Best magnesium supplements UK 2026, tried and tested by health experts

Magnesium is a key mineral in the body that plays an important role in a host of different functions, from regulating muscle contractions and blood pressure to helping with energy production and blood sugar balance. It even supports healthy sleep and mood.

In foods, magnesium is found in nuts, seeds and leafy green veg. Most people will be able to increase their intake through diet, however you could also consider choosing to take a supplement to help support your levels.

In our search for the best magnesium supplements, we consulted nutritionist Kerry Torres and tried a range of capsules, bath salts, body oils and drinks, including Prowise Advanced 4 in 1 Magnesium Complex and Inessa Calcium and Magnesium; both among our top picks for 2026. We tested them for potency and taste as well as evaluating the nutrient profile, number of additives and whether they're suitable for vegans, coeliacs and other dietary requirements.

If you're looking for more information, read our guide to the best magnesium supplements for sleep. Our friends at Good Food have a guide to the health benefits of magnesium, plus a guide to the vital vitamins you need.

Jump to:

• Best magnesium supplements at a glance
• Best UK magnesium supplement
• What form of magnesium should I choose?
• How much magnesium do I need?
• Best magnesium for sleep

Best magnesium supplements at a glance

• Best calcium and magnesium blend: Inessa Calcium and Magnesium, £24.99
• Best advanced formula: Prowise Advanced 4 in 1 Magnesium Complex, £9.99
• Best all-round magnesium supplement: Nutrition Geeks Magnesium Glycinate 3-in-1, £9.99
• Best multi-form magnesium: Swallow Pro Magnesium 4 Complex for Sleep and Energy, £30
• Best magnesium for bone health: Vitabright Magnesium Citrate, £19.99
• Best magnesium for sleep: Heights Magnesium+, £20
• Best premium magnesium powder: Thorne Magnesium Bisglycinate Powder, £40.90
• Best magnesium with added vitamins: New Nordic Magic Magnesium Glycinate Tablets, £49.99
• Best magnesium for digestion: Holland & Barrett magnesium, £9.45

Best magnesium supplements to buy in the UK 2026

Inessa Calcium and Magnesium

• Available from Inessa (£24.99)

Best calcium and magnesium blend

Star rating: 5/5

Each capsule provides 165mg calcium and 82.5mg magnesium, giving a 2:1 ratio that supports bones, muscles and nerve function. The formula is clean, uses marine-sourced minerals and is easy to fit into a routine with flexible dosing.

If you are looking for more magnesium, the brand also offers a standalone magnesium version delivering 306mg per day (two capsules), using three forms.

Available from:
Inessa (£24.99)

Prowise Advanced 4 in 1 Magnesium Complex

• Available from Prowise (£9.99), Amazon (£9.89), Superdrug (£9.99)

Best advanced formula

Star rating: 5/5

This advanced magnesium complex supplement combines magnesium glycinate (commonly recommended for sleep), magnesium citrate (to support bone health and help reduce anxiety) and magnesium malate (to ease muscle tension). Together these forms aim to deliver a broad range of benefits for overall wellbeing. The formula provides your full daily requirement of magnesium and offers excellent value.

Available from:
Prowise (£9.99)
Amazon (£9.89)
Superdrug (£9.99)

Nutrition Geeks Magnesium Glycinate 3-in-1

• Available from Amazon (£9.99), Nutrition Geeks (£9.99)

Best all-round magnesium supplement

Star rating: 5/5

Primarily magnesium glycinate (advised for sleep), these capsules also contain the compounds magnesium citrate (for bone health to reduce anxiety) and magnesium malate (to reduce muscle tension) – hopefully bringing you the range of benefits! All in all, they provide your complete daily requirement of magnesium at just 16p a day.

Available from:
Nutrition Geeks (£9.99)
Amazon (£9.99)

Swallow Pro Magnesium 4 Complex for Sleep and Energy

• Available from The Swallow Co (£30)

Best multi-form magnesium

Star rating: 4.5/5

A more complete magnesium than most. Each serving gives 300mg elemental magnesium from four forms, so it covers more bases than single-form options.

It also includes zinc, B6 and vitamin D3, making it more of an all-in-one blend. A strong option if you want a higher dose and broader support, though the extras may not suit everyone.

