Magnesium for PMS
and period cramps.
Can magnesium for period cramps and PMS really make that week easier? Here is what the trials found, how much magnesium they used, which form is gentlest, when in your cycle to start, and the simple habits that work alongside it.
This guide is for education. Severe or worsening period pain, very heavy periods, or PMS that affects your work or relationships need a doctor. Magnesium is a nutrient, not a medicine for any condition.
Why periods hurt, and why PMS happens
What causes period cramps?
Period cramps happen when the muscle of the womb tightens to shed its lining. Chemicals called prostaglandins, made in the womb, are thought to drive these squeezes. PMS is a separate group of symptoms, such as mood swings, bloating and tender breasts, that start in the week or two before a period and ease once it begins.
Most period pain is primary dysmenorrhoea: cramps with no disease behind them, usually lasting up to three days.1,2 It is extremely common in India. A review of 20 years of Indian studies found painful periods in 50 to 80% of young women and premenstrual symptoms in 40 to 71%, yet only a small share ever asked a doctor for help.3
So where does magnesium come in? Magnesium contributes to normal muscle function, normal psychological function, electrolyte balance and the reduction of tiredness and fatigue.4 Researchers think it may also help the womb muscle relax and calm the prostaglandin signal behind cramps.5 That is why it has been tested in women with painful periods and PMS for more than 30 years.
Does magnesium help period cramps?
Can taking magnesium help with period cramps?
Yes, in several trials it did. In a 2024 trial of 60 students with moderate to severe period pain, 300 mg of magnesium a day reduced cramps, back pain and other period symptoms compared with a placebo, and worked better than 150 mg. Older trials found similar relief, especially on the second and third days of bleeding.
Here is what the studies of magnesium for period cramps found, in plain words:
- The newest trial (Iran, 2024). 60 college students took 150 mg or 300 mg of magnesium a day, or a placebo, from the middle of one cycle to the next. Both doses reduced period symptoms compared with placebo, and the 300 mg dose did more for cramps, back pain, headache, low mood and irritability.6
- A Swiss trial (1990). Women took magnesium from the day before their period through day 2. Lower-belly and back pain eased more than with placebo on days 2 and 3, and fewer days were missed from work.7
- A German trial (1989) also reported magnesium as a useful option for primary period pain.8
- Magnesium with calcium (2017). In a three-arm trial in students, calcium with 300 mg of magnesium eased pain more than calcium alone.9
- Pain fell cycle by cycle. In an Italian study, first-day pain kept falling over several cycles of magnesium.10
A review of magnesium in gynaecology concluded that magnesium supplementation is effective in preventing period pain.5 The honest picture is that most trials were small, so magnesium is best seen as a daily habit that may make cramps milder over a few cycles, alongside heat and your doctor’s advice on painkillers, not as an instant painkiller.
Does magnesium help PMS?
Does magnesium help PMS?
It may, especially for PMS mood swings and bloating. In an Italian trial, 360 mg of magnesium a day eased premenstrual mood symptoms more than a placebo, and in a British trial 200 mg a day reduced bloating, breast tenderness and swelling by the second cycle. Results across all trials are mixed, so give it two to three cycles.
The trials on magnesium for PMS point to three kinds of symptoms:
- Mood. 32 women with PMS took 360 mg of magnesium a day from day 15 of their cycle until their period. Their overall symptom score and low mood eased more than with placebo.11 In another trial of 250 mg of magnesium, symptoms fell in every group, and fell most with magnesium plus vitamin B6.12
- Bloating and fluid retention. 38 women took 200 mg of magnesium a day. By the second cycle, weight gain, swelling, breast tenderness and bloating fell more than with placebo.13
- Anxiety and tension. Magnesium with 50 mg of vitamin B6 reduced anxiety-related PMS symptoms, such as nervous tension, compared with placebo.14
A review of magnesium and anxiety found positive results in 4 of 7 PMS studies.15 A larger 2024 review of nutrition trials found the evidence for magnesium on its own too mixed to be sure, while calcium had the most consistent results.16 Blood tests don’t settle it either: across 13 studies, women with PMS did not have clearly lower blood magnesium, though blood levels are a poor guide to the magnesium stored in your body.17 The fair conclusion: magnesium is a low-risk thing to try for PMS, and the trials suggest giving it time.
