--- title: Magnesium for PMS dosage: how much and when to take it description: Magnesium for PMS dosage ranges from 200 to 360 mg a day in trials, taken daily or only in the luteal phase. Here's the safe upper limit too. url: https://niyora.com/treatments/magnesium-dosage/ --- - [Niyora](https://niyora.com/) - [Treatments](https://niyora.com/treatments/) - Magnesium dosage for PMS and PMDD: how much to take Treatment # Magnesium dosage for PMS and PMDD: how much to take Magnesium for PMS dosage in clinical trials is either 200 mg a day taken every day, or 360 mg a day taken only from day 15 of the cycle to the period. Most trials took about two months to show an effect, and none tested a dose specifically for PMDD. Updated 14 October 2026 Niyora editorial Mixed evidence Strength of evidence Mixed Trials disagree, or the effect is small. - None - Limited - Mixed - Moderate - Strong ## At a glance - Trials used two doses: 200 mg a day, taken continuously, or 360 mg a day, taken only from day 15 of the cycle until the period starts. - Both schedules took about two months in the trials that measured it before symptoms eased. - No trial in this evidence used magnesium glycinate specifically or a confirmed PMDD diagnosis, so PMDD dosing is extrapolated from PMS research. - Doses above 360 mg a day haven't been studied for PMS and are more likely to cause stomach upset. - A doctor should weigh in if you have kidney disease, take interacting medication, or your symptoms take over a week each month. ## Strength of evidence Mixed evidence - None - Limited - Mixed - Moderate - Strong Three small RCTs found daily or luteal-phase magnesium eased mood and fluid symptoms by the second cycle, but a fourth saw benefit only combined with vitamin B6, and a meta-analysis found no clear link between blood magnesium levels and PMS. No trial has tested a PMDD-specific dose. ## What's the usual dose of magnesium for PMS? Trials on magnesium and PMS settled on two doses: 200 mg a day, or 360 mg a day. The form differed too, magnesium oxide in the lower-dose trials, magnesium pyrrolidone carboxylate in the higher-dose ones. | Trial | Dose | Timing | What it found | | --- | --- | --- | --- | | Obstetrics & Gynecology, 1991 | 360 mg a day (split into three doses) | Day 15 of the cycle to the start of the period | Lower total symptom score and less negative mood by the second month | | Headache, 1991 | 360 mg a day (split into three doses) | Day 15 of the cycle to the start of the period | Fewer migraine days and lower premenstrual scores | | Journal of Women's Health, 1998 | 200 mg (as magnesium oxide) a day | Every day, for two full cycles | No change in month one, less bloating and breast tenderness in month two | | J Women's Health & Gender-Based Medicine, 2000 | 200 mg magnesium plus 50 mg vitamin B6 a day | Every day, for one cycle | A modest drop in anxiety-related symptoms like mood swings and irritability | In the trials that tracked results across two cycles, magnesium took about two months to show its clearest effect. The one-cycle 2000 trial, which combined magnesium with vitamin B6, found a modest effect within a single cycle. Of these four trials, three found magnesium eased symptoms on its own; the fourth found a benefit only when combined with vitamin B6, not from magnesium alone. ## How much magnesium glycinate for PMDD? None of the trials above used magnesium glycinate, and none diagnosed PMDD with daily symptom tracking across two cycles, the method DSM-5-TR requires. They studied PMS, diagnosed with the Moos Menstrual Distress Questionnaire, a broader and looser measure. That distinction matters because PMS and PMDD aren't interchangeable. If you're looking for a dose tested specifically in women with a confirmed PMDD diagnosis, this body of research doesn't have one. In practice, the 200 to 360 mg range from PMS trials is the closest evidence available. Glycinate is a well-absorbed form of magnesium, so it's reasonable to think the same 200 to 360 mg range would apply, though this hasn't been tested directly. For PMDD itself, guidelines point to treatments with trial support behind them: - SSRIs, which some people take only in the luteal phase - Certain hormonal contraceptives - CBT A doctor decides which fits. See [magnesium for PMDD](https://niyora.com/treatments/magnesium-for-pmdd/) and [supplements for PMDD](https://niyora.com/treatments/supplements-for-pmdd/) for how magnesium fits