Ingredient evidence
Magnesium glycinate
The most recommended supplement in women's health, and one of the few where the recommendation is broadly reasonable. Here is what it does, what it does not, and how to take it without wasting money.
Also sold as: magnesium bisglycinate, chelated magnesium.
Our read of the evidence
Reasonable evidence
Some good human data, but not enough to be certain.
Genuinely useful if you are low in magnesium or sleeping badly. Not a sedative, and not a cure for anxiety.
What the evidence actually shows
Magnesium is an essential mineral involved in several hundred enzyme reactions, including nerve signalling and muscle relaxation. UK intake data consistently shows a meaningful proportion of women fall below the reference nutrient intake, particularly those eating less green veg, nuts and wholegrains. Correcting a genuine shortfall is where most of the benefit sits.
For sleep, trials in older adults show modest improvements in sleep quality and time to fall asleep. The effect sizes are small and the studies are not large. It is fair to describe magnesium as sleep-supportive; it is not fair to describe it as a sleeping pill.
For premenstrual symptoms, several small trials suggest magnesium reduces fluid retention, breast tenderness and mood symptoms, often better when combined with vitamin B6. The trials are old and small, but the risk of trying it is low.
For migraine, the evidence is stronger than most people realise: magnesium is one of the few supplements with enough data to appear in headache guidelines as a preventive option, usually at higher doses than a general wellbeing product provides.
Why the form matters more than the brand
Magnesium oxide is cheap and poorly absorbed. Most of it stays in the gut, which is why it works as a laxative and why so many people conclude magnesium 'upsets my stomach'. Glycinate, citrate and malate are all better absorbed. Glycinate is the gentlest and the one usually chosen for evening use.
Read the elemental magnesium figure, not the compound weight. A capsule listing '1,000mg magnesium bisglycinate' may contain only 100-140mg of actual magnesium. This single detail explains most of the price difference between products that look identical on the shelf.
How to take it.
- Typical dose
- 200-400mg elemental magnesium daily
- Form
- Glycinate or bisglycinate for sleep and calm; citrate if constipation is also an issue
- Timing
- Evening, with or after food
- Worth knowing
- Start at the lower end. The UK safe upper level for supplemental magnesium is 400mg a day; higher doses are used clinically but should be a decision made with a prescriber.
What it will not do.
- It will not sedate you or reliably knock you out
- It will not treat clinical anxiety or depression
- It will not replace HRT for perimenopausal sleep disruption
- It will not do anything noticeable if your magnesium status is already fine
Who should avoid it.
- You have reduced kidney function - magnesium is cleared by the kidneys and can accumulate
- You have a heart block or are on medication for a slow heart rate
- You are already taking a prescribed magnesium preparation
Raise with a prescriber
- Reduces absorption of some antibiotics (tetracyclines, quinolones) - separate by at least two hours
- Reduces absorption of levothyroxine - separate by four hours
- May add to the effect of bisphosphonates and some blood pressure medicines
Products containing magnesium glycinate.
Everything below is stocked in the UK. Compare on the active dose and the cost per day rather than the size of the pack.
| Product | Key actives | Form | Price | Per day | Best for |
|---|---|---|---|---|---|
| Cycle Support PackPerelel | Vitamin B6, Magnesium glycinate, Calcium, Chasteberry | Capsule | £42/month | £1.50 | PMS and mild PMDD, Regular menstrual cycles, Wanting cycle-aware support |
| Magnesium EaseThe Nue Co. | Magnesium chloride (topical) | Spray | £35 | £1.17 | Restless legs, Sleep-onset insomnia, Post-workout recovery |
| Magnesium Glycinate 400BetterYou | Magnesium bisglycinate 400mg | Capsule | £18 | 60p | Sleep-onset insomnia, Muscle cramps, Perimenopausal sleep changes |
| Peri-BoostMPowder | Sage, Maca, B-complex, Magnesium, Vitamin D3 | Powder | £55/month | £1.83 | Perimenopause, Hot flushes, Perimenopausal fatigue |
| Liposomal Magnesium BisglycinateElle Sera | Magnesium bisglycinate (liposomal) | Liquid | £40.00 | £1.33 | Trouble falling asleep or staying asleep, Muscle cramps, restless legs or night-time tension, Cycle-related tension and irritability, Anyone who has found other magnesium forms upsetting to the gut |
| Cycle ElixirARTAH | Myo-inositol, Vitamin B6 (P5P), Magnesium, Chasteberry | Powder | £48 | £1.60 | PCOS, PMDD, Irregular cycles |
