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Magnesium for PMS and PMDD: does it really work?
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Summary
Magnesium supports serotonin function, muscle relaxation, and stress regulation - easing cramps, anxiety, and irritability before your period. Clinical trials show it significantly reduces premenstrual mood changes, fluid retention, and cramping. The form you choose matters, and the combination with vitamin B6 is particularly well supported by research.
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🌿 Key takeaways
Magnesium for PMS and PMDD: what to know
- Magnesium is involved in over 300 enzyme reactions, including many directly relevant to PMS and PMDD: stress regulation, serotonin production, muscle relaxation, and hormonal signalling
- Clinical trials show magnesium significantly reduces premenstrual mood changes, anxiety, fluid retention, and cramping
- It works even better when combined with vitamin B6 - studies show enhanced benefits for anxiety-related PMS symptoms
- The form of magnesium matters - citrate and bisglycinate are among the most bioavailable and well-tolerated forms
- Evelyn uses a combination of magnesium citrate and magnesium bisglycinate totalling 280 mg per serving
- Here are some of our recommended reads if you would like to learn more:
- Magnesium supplementation alleviates premenstrual symptoms of fluid retention (Walker et al., 1998)
- Oral magnesium successfully relieves premenstrual mood changes (Facchinetti et al., 1991)
- Magnesium plus vitamin B6 for PMS: an RCT (De Souza et al., 2000)
- Evaluating the effect of magnesium and magnesium plus vitamin B6 on PMS (Fathizadeh et al., 2010)
What is magnesium?
Magnesium is an essential mineral involved in over 300 biochemical reactions in the body. It plays a key role in energy production, protein synthesis, muscle and nerve function, blood sugar regulation, and hormone metabolism. It is found naturally in pumpkin seeds, almonds, spinach, avocado, and dark chocolate.
Many people do not get enough magnesium from diet alone. Stress, alcohol, and certain medications can all deplete levels further. People with PMS and PMDD have been found to have lower magnesium levels than those without, particularly in the luteal phase.
Magnesium supports serotonin function and muscle relaxation, helping calm the body, ease cramps, and reduce irritability before your period. Evelyn's formula combines magnesium citrate and bisglycinate for optimal absorption and gentle digestion.
🌿 Fun fact: You would need to eat around 25 avocados every single day to match the magnesium in one Evelyn serving.
Does magnesium really help with PMS and PMDD?
Yes, and the clinical evidence is solid. Multiple randomised controlled trials conducted specifically in PMS populations have shown that magnesium supplementation significantly reduces symptom severity across multiple clusters - including mood changes, anxiety, fluid retention, and cramping.
If your symptoms are more focused on mood specifically, it is worth also reading about vitamin B6 and saffron, which have particularly strong evidence for mood-related PMS and PMDD symptoms when combined with magnesium.
Mood: irritability, anxiety, and low mood before your period
Magnesium plays a key role in regulating the HPA axis (the body's stress response system) and in the production and function of serotonin and GABA. When magnesium levels are low, the nervous system becomes more reactive and the stress response more easily triggered.
- Magnesium supports serotonin synthesis and receptor function
- It supports GABA activity, which calms the nervous system and reduces anxiety
- Low magnesium is associated with increased sensitivity to stress, anxiety, and irritability in the luteal phase
🧪 What the science says: A double-blind, randomised, placebo-controlled trial by Facchinetti et al. (1991), published in Obstetrics and Gynecology, found that oral magnesium supplementation significantly reduced premenstrual mood changes over two menstrual cycles compared to placebo, with particular benefits for mood-related symptoms.
Physical: cramps, muscle tension, and fluid retention
Magnesium is essential for normal muscle contraction and relaxation. It acts as a natural calcium antagonist, helping muscles relax after contraction. In the luteal phase, low magnesium contributes to increased muscle tension and uterine cramping.
- Magnesium supports the relaxation of smooth muscle, including the uterus, which may reduce cramping severity
- It helps regulate prostaglandins, the chemicals that drive uterine contractions and pain
- Adequate magnesium supports fluid balance and reduces water retention commonly experienced before a period
🧪 What the science says: A double-blind, randomised, placebo-controlled trial by Walker et al. (1998), published in the Journal of Women's Health, found that magnesium supplementation significantly alleviated premenstrual symptoms of fluid retention including bloating, breast tenderness, and weight gain compared to placebo over two cycles.
