Magnesium: A Powerful Ally for PMS Relief

Sudden irritability, overwhelming fatigue, uncontrollable sugar cravings, cramps in your lower abdomen… If any of this sounds familiar in the days before your period, you are far from alone. Up to 80% of women experience at least one premenstrual symptom during their lifetime, and around 20–30% live with PMS that is significant enough to affect their daily lives. In some cases, symptoms can become genuinely debilitating.

Among the most studied natural approaches to easing these symptoms, magnesium stands out. This mineral is involved in more than 300 enzymatic reactions in the body, and plays a central role in regulating the nervous system, muscle contraction, and hormonal wellbeing — in other words, precisely the areas where PMS tends to wreak havoc.

In this article, we explain why magnesium can help, how to choose the right form, and which habits to adopt to feel a little more like yourself in the lead-up to your period.

Why is my PMS so intense?

To understand why your PMS feels so overwhelming, we need to look at what is happening in your body during the second half of your cycle — known as the luteal phase.

After ovulation, levels of oestrogen and progesterone fluctuate significantly. These hormonal shifts directly influence your brain chemistry, particularly the production of serotonin (the neurotransmitter that regulates mood) and GABA (which promotes calm and relaxation). When these two chemical messengers drop towards the end of the cycle, irritability, anxiety and sleep disturbances can set in.

Magnesium comes into play here because it is directly involved in the production of these neurotransmitters. Studies have shown that women with PMS have significantly lower intracellular magnesium levels (measured in red blood cells and mononuclear cells) compared to women without PMS. This cellular deficiency may heighten the nervous system’s sensitivity to hormonal fluctuations.

It is also worth knowing that after the age of 35, hormonal fluctuations tend to become more erratic as the body moves towards perimenopause. This is why many women notice their PMS intensifying with age, even if it was manageable in their twenties. Maintaining good magnesium levels may help to soften these variations.

If you want to understand exactly what PMS is and how to recognise the symptoms, read our full guide: Premenstrual Syndrome (PMS): How to Recognise the Symptoms

9 signs you may be low in magnesium

Your body is a complex machine that sends subtle signals — and learning to decode them can help you better understand your needs. Signs of magnesium deficiency are often low-level and easy to confuse with ‘normal’ tiredness. A standard blood test (serum magnesium) does not accurately reflect your true reserves, since magnesium is primarily stored inside your cells rather than in the bloodstream.

Here are some common signs to look out for. If you recognise several of them, magnesium is worth exploring:

• Twitching eyelid (fasciculations) for no apparent reason

• Persistent fatigue, even after a full night’s sleep

• Muscle cramps, particularly in the legs or feet

• Disproportionate irritability or mood swings

• Anxiety or a constant sense of nervous tension

• Sleep disturbances (difficulty falling asleep, waking in the night)

• Frequent headaches, especially in the premenstrual phase

• Dizziness or light-headedness

• Intense chocolate cravings: a common theory suggests the body intuitively seeks magnesium through these cravings. In reality, chocolate also contains sugar and fat, which makes this explanation overly simplistic. That said, if you notice these cravings towards the end of your cycle, it may be worth checking your magnesium status.

Chronic stress, an unbalanced diet, excess alcohol or caffeine, and certain hormonal contraceptives can all worsen this deficiency. If you recognise several of these signs and your PMS is noticeable, it is worth discussing magnesium with your GP.

�� Magnesium deficiency isn’t just about diet

We often assume magnesium deficiency comes purely from not eating enough of it. But there is also a phenomenon called urinary magnesium loss. When you are under chronic stress, your body produces cortisol continuously, which increases the kidneys’ elimination of magnesium. The more stressed you are, the more magnesium you lose — and the lower your magnesium, the more sensitive you become to stress. It is a vicious cycle. This is why some women remain deficient despite eating a balanced diet.