How much magnesium for period cramps and PMS?
How much magnesium should I take for period cramps?
The trials used about 200 to 360 mg of magnesium a day, and 300 mg worked better than 150 mg in the newest one. India’s daily need for women is 370 mg from food and supplements together, so about 250 to 300 mg from a supplement, taken every day, fits well for most women.
When people ask how much magnesium for period cramps they need, the numbers in the table below are the best guide. Always read the elemental magnesium on a label, not the weight of the salt: 3,667 mg of magnesium bisglycinate gives 440 mg of magnesium.
| Trial | Magnesium a day | When it was taken | What eased |
|---|---|---|---|
| Period pain, 2024 (60 students) | 150 or 300 mg | From mid-cycle to the next period | Cramps, back pain, mood; 300 mg more6 |
| Period pain, 1990 | About 365 mg (15 mmol) | Day before the period to day 2 | Belly and back pain on days 2–37 |
| PMS mood, 1991 (32 women) | 360 mg | Day 15 to the period | Total score and low mood11 |
| PMS bloating, 1998 (38 women) | 200 mg | Daily, two cycles | Bloating, swelling, breast tenderness in cycle 213 |
| PMS, 2010 | 250 mg (with or without B6) | Two cycles | Symptoms fell in all groups; most with B612 |
When in my cycle should I take magnesium?
Most trials started magnesium around day 15 of the cycle (about two weeks after your period starts) and continued until the period. In everyday life, taking it every day is simpler and keeps your intake steady through the whole month. The benefit built up over cycles in the trials, so judge it after two to three cycles, not one.13,10 Track your cramps and mood in a period app so you can see the difference.
What magnesium is best for PMS cramps?
What magnesium is best for PMS cramps?
The best magnesium for PMS cramps is one you can take daily without stomach upset. Magnesium glycinate is a gentle, well-absorbed form that doesn’t act as a laxative. Magnesium oxide is cheap but loosens stools at higher doses. Pick a label that states the elemental magnesium in mg.
The trials used several forms, including oxide, aspartate, pyrrolidone carboxylate and stearate. No form has been proven best for periods in a head-to-head trial, so the choice comes down to comfort and absorption.18 That is where magnesium glycinate for period cramps makes sense: magnesium bound to glycine is fully reacted, easy on the stomach, and doesn’t pull water into the gut the way oxide and citrate do, so it suits taking every day of the month. Each 440 mg of magnesium as bisglycinate also brings about 2.7 g of glycine, an amino acid studied for sleep.
Use this checklist to find the best magnesium for PMS on any shelf: the elemental magnesium in mg per serving; the form named on the label (“magnesium bisglycinate” or “magnesium glycinate”, not just “magnesium”); no hidden magnesium oxide; a serving that stays within your daily need; and an FSSAI licence number. Our guide to the best form of magnesium compares every common form.
Magnesium with B6, calcium, heat and ginger
Which supplement is best for period cramps?
Magnesium, ginger and heat have the best support for period cramps among simple home options. For PMS, calcium has the strongest trial evidence, and magnesium with vitamin B6 helped mood in some trials. Painkillers your doctor recommends work fastest for cramps on the day; supplements work slowly over cycles.
- Vitamin B6. Two trials paired magnesium with B6 (40 and 50 mg) and saw the biggest mood benefit.12,14 Some regulators ask for nerve warnings on long-term B6 above 10 mg a day, so higher doses are for a doctor to advise.
- Calcium. In a large US trial of 466 women, 1,200 mg of calcium a day cut PMS symptoms by 48% by the third cycle, compared with 30% on placebo.19 Milk, curd, paneer, ragi and til are good food sources.