alongside those. ## Should you take it daily or only before your period? Trials used both schedules, and both showed results, just not until the second month. - **Daily, all month, 200 mg:** easier to keep up since you're not watching the calendar. Took two full cycles before fluid-related symptoms like bloating eased in one trial. - **Luteal phase only, 360 mg from day 15 to your period:** matches the window when estrogen and progesterone are dropping. Improved overall symptom scores and mood by the second month in two trials from the same research group. Neither schedule showed much in the first month in the trials that measured it, so give whichever one you try at least two cycles before deciding it isn't working. More on timing is in [how long magnesium takes to work](https://niyora.com/treatments/how-long-does-magnesium-take-to-work/). Niyora is a PMS and PMDD support app. While you wait those two months to see if magnesium is helping, Niyora's estimated PMS window can help you notice whether your symptoms are actually easing cycle to cycle. ## What happens if you take too much magnesium? None of the trials above tested doses higher than 360 mg a day, so that's the upper edge of what's actually been studied for PMS. Above that, oral magnesium is more likely to cause: - Loose stools or diarrhea - Stomach cramping or nausea These usually ease once you lower the dose or take it with food. More detail, including the mood-related side effects some people report, is on [magnesium side effects](https://niyora.com/treatments/magnesium-side-effects/). When to see a doctor People with kidney disease process magnesium differently, and some medications (certain antibiotics, diuretics, or heart medications) can interact with it. ## Does the dose differ for PMS and PMDD? The trials behind these numbers didn't separate PMS from PMDD the way guidelines define it now. They used the Moos Menstrual Distress Questionnaire, a broad PMS measure, not the daily DSM-5-TR tracking that confirms PMDD. In practice, most people use the same 200 to 360 mg range for either, since there's no separate PMDD dosing trial to point to. What does differ is the wider treatment plan: PMDD guidelines also include SSRIs, some hormonal contraceptives, and CBT, options magnesium doesn't replace. Read more on [PMS treatment](https://niyora.com/treatments/pms-treatment/) and [magnesium for PMS](https://niyora.com/treatments/magnesium-for-pms/) for how it fits into that wider picture. If you've tried magnesium for two full cycles with no change, or your mood symptoms take over a week of most months, see a GP or gynecologist and bring two months of daily notes. From the research library ## Research on magnesium 98 studies in the library look at magnesium in PMS and PMDD. They were published from 1981 to 2026, and each one has a short summary of what was tested and found. 98 studies, 1981 to 2026 How strong the studies are Strong study design 8 Moderate study design 31 Early or limited evidence 59 - [Systematic review, 2025Do nutritional interventions help with emotional symptoms of PMS?Vitamin B6, calcium, and zinc consistently improved emotional PMS symptoms. Other nutrients like vitamin D, magnesium, and soy had insufficient evidence supporting their use.Strong study design](https://niyora.com/research/papers/effect-of-nutritional-interventions-on-the-psychological-symptoms-of-2025/) - [Systematic review, 2013Does Vitex (chaste tree) help PMS and PMDD symptoms?Most studies found Vitex better than placebo for PMS. For PMDD, results were mixed: one study showed it equal to fluoxetine, while another found fluoxetine more effective. Side effects were mild.Strong study design](https://niyora.com/research/papers/vitex-agnus-castus-extracts-for-female-reproductive-disorders-a-systematic-2013/) - [Systematic review, 2009Which 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](https://niyora.com/research/papers/herbs-vitamins-and-minerals-in-the-treatment-of-premenstrual-syndrome-a-2009/) - [Systematic review, 2007What treatments work for premenstrual syndrome?Many treatments have been studied for PMS, but researchers face a major challenge: there is no standard way to measure symptom severity, making it difficult to know which treatments truly work.Strong study design](https://niyora.com/research/papers/premenstrual-syndrome-2007/) - [Randomised trial, 2003What treatments work for PMS and PMDD?Several treatments work. Non-drug options