Thyroid medicine: calcium and magnesium lower levothyroxine absorption, so keep them hours apart; see supplements and thyroid medicine.
  • Kidney disease or past kidney stones: ask before calcium or magnesium supplements.
  • Pregnancy or trying to conceive: ask your midwife, obstetric or fertility team about every supplement, and avoid chasteberry and saffron supplements.
  • Under 18: many PMS trials enrolled students, but ask a clinician before giving any supplement to a teenager.

When to see a doctor

  • Now, or call or text 988 (US): thoughts of suicide or self-harm, before or during your period.
  • Book an appointment if premenstrual symptoms disrupt work, study or relationships, or if you might have PMDD; bring your symptom diary.
  • See a doctor if low mood or anxiety continues after your period ends, if periods are very heavy, painful or irregular (see supplements for period pain), or if new premenstrual symptoms start in your 40s (see supplements for perimenopause).
  • Stop B6 and see a doctor for numbness, tingling or unsteady movements.

FAQ

What is the best supplement for PMS? Calcium has the most consistent trial support (grade B): 1,200 mg a day cut symptoms by 48% against 30% with placebo in 466 women. Chasteberry also helped in trials (grade B), but most of them had a high risk of bias.

Can I take chasteberry with birth control? The US Office on Women's Health says women on hormonal birth control or menopause hormone therapy should not take chasteberry. Avoid it in pregnancy and fertility treatment too.

How long does it take for supplements to help PMS? Most trials ran for 2 or 3 menstrual cycles. In the large calcium trial, the effect was clear by the second cycle and largest by the third.

Can supplements treat PMDD? Not on their own. Tryptophan and inositol have only small trials. Three SSRIs and a drospirenone pill are FDA-approved for PMDD and have more evidence. Don't stop a prescribed medicine without your prescriber, and if you have suicidal thoughts, call or text 988 (US).

Is it safe to take vitamin B6 for PMS? Adults should stay at or below the US upper limit of 100 mg a day (Europe's is 12 mg), and the limit is lower for teenagers, because high doses taken for a long time can damage nerves. Talk to a clinician before taking amounts near the limit. If you lose feeling or your movements become unsteady, stop taking it and get checked.

Sources

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