- Heat. A hot-water bag or heat pad on the lower belly eased period pain in trials, and is one of the simplest things to try.20,2
- Ginger. Four placebo-controlled trials found that 750 to 2,000 mg of ginger powder in the first three to four days of the period reduced pain.21
- Movement and habits. Gentle exercise such as walking or yoga, and cutting down on alcohol and smoking, can also help.1
Magnesium-rich foods for your cycle
How do I raise my magnesium level quickly?
There is no instant fix, but you can raise your daily intake from today. Add magnesium-rich foods such as pumpkin seeds, rajgira, almonds, ragi and soya to every meal, and, if your diet falls short, take a supplement close to your daily need. Body stores build up over weeks. Very low blood magnesium is treated by a doctor.
Food comes first. A handful of these each day, from Indian food tables, goes a long way towards the 370 mg women need:22,23
| Food | Serving | Magnesium |
|---|---|---|
| Pumpkin seeds | 28 g (a small handful) | About 156 mg |
| Rajgira (amaranth) | 30 g (a laddoo or porridge) | 98 mg |
| Almonds | 28 g (a handful) | 89 mg |
| Ragi flour | 60 g (2 rotis or a dosa) | 88 mg |
| Soya bean | 30 g dry (a katori cooked) | 78 mg |
| Whole wheat atta | 60 g (2 rotis) | 75 mg |
Polished white rice gives only about 11 mg in a plate, so swapping some rice for millets or whole wheat adds up. See the full list in magnesium-rich foods in India, and check how much magnesium per day you need.
Who should not take magnesium, and when to see a doctor
Who should not take magnesium?
People with kidney disease should take magnesium only on a doctor’s advice, because weak kidneys can’t clear the extra. Pregnant or breastfeeding women and anyone on regular medicines, such as thyroid tablets, certain antibiotics, bone medicines or long-term acid reducers, should check with their doctor about timing and dose first.
Magnesium from supplements can loosen stools, especially oxide and citrate. Keep it about 4 hours away from thyroid tablets, at least 2 hours from bone (bisphosphonate) tablets, and 2 hours before or 4 to 6 hours after tetracycline or quinolone antibiotics. Read more in magnesium and medicines.
Period pain is severe, getting worse, or not helped by painkillers; your periods become heavier or irregular; you bleed between periods; you have pain during sex or when passing urine or stools; or period pain starts after years of easy periods. These can be signs of endometriosis, fibroids or infection.1,2 Get help urgently for sudden severe pain, fever with pelvic pain, or pain with a late period if you are sexually active.2 Very heavy periods can also drain your iron; ask about a ferritin test. If PMS brings very low mood or thoughts of self-harm, speak to a doctor promptly.
How to try magnesium for period cramps and PMS
- Rule out other causes firstIf your periods are very painful, heavy or have changed, see a doctor before trying supplements.1
- Fill the gap with foodAdd seeds, nuts, millets and dals daily to move towards the 370 mg women need.23
- Choose a gentle magnesiumPick a glycinate that states the elemental magnesium in mg and an FSSAI licence.
A calmer cycle starts with the right magnesium.
Gentle on the stomach, clearly dosed and made for every day of the month, so you can give magnesium the two to three cycles the trials suggest.
Magnesium Glycinate by Evo Hominus™
Launching first. 100% non-buffered magnesium glycinate: 440 mg of magnesium from 3,667 mg of fully reacted bisglycinate, with about 2.7 g of glycine and zero oxide. Women can take two tablets, about 293 mg, right in the range the period trials used. Magnesium contributes to normal muscle function, normal psychological function and the reduction of tiredness and fatigue.
See Magnesium Glycinate →Nutrient Gap Finder
Answer a few quick questions about your food, periods, sleep and mood to see which nutrients you may be short of, including magnesium and iron, and which tests to ask your doctor about.