The 4 key ways magnesium helps with PMS symptoms

Magnesium is not simply an ‘anti-stress’ supplement. It acts on several physiological mechanisms directly involved in PMS:

1. Supports mood stability

Magnesium acts as a natural modulator of brain activity. It potentiates the action of GABA — the brain’s main inhibitory neurotransmitter — by binding to GABA-A receptors, promoting a sense of calm and reducing neural over-excitability. At the same time, magnesium blocks NMDA receptors for glutamate (the excitatory neurotransmitter), which limits over-stimulation of the nervous system. This dual mechanism explains why adequate magnesium levels help to reduce anxiety, irritability and mood swings that are so characteristic of the premenstrual phase.

2. Helps ease cramps and discomfort

Magnesium is a natural muscle relaxant. It works by regulating the flow of calcium into muscle cells. When magnesium is insufficient, calcium enters cells in excess, causing prolonged and painful contractions. A double-blind clinical trial involving 60 female students found that taking 300 mg of magnesium from day 15 of the cycle significantly reduced cramps, abdominal discomfort and headaches compared to placebo.

3. Helps with water retention

Bloating and the sensation of swelling towards the end of your cycle are partly linked to water retention, which is influenced by aldosterone (a hormone that regulates fluid balance). Magnesium helps to modulate aldosterone secretion and thereby supports better fluid balance. One study found that supplementing with 200 mg of magnesium per day reduced water retention symptoms from the second cycle of supplementation onwards.

4. Supports energy levels

Magnesium is an essential cofactor in the production of ATP — the molecule that provides energy to all your cells. When your magnesium reserves are low, your energy metabolism slows down, resulting in that persistent fatigue you know so well towards the end of your cycle.

Beyond supplements: where to find magnesium in your diet

Before reaching for supplements, the first step is to try to boost your dietary intake. The European Food Safety Authority (EFSA) recommends a daily intake of 300 mg of magnesium for women, but research consistently shows this is rarely achieved through modern diets.

The best food sources of magnesium include nuts and seeds (almonds, cashews, Brazil nuts), dark chocolate (70% cacao or above), legumes (lentils, chickpeas), wholegrains, dark leafy greens (spinach, Swiss chard) and seafood. A handful of almonds (30 g) provides around 80 mg of magnesium.

That said, when PMS is established and symptoms are significant, diet alone is often not enough to address the deficiency. This is where supplementation becomes relevant — but not all forms of magnesium are equal.

The top 3 most bioavailable forms of magnesium

When choosing an effective magnesium, look for chelated organic forms — meaning magnesium bound to an amino acid or organic acid to improve absorption:

Magnesium bisglycinate

This is the gold-standard form for the nervous system. Magnesium is bound to two molecules of glycine, an amino acid with its own relaxing properties. Its bioavailability is among the highest and it is very well tolerated digestively. It is the ideal form for PMS as it acts on both nervous tension and sleep quality.

�� This is the form of magnesium we use at SOVA. 

Discover our Magnesium Bisglycinate, designed to support stress relief, improve sleep quality and help reduce fatigue in women with PCOS.

Magnesium malate

This form combines magnesium with malic acid, which plays a role in energy production (Krebs cycle). It is particularly well suited if fatigue is your dominant symptom.

If fatigue is one of your biggest struggles, you might also want to read: PCOS Extreme Fatigue: Why You're So Drained & 5 Steps to Reclaim Your Energy

Magnesium citrate

This form offers good bioavailability and may have a gentle beneficial effect on digestion. It is a good choice for women who experience constipation during the premenstrual phase.

The magnesium + vitamin B6 combination: why it works

You may have seen ‘Magnesium B6’ on supplements in pharmacies. This is no coincidence: vitamin B6 is an essential cofactor in the synthesis of serotonin and dopamine — two neurotransmitters directly involved in mood regulation and emotional wellbeing.

Several clinical trials confirm that the magnesium + B6 combination is more effective than magnesium alone for reducing PMS symptoms. The effect is particularly marked on the anxiety component. Beyond its role in neurotransmitter synthesis, B6 helps to support hormonal activity and participates in the metabolism of amino acids involved in menstrual cycle balance.

