At a glance
- The main placebo-controlled trial gave women 30 mg of saffron a day for two menstrual cycles and found a significant drop in total PMS symptoms and depression scores by the end of the first treated cycle (4).
- A head-to-head trial found saffron eased bloating, low mood and mood swings about as well as fluoxetine after two months of daily use (3).
- A 2026 meta-analysis of several trials found saffron had a significant effect on PMS symptoms overall, with some benefit for period pain too (1).
- No saffron trial has tested just a few days of use or luteal-only dosing, so there's no evidence it works as fast as some SSRI regimens.
- Every trial that showed saffron working used a daily symptom log to prove it, which is worth copying if you try it yourself.
Strength of evidence
Moderate evidence
Multiple small randomized trials and a 2026 meta-analysis (SMD -0.64 for PMS symptoms) show saffron taken daily for one to two cycles eases PMS symptoms. Most trials are short, come from a few research groups, and none has tested faster or shorter dosing schedules.
How long does saffron take to work?
Most saffron research for PMS doesn't test a quick fix. The main placebo-controlled trial gave women 30 mg of saffron a day (15 mg in the morning, 15 mg at night) for two menstrual cycles, and tracked results with a daily symptom diary and a depression scale (4).
By the end of the first treated cycle, the saffron group already scored lower than placebo on total PMS symptoms and on depression, a difference the trial reported as statistically significant, and the difference held through the second cycle (4).
A separate trial compared saffron with fluoxetine over two months of daily use and found saffron eased bloating, low mood and mood swings about as well as the antidepressant by the end of that period (3).
The realistic timeline, based on what's actually been tested, is at least one full cycle before you'd expect to notice anything, with a clearer picture after two.
| Trial | Dose | Duration | What it found |
|---|---|---|---|
| Saffron vs placebo, BJOG 2008 (4) | 30 mg/day (15 mg x2) | 2 cycles | Significant drop in total PMS symptoms and depression scores, both treated cycles |
| Saffron vs fluoxetine, 2020 (3) | Daily capsule | 2 months | Eased bloating, depression and mood swings about as well as fluoxetine |
| Meta-analysis of multiple trials, 2026 (1) | Pooled across trials | Varies by trial | Significant effect on PMS symptoms overall (SMD -0.64) |
No saffron trial has tested just a few days of use or luteal-only dosing, so there's no evidence it works as fast as some SSRI regimens.
What are the signs it's working?
Trials didn't ask women how they felt in general. They used daily ratings of specific symptoms, so those are the signs worth watching for yourself:
- Less bloating and breast tenderness in the days before your period (3)(4)
- Lower daily scores for low mood, tension or mood swings (3)(4)(1)
- Less abdominal or period pain, based on a 2026 meta-analysis across several trials (1)
- A smaller gap between how you feel the week before your period and the rest of the month
None of these need to disappear completely for saffron to count as working. The trials measured a drop in severity, not a cure, so a milder version of a familiar symptom is still a real signal.
How long do the effects last?
No saffron trial has followed women long enough to say what happens after two menstrual cycles. Every trial that tested saffron for PMS stopped measuring after two menstrual cycles or two months of continuous daily use (4)(3).
No trial has followed women past that point, so there's no evidence on what happens if you stop saffron, or whether the benefit fades or holds if you keep taking it for six months or a year.
That's different from knowing saffron doesn't last. It just means nobody has checked yet.
If saffron is working within those first one to two cycles, the trials suggest continuing it through that window is reasonable. Beyond that, treat it the way you would any supplement with limited long-term data: check in with a doctor from time to time, and keep an eye on the side effects worth tracking.
What if it doesn't work?
Saffron doesn't help everyone, and PMS has more than one cause, so that's not a reflection on you. If two full cycles at a typical saffron dosage haven't changed anything, it's reasonable to try something else rather than keep waiting.
Other options with trial evidence behind them:
- Calcium supplements, which have their own evidence base for PMS, see calcium for PMS
- Magnesium, covered in magnesium for PMS
- Combined oral contraceptives, which a large meta-analysis found can ease depressive and overall PMS symptoms (2)
- SSRIs and CBT, which guidelines recommend and a doctor can walk you through, see PMS treatment: what actually helps
If what you're dealing with sounds more like PMDD than PMS, the evidence for saffron looks different; see saffron for PMDD.
Should you track symptoms while you wait?
