Best Magnesium Supplement UK: 5 Top Picks for 2026

If you want the best magnesium supplement UK shops stock right now, the short answer is that a clean magnesium glycinate (also labelled magnesium bisglycinate) from a reputable brand is the sensible default for most people, with a multi-form complex or a topical spray making sense in specific cases. Magnesium is a food supplement, not a magic pill, but plenty of UK adults fall a little short of the recommended intake from diet alone, and the right form, dose and price matter more than the marketing on the tub. Below are our five picks, chosen on form, elemental dose, third-party reassurance and value.

Magnesium is involved in hundreds of processes in the body, from muscle and nerve function to normal energy release and a reduction in tiredness. Most people get enough from a varied diet of leafy greens, nuts, seeds, wholegrains and legumes, but if you eat few of those, train hard or simply want to support evening wind-down, a supplement can help fill the gap. The key thing to understand is form. Glycinate and citrate absorb well, glycinate is the gentlest and most calming, citrate can loosen the bowels, and cheap oxide is poorly absorbed despite a big number on the label. Watch the elemental magnesium figure rather than the compound weight, because a "1500mg" product might only deliver 200mg to 300mg of actual magnesium.

1. Nutravita Magnesium Glycinate 1000mg: Best Overall

Our top pick is Nutravita Magnesium Glycinate 1000mg, because it does the fundamentals right at a fair price. Each serving of two capsules provides 1000mg of magnesium bisglycinate, delivering 200mg of elemental magnesium, the form most people want for everyday use and evening relaxation thanks to its gentle, well-absorbed profile. Nutravita is a well-known UK brand that manufactures and batch-tests in the UK, the capsules are vegan, and the 120-capsule tub is a 60-day supply that usually lands at a reasonable price per serving.

The honest downside is that you take two capsules to hit the full 200mg, so if you prefer a one-a-day tablet this is not it, and 200mg is a sensible rather than a maximal dose. For the great majority of buyers wanting a clean glycinate that does not upset the stomach, it is the easy recommendation.

Check price on Amazon

2. Nutravita Magnesium 5-in-1 Complex 1146mg: Best Complex

If you would rather cover several bases at once, the Nutravita Magnesium 5-in-1 Complex is our pick, and it was named a Which? Best Buy in 2025. It blends five forms (bisglycinate, citrate, malate, oxide and ascorbate) to deliver 400mg of elemental magnesium per serving, which is a generous everyday dose. The 240-capsule tub also makes the price per serving very competitive, so it is strong value for regular users.

The catch with any complex is that part of the magnesium comes from oxide, which is poorly absorbed, so the headline elemental figure flatters the truly bioavailable amount a little. That said, the inclusion of bisglycinate, citrate and malate means there is plenty of well-absorbed magnesium here, and the Which? endorsement is genuine reassurance. A good choice if you want an all-rounder rather than a single form.

Check price on Amazon

3. VitaBright Magnesium Glycinate 1500mg: Best High Strength

For anyone who wants a higher daily dose from glycinate specifically, the VitaBright Magnesium Glycinate 1500mg is a solid option. The full serving provides 1500mg of magnesium bisglycinate, giving 300mg of elemental magnesium, which is close to a full adult day's worth in a single product. It is vegan, made in the UK to GMP standards in a BRC-accredited facility, and the 180-capsule tub gives a long run between reorders.

The downside is the same as most glycinate products: to reach the full 300mg you take several capsules a day, so capsule count adds up and the tub empties faster than the 180 figure suggests. If you know you want a stronger glycinate dose and do not mind taking a few capsules, it is well made and keenly priced.

Check price on Amazon

4. Nutravita Magnesium Glycinate Complex with Vitamin C & B6: Best for Sleep

If your main reason for supplementing is evening wind-down, the Nutravita Magnesium Glycinate Complex with Vitamin C and B6 is our sleep-focused pick. It pairs magnesium bisglycinate and citrate (344mg elemental magnesium per serving) with vitamin B6, which contributes to normal psychological function and the regulation of hormonal activity, and vitamin C. Magnesium and B6 are a sensible combination for people focused on relaxation and recovery at the end of the day.

To be clear, the evidence that magnesium reliably improves sleep is mixed and strongest in people who are actually low in magnesium, so treat this as support for normal relaxation rather than a sleeping aid. Take it 30 to 60 minutes before bed for the best chance of feeling the calming effect. As a glycinate-led complex with added B6, it is a thoughtful formula for the job.

Check price on Amazon

5. BetterYou Magnesium Sleep Body Spray: Best Spray

Not everyone gets on with capsules, and that is where the BetterYou Magnesium Sleep Body Spray comes in. It is a topical magnesium chloride spray with added lavender and chamomile, designed to be spritzed onto the skin (legs, feet or arms) before bed as part of a wind-down routine. BetterYou is a respected British magnesium brand, the bottle gives hundreds of sprays, and the lavender scent is genuinely relaxing for many users, which is half the appeal.

Be realistic about the science here, though. The evidence that magnesium absorbs meaningfully through the skin is weak, so a spray should not be your only source if you are trying to top up your intake, and it can tingle or sting on freshly shaved or broken skin. As a pleasant, capsule-free addition to a bedtime routine it has a loyal following, but a glycinate capsule is the better bet if absorption is your priority.

Check price on Amazon

Which magnesium supplement should you buy?

We compared the most popular magnesium supplements on Amazon UK, and these five cover the main needs. Here is the quick summary:

• Best overall: Nutravita Magnesium Glycinate 1000mg is a clean, gentle bisglycinate at a fair price, and the right default for most people.
• Best complex: the Nutravita 5-in-1 Complex is a Which? Best Buy that packs five forms and 400mg elemental magnesium into great-value tubs.
• Best high strength: VitaBright Magnesium Glycinate 1500mg suits anyone wanting a larger 300mg glycinate dose, as long as you do not mind a few capsules.
• Best for sleep: the Nutravita Glycinate Complex with B6 pairs glycinate with vitamin B6 for an evening relaxation focus.
• Best spray: the BetterYou Magnesium Sleep Body Spray is the capsule-free, lavender-scented choice for a bedtime routine, with the caveat that skin absorption is unproven.

Whatever you pick, remember a supplement is there to top up a balanced diet, not replace it, and the elemental magnesium figure is the number that matters. If you are pregnant, on prescription medication or have kidney problems, have a quick word with your GP or pharmacist first.

Recommended reads

• Best Creatine UK: Top Monohydrate Picks
• Best Pre-Workout UK
• More nutrition reviews and guides