Try the Nutrient Gap Finder →Bioactive Multivitamin
Coming soon. Our daily multivitamin is in development. Join the waitlist to hear first when it launches.
Join the waitlist →Claims are ingredient-based and not specific to any product.
- Most period and PMS trials of magnesium were small (often 30 to 60 women), many were run in one country, and several are decades old. Reviews rate the overall evidence as limited.15,16
- The 2024 trial used magnesium stearate in students with moderate to severe period pain; the abstract does not give exact score changes.6 The 1990 trial analysed 21 of 32 women and gave magnesium aspartate for three days each cycle.7
- The 1991 PMS trial used 360 mg, a little more than two of our tablets; pain eased in both its magnesium and placebo groups, and the clearer difference was in mood.11 The bloating trial found no difference in the first cycle.13
- The vitamin B6 trials used 40 and 50 mg of B6 a day, well above the 10 mg level at which some regulators ask for nerve warnings on long-term use.12,14
- The magnesium-with-calcium trial compared it with calcium alone, not with magnesium alone. The Italian cycle-by-cycle study had no placebo group.9,10
- The calcium trial gave 1,200 mg a day for three cycles. The ginger trials used 750 to 2,000 mg of powder only on the first three to four days of the period.19,21
- The Indian prevalence figures come from a review of separate local studies with different methods, so the ranges are wide.3
Magnesium and your period, answered simply.
What magnesium is best for PMS cramps?
Can taking magnesium help with period cramps?
How much magnesium should I take for period cramps?
Does magnesium help PMS?
What are the 7 signs your body needs magnesium?
Which magnesium is best for female hormones?
What do Koreans use for period cramps?
What are the first signs of low magnesium?
What organ is most affected by magnesium?
How do I raise my magnesium level quickly?
Can magnesium affect your period?
Who should not take magnesium?
Which supplement is best for period cramps?
Does magnesium help period cramps?
Can magnesium help PMS mood swings?
How much magnesium for PMS?
Should I take magnesium and B6 together for PMS?
When should I start taking magnesium for PMS?
How long does magnesium take to work for period cramps?
Can I take magnesium during my period?
Can I take magnesium with ibuprofen or mefenamic acid?
Is magnesium glycinate good for period cramps?
Does magnesium help PMS bloating?
Is calcium or magnesium better for PMS?
Do PMS chocolate cravings mean low magnesium?
Can magnesium help heavy periods?
Is it safe to take magnesium every day for PMS?
Does magnesium help period headaches?
Studies behind this guide
- NHS (UK National Health Service). Period pain. nhs.uk — causes, self-care (heat, exercise, painkillers) and when to see a GP.
- MedlinePlus (US National Library of Medicine). Painful menstrual periods — prostaglandins, primary and secondary dysmenorrhoea, home care and when to contact a provider.
- Das P, Jungari S. Prevalence, risk factors and health-seeking behavior of menstrual disorders among women in India: a review of two-decade evidence. Glob Health Action. 17(1):2433331 (published 2025).
- European Commission. Regulation (EU) No 432/2012 establishing a list of permitted health claims made on foods (magnesium).