Yes. The main placebo-controlled trial proved saffron worked using a daily symptom log, not memory, which is worth copying if you try it yourself (4). Guessing whether you feel better by the end of a stressful month is unreliable. A day-by-day note is not.
A simple way to do it:
- Note your mood, bloating and pain once a day, around the same time, for one full cycle before you start saffron.
- Keep the same daily note for the first one to two cycles you take it.
- Compare the two records side by side instead of relying on how last month "felt" overall.
Niyora is a PMS and PMDD support app with an estimated PMS window, so you can see where you are in your cycle while you log how you're actually feeling day to day. It won't tell you whether saffron is working, but lining your notes up with your cycle makes a real pattern easier to spot than counting on memory alone.
For the wider picture on what else has evidence behind it, see PMS supplements: what actually helps.
From the research library
Research on saffron
18 studies in the library look at saffron in PMS and PMDD. They were published from 2008 to 2026, and each one has a short summary of what was tested and found.
18
studies, 2008 to 2026
How strong the studies are
- Strong study design
- 4
- Moderate study design
- 7
- Early or limited evidence
- 7
Systematic review, 2026
Does saffron reduce PMS and period pain symptoms?
Yes, saffron significantly reduced both PMS symptoms and period pain in the combined analysis of randomized trials. The effect sizes were moderate, suggesting a meaningful improvement.
Strong study design
Randomised trial, 2025
Does the PMSoff supplement help PMS and PMDD symptoms?
Yes, based on this trial. The 218 women taking PMSoff had significantly better symptom relief after one month compared to placebo, and even greater relief after two months.
Strong study design
Systematic review, 2023
Does saffron help with PMS, labor pain, and menopause symptoms?
Yes, saffron improves mood and reduces psychological symptoms of PMS and menopause, and helps reduce labor pain and recovery time, though limited studies exist.
Strong study design
Systematic review, 2009
Which herbs, vitamins and minerals help treat PMS?
Only calcium has good evidence to work for PMS. Chasteberry and vitamin B6 may help, but most of the 62 products people try lack proper research.
Strong study design
Survey study, 2023
Can diet help reduce PMS symptoms?
A review of past studies found that calcium, vitamin B6, and chasteberry fruit likely help PMS symptoms, while saffron, ginger, and high vitamin D have weaker evidence.
Moderate study design
Review, 2023
Can herbs and supplements help with PMS symptoms?
Herbs like chaste berry and supplements like calcium and magnesium may help with PMS. Evidence is strongest when combined with lifestyle changes and therapy, though more research is needed.
Moderate study design
Questions people ask
Does saffron work right away for PMS?+
No. The trials behind saffron for PMS dosed it daily and measured results after a full menstrual cycle, not after a few days. The clearest difference from placebo showed up by the end of the first treated cycle and held through the second (4).
How long should I try saffron before giving up on it?+
Trials ran for two menstrual cycles or two months of daily use before judging whether saffron helped (4)(3). That's a reasonable length to try before deciding it isn't for you and talking to a doctor about other options.
Is saffron as effective as fluoxetine for PMS?+
One trial comparing the two found saffron eased bloating, depression and mood swings about as well as fluoxetine after two months of daily use (3). It's one trial, so treat it as a promising comparison, not a settled answer.
Can saffron help PMDD the same way it helps PMS?+
The trials in this article studied PMS, not a confirmed PMDD diagnosis. If your symptoms fit the PMDD pattern, the evidence and what's worth trying first can differ; see saffron for PMDD.
What dose of saffron do the PMS trials use?+
The main placebo-controlled trial used 30 mg a day, split into 15 mg in the morning and 15 mg at night, for two menstrual cycles (4). See saffron dosage for more on how that's typically taken.
Sources
- 1.Effect of saffron on premenstrual syndrome and dysmenorrhea: a systematic review and meta-analysis, Korean journal of family medicine, 2026
- 2.Efficacy of combined oral contraceptives for depressive symptoms and overall symptomatology in premenstrual syndrome: pairwise and network meta-analysis of randomized trials, American journal of obstetrics and gynecology, 2021
- 3.Comparison of Saffron versus Fluoxetine in Treatment of Women with Premenstrual Syndrome: A Randomized Clinical Trial Study, Indian Journal of Forensic Medicine & Toxicology, 2020
- 4.Crocus sativus L. (saffron) in the treatment of premenstrual syndrome: a double-blind, randomised and placebo-controlled trial, BJOG : an international journal of obstetrics and gynaecology, 2008