Available from:
The Swallow Co (£30)

Vitabright Magnesium Citrate

• Available from Vitabright (£16.99), Amazon (£15.87)

Best magnesium supplement for bone health

Star rating: 4.5/5

This form of magnesium is designed to be well absorbed by the body and contribute to the maintenance of normal bones. Providing 118% of the daily reference intake, these capsules are free from bulking agents and common allergens.

A strong option if you’re specifically looking to support bone health, with a clean formulation that makes it a good choice as an easy-to-take everyday supplement.

Available from:
Vitabright (£16.99)
Amazon (£15.87)

Heights Magnesium+

• Available from Heights (£20)

Best magnesium for sleep

Star rating: 4.5/5

Take two of these filler-free capsules before bed to help your sleep. They contain 80 per cent of your recommended allowance of magnesium glycinate. Sign up to the easily cancellable subscription service for discounts and automated delivery to ensure you never run out.

Available from:
Heights (£20)

Thorne Magnesium Bisglycinate Powder

• Available from Healf (£40.90)

Best premium magnesium powder

Star rating: 4/5

Thorne uses magnesium bisglycinate, a form known for being easier on digestion and better absorbed than cheaper alternatives like oxide. This is more expensive than most single-ingredient options, at around £1.35 per serving, but the powder format gives you flexibility with dosing.

The powder form does mean an extra step compared to capsules. It mixes easily enough and has a mild sweetness from monk fruit, so it is not completely neutral.

Available from:
Healf (£40.90)

New Nordic Magic Magnesium Glycinate Tablets

• Available from Holland & Barrett (£49.99)

Star rating: 3.5/5

This takes more of an all-in-one approach than a straight magnesium supplement. You still get magnesium bisglycinate, a well-absorbed form, but it is paired with B vitamins, vitamin D and botanical extracts.

The magnesium dose sits at 240mg per serving, so it is moderate rather than high. There is quite a lot going on in the formula, which may appeal if you want everything in one place, but it also means you are paying a premium for ingredients beyond magnesium itself.

Available from:
Holland & Barrett (£49.99)

Holland & Barrett magnesium

• Available from Holland & Barrett (£9.45)

Best magnesium supplement for digestion

Star rating: 3.5/5

Among the lesser known attributes of magnesium are its digestive benefits. Magnesium oxide (of which these capsules contain 375mg), can help with constipation, heartburn and general digestion. These 1-a-day tablets are great value at 7p a day, but do contain some bulking agents and additives.

Available from:
Holland & Barrett (£9.45)

What form of magnesium should I choose?

Magnesium comes in a number of different forms, which can be chosen depending on individual health needs. It is usually provided in compound form in supplements, and sometimes the partner element can bring health benefits of its own.

Forms and uses include:

• For energy: Magnesium malate / orortate
• For anxiety or mood: Magnesium citrate / lactate / l-threonate / glycinate / chloride
• For digestion, including constipation: Magnesium citrate / lactate / oxide / sulfate
• For heartburn: Magnesium oxide / chloride / carbonate
• For sleep: Magnesium glycinate / chloride
• For heart health: Magnesium taurate / orotate
• For bone health: Magnesium citrate
• For muscle tension: Magnesium malate / sulfate

Supplements come in capsules and gummies, in drinks, and via the skin in bath salts, body oils and sprays. However, there’s limited quality research on how much magnesium can be absorbed via the skin so it’s impossible to gauge whether bath and oil products can help you reach your Nutrient Reference Value (NRV). Capsules and drinks are usually a more accurate way to ensure you’re getting the benefits of the added magnesium.

How much magnesium do I need?

The Nutrient Reference Value (average recommended daily amount) of magnesium is 375mg, however how much magnesium you should be looking to include will depend on individual factors including age, gender, life stage and any health or dietary issues you might have.

Make sure you’re checking the ‘elemental magnesium’ amount on the label, as a compound (for instance, magnesium oxide) won’t contain as much magnesium as the pure form.

Best magnesium for sleep

There are a number of forms of magnesium and the most useful ones for sleep are glycinate and chloride. If you're looking to relax your body before getting into bed, magnesium chloride has a calming effect on the nervous system which can help with sleep.

Stress and anxiety can be disruptive to sleep, and magnesium glycinate is useful for these conditions. It can also help with insomnia as a lack of this form of magnesium can cause you to wake up every few hours and is a main symptom of a magnesium deficiency. Read our guide to how to have a better nights sleep for more tips.

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