| Wild Nutrition Food-Grown MagnesiumWild Nutrition | Magnesium (food-grown) | Capsule | £24.00 | 80p | Broken sleep, Night-time cramps |
| Menopace OriginalVitabiotics | B vitamins, Vitamin D, Zinc | Tablet | ~£10 | - | Filling nutrient gaps in perimenopause, Women who want a non-botanical option |
| Perimenopause Multi-NutrientHealth & Her | Sage, Red clover, Vitamin B6 | Capsule | ~£24 | - | Early perimenopause alongside lifestyle change, Women not yet on HRT |
| Wild Nutrition Endo SupportWild Nutrition | Magnesium, B vitamins, Botanical blend | Capsule | £46.50 | £1.55 | Nutritional support alongside specialist care |
| Wild Nutrition Premenstrual SupportWild Nutrition | Magnesium, Vitamin B6, Botanical blend | Capsule | £41.00 | £1.37 | Broken sleep, Night-time cramps, Premenstrual symptoms, as a time-limited trial |
| Wild Nutrition Menopause ComplexWild Nutrition | Magnesium, Vitamin D, B vitamins, Botanicals | Capsule | £42.00 | £1.40 | Broken sleep, Night-time cramps, UK winter |
| DR.VEGAN Magnesium GlycinateDR.VEGAN | Magnesium bisglycinate | Capsule | £19.99 | 67p | Broken sleep, Night-time cramps |
| DR.VEGAN PMS HeroDR.VEGAN | Chasteberry, Vitamin B6, Magnesium, Ashwagandha | Capsule | £26.99 | 90p | Premenstrual symptoms, as a time-limited trial, Broken sleep, Night-time cramps |
| Bare Biology Ready & Rested Magnesium BisglycinateBare Biology | Magnesium bisglycinate 375mg | Capsule | £34.99 | 58p | Broken sleep, Night-time cramps |
| ARTAH Essential MagnesiumARTAH | Magnesium blend | Capsule | £24.00 | - | Broken sleep, Night-time cramps |
| Together Health Marine MagnesiumTogether Health | Marine-sourced magnesium | Capsule | £8.95 | 30p | Broken sleep, Night-time cramps |
| Viridian High Potency Magnesium BisglycinateViridian Nutrition | Magnesium bisglycinate | Capsule | £16.05 | 54p | Broken sleep, Night-time cramps |
| Igennus Triple Magnesium ComplexIgennus Healthcare Nutrition | Magnesium citrate, bisglycinate, taurate | Tablet | £16.95 | 56p | Broken sleep, Night-time cramps |
Prices are the brand's UK list price at the time of writing and change often. Cost per day is calculated from pack size and the label's daily serving, and is shown only where both are published.
Common questions.
Is magnesium glycinate better than magnesium citrate?
For sleep and calm, yes: glycinate is gentler on the gut and the glycine itself is mildly calming. Citrate is the better choice if you also want help with constipation, because it draws water into the bowel.
How long before magnesium works for sleep?
People who respond usually notice a difference within one to two weeks. If nothing has changed after a month at 300-400mg, magnesium is not your limiting factor and continuing is unlikely to help.
Can I take magnesium during perimenopause?
Yes, and it is a sensible thing to try for sleep, cramps and restless legs. It does not replace hormone therapy, and it will not touch hot flushes.
Can you take too much magnesium?
Yes. Excess supplemental magnesium causes diarrhoea first, and in people with impaired kidney function it can build up to dangerous levels. Stay at or below 400mg supplemental daily unless a clinician advises otherwise.
Where this comes from.
A supplement is not clinical care.
If symptoms are affecting your work, your sleep or your relationships, the useful next step is an assessment rather than another purchase. Our check-in takes three minutes and points you to the right kind of clinician.
Related on Clarity Clinic
Other ingredients
Mixed evidence. A reasonable, cheap thing to try for PMS at 50-100mg. Never go above the labelled limit.
Mixed evidence. The stress data is better than most adaptogens, but the cautions are real. Not a supplement to take casually.
Good evidence. Vitamin D is a genuine UK public health recommendation. K2 is reasonable, optional and oversold.
More across the site
Clinician-designed ASRS-based screening, nothing stored.
Why your dose stops holding before your period, and what to track.
adhd assessment jobs uk
ADHD in women more often presents as inattention, executive dysfunction, emotional intensity and rejection sensitivity t
Route in, regulator, timeline and cost.
Indicative NHS and private pay ranges, side by side.
West Midlands
South West
Food supplements are not medicines and are not intended to diagnose, treat or cure any condition. They should not replace a varied diet or prescribed treatment. If you are pregnant, breastfeeding, taking medication or managing a diagnosed condition, check with a pharmacist or clinician before starting anything on this page. We do not accept payment for inclusion or placement. Where a link earns us a commission we say so on the product page. Last reviewed 27 August 2026.