Magnesium and vitamin B6 combined
The combination of magnesium and vitamin B6 is one of the most well-studied nutritional approaches for PMS and PMDD, with clinical research showing enhanced benefits compared to either alone.
- Vitamin B6 supports magnesium uptake into cells, enhancing its effectiveness
- Combined supplementation produces stronger reductions in anxiety-related symptoms than magnesium or B6 alone
- Both are included together in Evelyn's Revive formula and PMS Bar for this reason
🧪 What the science says: A randomised, double-blind, crossover study by De Souza et al. (2000), published in the Journal of Women's Health, found that one month of daily supplementation with 200 mg magnesium plus 50 mg vitamin B6 produced significantly greater reductions in anxiety-related PMS symptoms - including nervous tension, mood swings, irritability, and anxiety - compared to magnesium alone or placebo.
Sleep: disruption before your period
Poor sleep is one of the most commonly reported but least discussed PMS and PMDD symptoms. Magnesium plays a direct role in sleep regulation through its effects on GABA and melatonin.
- Magnesium supports GABA activity, which is essential for initiating and maintaining sleep
- It helps regulate cortisol levels, which can be elevated in the luteal phase and disrupt sleep quality
- Low magnesium is associated with lighter, less restorative sleep
⚠️ Worth noting: The evidence for magnesium and sleep specifically in PMS and PMDD populations is less direct than for mood and cramps. The biological mechanisms are well supported, but we will continue to update this page as more PMS-specific evidence is released.
How does magnesium work in the body?
Magnesium acts as a cofactor for hundreds of enzyme reactions and as a physiological calcium antagonist, regulating the balance between excitatory and inhibitory signals throughout the body. In the context of PMS and PMDD, its most important roles are in neurotransmitter regulation, muscle function, stress hormone regulation, and prostaglandin metabolism.
🧠 In simple terms: Think of magnesium as a natural calming mineral. When levels are adequate, the nervous system stays balanced, muscles relax properly, and the stress response is regulated. When levels drop - which is more likely in the luteal phase - everything becomes more reactive. Cramps intensify, anxiety spikes more easily, sleep is harder to come by, and mood becomes harder to stabilise. Supplementing magnesium helps bring the system back into balance.
Neurological pathway
Magnesium regulates NMDA receptors, which control the brain's excitatory activity. It also supports the production and function of serotonin and GABA. When magnesium levels are adequate, the nervous system operates calmly and efficiently. When levels drop, excitatory activity increases and mood, anxiety, and sleep are all affected.
Muscle pathway
Magnesium acts as a physiological calcium antagonist - it counterbalances calcium's role in triggering muscle contraction. Without adequate magnesium, muscles including the uterus contract more easily and relax less effectively, leading to increased cramping and tension.
Hormonal pathway
Magnesium regulates the HPA axis, which controls cortisol and other stress hormones. It also influences oestrogen and progesterone metabolism and helps regulate prostaglandin production, which is directly linked to menstrual pain and fluid retention.
Absorption pathway
Vitamin B6 supports the transport of magnesium into cells, which is why the combination is more effective than magnesium alone. Evelyn uses both in Revive and the PMS Bar specifically for this reason.
What does the research say?
Magnesium has one of the most directly relevant and well-replicated evidence bases of any nutritional supplement for PMS, with multiple RCTs conducted specifically in PMS populations across several decades.