- Parazzini F, Di Martino M, Pellegrino P. Magnesium in the gynecological practice: a literature review. Magnes Res. 2017;30(1):1–7. DOI 10.1684/mrh.2017.0419 PMID 28392498
- Yaralizadeh M, Nezamivand-Chegini S, Najar S, Namjoyan F, Abedi P. Effectiveness of magnesium on menstrual symptoms among dysmenorrheal college students: a randomized controlled trial. Int J Womens Health Reprod Sci. 2024;12(2):70–76. DOI 10.15296/ijwhr.2023.25
- Fontana-Klaiber H, Hogg B. Therapeutic effects of magnesium in dysmenorrhea [in German]. Schweiz Rundsch Med Prax. 1990;79(16):491–4. PMID 2349410
- Seifert B, et al. Magnesium — a new therapeutic alternative in primary dysmenorrhea [in German]. Zentralbl Gynakol. 1989;111(11):755–60. PMID 2675496
- Mohammad-Alizadeh-Charandabi S, et al. Calcium with and without magnesium for primary dysmenorrhea: a double-blind randomized placebo-controlled trial. Int J Womens Health Reprod Sci. 2017; as summarised in Saei Ghare Naz M, Kiani Z, Rashidi Fakari F, Ghasemi V, Abed M, Ozgoli G. The effect of micronutrients on pain management of primary dysmenorrhea: a systematic review and meta-analysis. J Caring Sci. 2020;9(1):47–56. DOI 10.34172/jcs.2020.008
- Benassi L, Barletta FP, Baroncini L, et al. Effectiveness of magnesium pidolate in the prophylactic treatment of primary dysmenorrhea. Clin Exp Obstet Gynecol. 1992;19(3):176–179.
- Facchinetti F, Borella P, Sances G, Fioroni L, Nappi RE, Genazzani AR. Oral magnesium successfully relieves premenstrual mood changes. Obstet Gynecol. 1991;78(2):177–81. PMID 2067759
- Fathizadeh N, Ebrahimi E, Valiani M, Tavakoli N, Yar MH. Evaluating the effect of magnesium and magnesium plus vitamin B6 supplement on the severity of premenstrual syndrome. Iran J Nurs Midwifery Res. 2010;15(Suppl 1):401–5. PMID 22069417
- Walker AF, De Souza MC, Vickers MF, Abeyasekera S, Collins ML, Trinca LA. Magnesium supplementation alleviates premenstrual symptoms of fluid retention. J Womens Health. 1998;7(9):1157–65. PMID 9861593
- De Souza MC, Walker AF, Robinson PA, Bolland K. 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. J Womens Health Gend Based Med. 2000;9(2):131–9. PMID 10746516
- Boyle NB, Lawton C, Dye L. The effects of magnesium supplementation on subjective anxiety and stress — a systematic review. Nutrients. 2017;9(5):429. DOI 10.3390/nu9050429
- Robinson J, Ferreira A, Iacovou M, Kellow NJ. Effect of nutritional interventions on the psychological symptoms of premenstrual syndrome in women of reproductive age: a systematic review of randomized controlled trials. Nutr Rev. 2025;83(2):280.
- Moslehi M, Arab A, Shadnoush M, Hajianfar H. The association between serum magnesium and premenstrual syndrome: a systematic review and meta-analysis of observational studies. Biol Trace Elem Res. 2019;192(2):145–152. PMID 30880352
- Fiorentini D, Cappadone C, Farruggia G, Prata C. Magnesium: biochemistry, nutrition, detection, and social impact of diseases linked to its deficiency. Nutrients. 2021;13(4):1136. DOI 10.3390/nu13041136
- Thys-Jacobs S, Starkey P, Bernstein D, Tian J. Calcium carbonate and the premenstrual syndrome: effects on premenstrual and menstrual symptoms. Am J Obstet Gynecol. 1998;179(2):444–52. PMID 9731851
- Jo J, Lee SH. Heat therapy for primary dysmenorrhea: a systematic review and meta-analysis of its effects on pain relief and quality of life. Sci Rep. 2018;8. DOI 10.1038/s41598-018-34303-z PMID 30389956
- Daily JW, Zhang X, Kim DS, Park S. Efficacy of ginger for alleviating the symptoms of primary dysmenorrhea: a systematic review and meta-analysis of randomized clinical trials. Pain Med. 2015;16(12):2243–55. DOI 10.1111/pme.12853
- Longvah T, Ananthan R, Bhaskarachary K, Venkaiah K. Indian Food Composition Tables 2017. Hyderabad: National Institute of Nutrition (ICMR); 2017.
- ICMR-NIN. Nutrient Requirements for Indians, 2020 — magnesium RDA 370 mg a day for adult women (440 mg in pregnancy).