Do pay attention to the form of vitamin B6: the standard form (pyridoxine) needs to be converted by the liver before it becomes active. The P5P form (pyridoxal-5-phosphate), which is directly usable by the body, is preferable — and it is this form that is used in SOVA’s Magnesium.

How to ease PMS naturally: beyond magnesium

Magnesium is a cornerstone, but it does not work in isolation. Certain lifestyle habits make a real difference for broader PMS relief:

• Reduce your salt intake in the luteal phase. Salt encourages water retention and worsens bloating and the sensation of swelling.

• Limit refined sugar. Blood sugar spikes amplify cravings and destabilise mood. Opt for complex carbohydrates (sweet potato, brown rice, oats) to maintain steady blood sugar.

• Moderate your caffeine intake. Coffee stimulates cortisol (the stress hormone) and can worsen irritability and sleep disturbances. Try to limit yourself to one cup a day in the second half of your cycle, or swap it for a golden latte or green tea.

• Move, but gently. Moderate physical activity (walking, yoga, swimming, Pilates) encourages endorphin release and eases muscle tension. Avoid high-intensity exercise towards the end of your cycle, as this can actually raise cortisol.

• Prioritise sleep. Magnesium helps, but also think about limiting screen time in the evening, keeping your bedroom cool and dark, and establishing a consistent bedtime routine. Quality sleep is fundamental to hormonal wellbeing.

For a full overview of every treatment option available — from lifestyle changes to medical support — take a look at: Treatment for PMS and PMDD: A Step-by-Step Guide to Finding Relief

Which supplements to combine with magnesium?

Depending on the intensity of your symptoms, certain combinations can be beneficial:

• Chasteberry (Vitex agnus-castus) is a plant whose effectiveness for PMS has been assessed in several clinical trials. Women taking chasteberry are 2.5 times more likely to see a significant reduction in symptoms compared to placebo. It acts via dopaminergic receptors and helps to rebalance the oestrogen/progesterone ratio.

• Saffron is recognised for its soothing properties on mood and emotional stress. It acts on serotonin and may help to ease the emotional components of PMS.

• Omega-3s (EPA and DHA) have well-documented anti-inflammatory properties and may help to reduce the discomfort and inflammation associated with the menstrual cycle.

How to take magnesium for best results

• Dosage: Most studies on PMS use doses between 200 and 360 mg of elemental magnesium per day. SOVA Magnesium provides 300 mg per day (in 3 capsules), which sits within this range.

• Consistency: Magnesium works gradually. Some studies have shown improvements from the second cycle of supplementation. For lasting results, a course of at least 3 months is recommended.

• Timing: Ideally, split your doses across the day (for example, one capsule with each meal) to optimise absorption. Alternatively, you can take them in the evening, as magnesium supports relaxation and sleep onset.

• Precautions: Magnesium bisglycinate is very well tolerated and generally has no laxative effect. There are no major contraindications, but note that magnesium can interfere with the absorption of certain medications if taken at the same time — notably certain antibiotics (tetracyclines and quinolones) and osteoporosis treatments (bisphosphonates). If you are taking any of these, leave at least 2 hours between your magnesium supplement and your medication. As always, if you are on any specific medical treatment, speak to your GP or pharmacist.

Severe PMS: when should you see a doctor?

PMS is a common condition, but it should never be dismissed. If your symptoms are very intense and are significantly disrupting your daily life, work or relationships, this may be Premenstrual Dysphoric Disorder (PMDD) — a severe form of PMS that affects 3–8% of women and requires appropriate medical support.

Similarly, very irregular cycles combined with marked PMS can be a sign of an underlying hormonal imbalance that deserves to be explored with a healthcare professional, such as your GP or a gynaecologist.

Remember: PMS is not ‘all in your head’. It is a physiological reality, and you deserve support to live well throughout your cycle. ��

If your symptoms feel more extreme than typical PMS, it may be worth reading: Premenstrual Dysphoric Disorder (PMDD): Far More Than Severe PMS