Last updated: June 2026
Ever noticed puffiness or swelling in your hands, legs, ankles or feet? For many people — particularly women — water retention is an uncomfortable fact of life. But it doesn't have to be.
This guide covers everything you need to know about using magnesium for water retention: how it may help, the best forms to choose, dosage, and what the research says.
Evopure magnesium supplements
Is magnesium good for water retention?
Water retention (Edema) occurs when fluid builds up in body tissue — most commonly in hands, legs, ankles, face and feet. It can be triggered by standing or sitting too long, hormonal changes, PMS or pregnancy.
Yes — magnesium is thought to help reduce water retention by relaxing blood vessels, improving circulation to reduce fluid build-up, and supporting kidney function to maintain proper electrolyte balance. One 2013 study found magnesium reduced water retention and bloating in participants.
There are also studies into magnesium's potential to ease water retention as a PMS symptom, though more research is needed.
Read more: Magnesium for bloating | Magnesium in pregnancy
Does magnesium cause water retention?
Research suggests the potential for magnesium to cause water retention is minimal. Magnesium is far more likely to alleviate edema than cause it.
Not sure which magnesium is right for you?
Answer 5 quick questions and we’ll recommend the best Evopure formula for your goals — sleep, stress, bloating or all three.
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There’s no consensus on the single best form, but choosing one with high bioavailability ensures maximum absorption. Top options include:
Magnesium citrate
Excellent absorption and helps attract water into the gut. One of the most well-researched, multifunctional forms. A solid first choice for water retention.
Magnesium glycinate
Highly bioavailable, gentle on the stomach. Also supports sleep, anxiety and PMS symptoms — including bloating. A great all-rounder. Our Magnesium Sleep Blend uses a glycinate complex.
Magnesium malate
Commonly used for muscle pain and fatigue. Considered to have energising properties.
Magnesium chloride
Good bioavailability. Also available as a topical oil or spray.
Read more: 12 types of magnesium supplements | Magnesium glycinate vs other forms
How much magnesium should I take for water retention?
There’s no specific dose for water retention, but most studies use 200–400 mg of magnesium per day. NHS guidance suggests supplementation up to 400 mg daily is unlikely to cause harm for most adults. Always follow your product’s label and speak to a healthcare professional before starting.
Read more: Best time to take magnesium | How long does magnesium take to work?
How to choose a quality magnesium supplement
- Choose brands that provide third-party lab reports for every batch
- Look for organic, non-GMO, vegan-certified options where possible
- Check elemental magnesium content (not just compound weight) on the label
- Powder forms tend to absorb faster than tablets
Frequently asked questions
Does magnesium reduce water weight?
Yes, magnesium can help reduce water weight by counteracting water retention and supporting healthy fluid balance.
Does magnesium make you retain water?
No — magnesium does the opposite. It supports fluid excretion rather than retention.
How much magnesium should I take for water retention?
Most studies use 200–400 mg per day. NHS guidance suggests up to 400 mg daily is safe for most adults. Always follow product labels and check with a healthcare professional.
Which form of magnesium is best for water retention?
High-bioavailability forms like citrate, glycinate, malate and chloride are common choices. Magnesium citrate is often recommended for fluid balance; glycinate is a gentler all-rounder that also supports sleep and PMS.
Can magnesium help with PMS bloating?
Yes — some research suggests magnesium may help reduce PMS symptoms including bloating and water retention, particularly at doses around 250 mg/day. More research is ongoing.
Final thoughts on magnesium for water retention
Preliminary evidence suggests magnesium can be effective in reducing water retention, particularly when linked to PMS or poor fluid balance. The best forms for this purpose include citrate and glycinate, taken consistently within NHS-recommended limits.
Always speak with a healthcare professional before adding any new supplement, particularly if you take other medications or have an underlying health condition.
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