| Study | Dose / Duration | Key finding |
|---|---|---|
| Facchinetti et al. RCT, Obstet Gynecol (1991) | 360 mg magnesium daily / 2 cycles | Significant reduction in premenstrual mood changes including anxiety and depression vs placebo |
| Walker et al. RCT, J Womens Health (1998) | 200 mg magnesium daily / 2 cycles | Significant alleviation of fluid retention symptoms including bloating and breast tenderness vs placebo |
| De Souza et al. RCT, J Womens Health (2000) | 200 mg magnesium + 50 mg B6 daily / 1 cycle | Significantly greater reduction in anxiety-related PMS symptoms vs magnesium alone or placebo |
| Fathizadeh et al. RCT, Iran J Nurs Midwifery Res (2010) | Magnesium or magnesium + B6 / 2 cycles | Significant decrease in PMS symptom scores across all treatment groups; magnesium plus B6 showed the greatest effect |
| Whelan et al. systematic review, Can J Clin Pharmacol (2009) | Varied | Magnesium identified as having supporting evidence for PMS, particularly for mood and fluid retention |
🧠 Strongest evidence for: mood changes, anxiety, and irritability in PMS (direct RCT evidence); fluid retention and bloating (direct RCT evidence). Cramping is supported by mechanism and general magnesium research. Sleep disruption is biologically plausible but less directly evidenced in PMS trials.
⚠️ Worth noting: Most individual studies are small, which is typical for nutritional PMS research. The consistency of direction across multiple independent RCTs strengthens the overall picture despite modest sample sizes. Evidence specifically in PMDD populations is more limited than in PMS.
A Good rating means there are clinical trials showing positive results, but the evidence is not yet as extensive or consistent as our Strong-rated ingredients. For magnesium, there are multiple RCTs directly in PMS populations showing consistent benefits for mood, fluid retention, and anxiety. The combination with vitamin B6 is particularly well supported. More large-scale trials would further strengthen the evidence base.
Magnesium dosage for PMS and PMDD: how much should you take?
How much? Evelyn's Revive formula and PMS Bar each contain a total of 280 mg of magnesium per serving, provided as a combination of magnesium citrate (210 mg) and magnesium bisglycinate (70 mg). This sits within the range used in clinical studies for PMS, which typically use 200 to 360 mg elemental magnesium per day.
Why two forms of magnesium? Magnesium citrate and magnesium bisglycinate are among the most bioavailable forms. Each has slightly different characteristics:
- Magnesium citrate - well absorbed and particularly effective for muscle relaxation and fluid balance
- Magnesium bisglycinate - bound to the amino acid glycine, which further enhances absorption and is gentle on digestion
When to take it? Magnesium is included in both Revive and the PMS Bar, designed for the luteal phase. It is also perfectly fine to take daily throughout the full cycle. Consistent daily use supports stable levels and maximises benefit, particularly for mood and nervous system support.
With or without food? Magnesium can be taken with or without food, though taking it with a meal tends to improve tolerability and may slightly enhance absorption.
|
🤝 Pairs well with Vitamin B6 and calcium Clinical research shows the magnesium and B6 combination produces significantly greater reductions in anxiety-related PMS symptoms than either alone. Calcium works alongside magnesium in muscle function and nerve signalling. All three are present across the Evelyn Routine. |
✅ Tips Consistency is key Best taken consistently each day rather than only before your period. Do not exceed 400 mg elemental magnesium per day from supplements without medical supervision. |
How to buy good quality magnesium
If you are buying magnesium from another brand, here is exactly what matters. Magnesium comes in many forms, which means quality and effectiveness can vary significantly between products.
1. Choose well-absorbed forms
Magnesium citrate and magnesium bisglycinate are among the most bioavailable forms. Lower-quality forms such as magnesium oxide are cheaper but poorly absorbed and more likely to cause digestive side effects. Always check which form is listed on the label.
2. Check elemental magnesium content
The total magnesium compound listed on a label is not the same as elemental magnesium, which is the amount your body actually uses. Without the elemental figure, it is difficult to compare products or know whether you are getting a meaningful dose.
3. Be cautious of high-dose single forms
Large doses of certain forms, particularly oxide or citrate alone, can cause diarrhoea. Well-formulated products tend to balance absorption with tolerability by using a combination of forms, as Evelyn does.
4. Ask about testing and purity
Magnesium should be tested for heavy metals and contaminants. Reputable brands will provide a Certificate of Analysis and clear sourcing information.
5. Check the dose
Clinical studies in PMS typically use doses of 200 to 360 mg elemental magnesium per day. Be cautious of products using much lower doses, or products that do not clearly state elemental magnesium content.