include cognitive behavioral therapy, exercise, and supplements like calcium and magnesium. Many studies support SSRIs (taken daily or only before menstruation). Hormonal treatments that stop ovulation also help.Strong study design](https://niyora.com/research/papers/a-review-of-treatment-of-premenstrual-syndrome-and-premenstrual-dysphoric-2003/) - [Randomised trial, 2003What complementary and alternative medicines help with women's reproductive health issues?Acupressure helps with pregnancy nausea and calcium helps with PMS. Vitamin B6, ginger, magnesium, chaste-tree berry, low-fat diet, exercise, and fish oil show promise but need more research.Strong study design](https://niyora.com/research/papers/complementary-and-alternative-medicine-cam-in-reproductive-age-women-a-review-of-2003/) [See all 98 studies on magnesium](https://niyora.com/research/topics/treatment-magnesium/) ## Questions people ask How much magnesium should I take for PMS? + Trials on magnesium for PMS used either 200 mg a day taken every day, or 360 mg a day taken only from day 15 of the cycle until the period starts. Both schedules showed their clearest effect by the second month of use, not the first. Is magnesium glycinate the right form for PMDD? + No trial in this research used magnesium glycinate specifically for PMDD. The PMS trials that exist used magnesium oxide or magnesium pyrrolidone carboxylate, at 200 to 360 mg a day. Glycinate is well absorbed, but there's no dedicated PMDD dosing trial for it or any other form. Can I take magnesium every day instead of only before my period? + Yes. One trial gave 200 mg of magnesium every day for two full cycles and saw less bloating and breast tenderness by the second cycle. Another gave 360 mg only from day 15 to the period and saw lower overall symptom scores, also by month two. What's the maximum safe dose of magnesium for PMS? + The PMS trials behind these numbers only tested up to 360 mg a day, so that's the highest dose with trial evidence behind it for this use. Doses above that raise the chance of loose stools, cramping, or nausea, and kidney disease changes how the body handles magnesium. ## Sources - 1. [The Association Between Serum Magnesium and Premenstrual Syndrome: a Systematic Review and Meta-Analysis of Observational Studies](https://doi.org/10.1007/s12011-019-01672-z), Biological trace element research, 2019 - 2. [Magnesium prophylaxis of menstrual migraine: effects on intracellular magnesium](https://doi.org/10.1111/j.1526-4610.1991.hed3105298.x), Headache, 1991 - 3. [Oral magnesium successfully relieves premenstrual mood changes](https://pubmed.ncbi.nlm.nih.gov/2067759/), Obstetrics and gynecology, 1991 - 4. [Magnesium supplementation alleviates premenstrual symptoms of fluid retention](https://doi.org/10.1089/jwh.1998.7.1157), Journal of women's health, 1998 - 5. [A synergistic effect of a daily supplement for 1 month of 200 mg magnesium plus 50 mg vitamin B6 for the relief of anxiety-related premenstrual symptoms: a randomized, double-blind, crossover study](https://doi.org/10.1089/152460900318623), Journal of women's health & gender-based medicine, 2000 - 6. [The Importance of Magnesium in Clinical Healthcare](https://doi.org/10.1155/2017/4179326), Scientifica, 2017 Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗ On this page - [What's the usual dose of magnesium for PMS?](#what-s-the-usual-dose-of-magnesium-for-pms) - [How much magnesium glycinate for PMDD?](#how-much-magnesium-glycinate-for-pmdd) - [Should you take it daily or only before your period?](#should-you-take-it-daily-or-only-before-your-period) - [What happens if you take too much magnesium?](#what-happens-if-you-take-too-much-magnesium) - [Does the dose differ for PMS and PMDD?](#does-the-dose-differ-for-pms-and-pmdd) - [Research](#research) - [Questions](#faq) Niyora PMS & PMDD support For the hard moment before your period. Private, no account. [Get it on iPhone](https://apps.apple.com/app/niyora-pms-emotions/id6764561688) ## Keep reading Treatment Magnesium supplement for PMS: does it work? Treatment Magnesium for PMDD: does it work? Treatment Magnesium side effects, including mood Treatment How long does magnesium take to work? Treatment PMS treatment: what actually helps Condition What is PMS? Premenstrual syndrome, explained Guide Magnesium, calcium, vitamin D Treatment Supplements for PMDD: what actually helps Treatment Calcium supplements for PMS: does it work?