💡 What Evelyn uses: Evelyn uses a combination of magnesium citrate and magnesium bisglycinate totalling 280 mg per serving in both Revive and the PMS Bar, to balance absorption and tolerability. The dose is aligned with clinical evidence. Every batch is tested for purity, potency, and contaminants, and we work with suppliers who provide full documentation.
What to be mindful of
Magnesium is considered safe for most people at the doses used in Evelyn's formula. Side effects at 280 mg per day are uncommon, though some people experience mild digestive discomfort, particularly with poorly tolerated forms like magnesium oxide. The combination of citrate and bisglycinate in Evelyn's formula is specifically chosen for its gentleness on digestion.
At higher supplemental doses (typically above 400 mg per day), magnesium can cause loose stools or diarrhoea.
Speak to your GP before supplementing if you are:
- Living with kidney disease or impaired kidney function
- Taking antibiotics (particularly tetracyclines or fluoroquinolones)
- Taking diuretics, proton pump inhibitors, or medications for heart conditions
- Pregnant or breastfeeding and considering doses above standard recommendations
How long does magnesium take to work?
Magnesium works by building and maintaining adequate tissue levels over time. Some people notice changes relatively quickly, while others see more gradual improvements across multiple cycles.
|
Days 1–14 |
Tissue magnesium levels begin to rise with consistent daily supplementation. Some people notice subtle reductions in tension or improved sleep relatively quickly. |
|
Cycle 1 |
Some people notice improvements in mood stability, reduced cramping, or less fluid retention before their period. |
|
Cycle 2+ |
Most people who respond to magnesium report clearer and more consistent improvements, particularly when taken alongside vitamin B6. |
📅 How to track your progress: Use The Evelyn Premenstrual Health Tracker to log how you feel in the 10 days before each period. Note breast tenderness, mood, bloating, and irritability. This gives you a clear picture of whether things are shifting.
How it fits in the Evelyn formula
Magnesium (as citrate and bisglycinate) is a key ingredient in both Evelyn's Revive shake and the Evelyn PMS Bar, giving you the option of daily support or targeted support in the days before your period.
We chose this combination of magnesium forms because:
- Citrate and bisglycinate are among the most bioavailable and well-tolerated magnesium forms
- The combined 280 mg dose sits within the range used in clinical PMS trials
- It is combined with vitamin B6 in the same formula, reflecting the clinical evidence that the two work better together
- It works best with consistent daily use, fitting the design of the Evelyn Routine
"We use a combination of magnesium citrate and bisglycinate in Revive and the PMS Bar, totalling 280 mg per serving. Both forms are chosen for their bioavailability and tolerability. Magnesium is combined with vitamin B6 because the research shows the combination works better than either alone. Every ingredient in our formula is purposeful, and this one is no exception."
Should you try magnesium for PMS and PMDD? 💡
Magnesium may be worth prioritising if your PMS or PMDD includes:
- Cramps or muscle tension that worsens before your period
- Anxiety, irritability, or mood changes in the luteal phase
- Fluid retention or bloating before your period
- Poor sleep or difficulty switching off in the days before your period
- Fatigue that feels linked to tension or nervous system reactivity
It is a particularly good fit for almost anyone with PMS or PMDD, given the breadth of symptoms it addresses and the strength of the clinical evidence. It works especially well alongside vitamin B6, calcium, and vitamin D.
"If you only start with one supplement for PMS or PMDD, magnesium is one of the strongest candidates. The clinical evidence is direct and consistent, it addresses multiple symptoms at once, and the combination with vitamin B6 in the Evelyn Routine is specifically supported by clinical research. The form you choose matters - look for citrate or bisglycinate, not oxide."
References
- 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):131–139.
- Facchinetti F, Borella P, Sances G, Fioroni L, Nappi RE, Genazzani AR. Oral magnesium successfully relieves premenstrual mood changes. Obstet Gynecol. 1991;78(2):177–181.
- 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):401–405.
- 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):1157–1165.
- Whelan AM, Jurgens TM, Naylor H. Herbs, vitamins and minerals in the treatment of premenstrual syndrome: a systematic review. Can J Clin Pharmacol. 2009;16(3):e407–e429.
Disclaimer: This article is for information only and is not intended as medical advice. Always speak to a qualified healthcare professional about any health concerns.
