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Magnesium Complex (4 in 1) Capsules

£13.49 for 90 servings at WeightWorld. That works out at 4p per 100 mg magnesium, which ranks it 17th of the 79 magnesium blends and other forms we price across 15 UK retailers.

What it really costs, per 100 mg magnesium4pOne 100 mg dose is our comparison unit for magnesium. It is not a recommendation.
A day4p
A week26p
A month£1.12
A year£13.68

At one 100 mg dose a day, this pack lasts 12 months. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Magnesium

  • In the pack: 90 × 400 mg = 36 g
  • £13.49 ÷ 36 g × 100 mg = 3.75p per 100 mg magnesium
  • A week 3.75p × 7 = 26p · a month × 30 = £1.12 · a year × 365 = £13.68
  • Amount per serving: stated on the label.

L-Leucine

  • In the pack: 90 × 90 mg = 8.1 g
  • £13.49 ÷ 8.1 g × 3 g = £5.00 per 3 g
  • A week £5.00 × 7 = £34.97 · a month × 30 = £149.89 · a year × 365 = £1823.65
  • Amount per serving: stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

Cheaper magnesium blends and other forms

All 79, ranked →
Calcium & Magnesium TabletsMyprotein · 375 mg a serving · 98p a month · a pack lasts 11 months3p£10.99View at Myprotein (opens in a new tab)
ZipVitMagnesium Citrate 1400mgZipVit · 400 mg a serving · £1.00 a month · a pack lasts 2 years3p£23.99View at ZipVit (opens in a new tab)
WeightWorldMagnesium Complex Capsules PouchWeightWorld · 400 mg a serving · £1.12 a month · a pack lasts 8 months4p£8.99View at WeightWorld (opens in a new tab)
ZipVitMagnesium Citrate 1400mgZipVit · 400 mg a serving · £1.12 a month · a pack lasts 8 months4p£8.99View at ZipVit (opens in a new tab)
ZipVitCalcium 400mg with Magnesium 200mgZipVit · 200 mg a serving · £1.12 a month · a pack lasts 8 months4p£8.99View at ZipVit (opens in a new tab)
WeightWorldThis productWeightWorld · 400 mg a serving · £1.12 a month · a pack lasts 12 months4pshown above

Switching to the Myprotein pack saves 15p a month at the same 100 mg dose.

Ranked purely by price per 100 mg magnesium. 236 combination products also contain magnesium.

On the label

Magnesium · Blends and other forms
400 mg per serving (stated on the label)
L-Leucine · L-Leucine
90 mg per serving (stated on the label)
Pack
90 servings · 2 capsule(s) a serving
Cost per serving
15p (90 servings in the pack)
More label details
Sold by
WeightWorld
What the listing says
“Servings per Container: 90” · “Serving Size: 2 Capsules” · “L-Leucine ; 90 mg”
Ingredients

: Microcrystalline Cellulose, Vege Capsule Shell: Hypromellose (HPMC) Advice Do not exceed the recommended daily dose. Food supplements must not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Discontinue use if any adverse reactions occur. Not intended for use by persons under the age of 18.

From the WeightWorld listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

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One 100 mg dose is our comparison unit, not a recommendation.

Price history

No price change since 9 October 2026. Checked on 1 day, most recently 9 October 2026.

Price at every check
£13.49WeightWorld
First recorded
£13.499 Oct
Checked on
1 daysince 9 Oct

Checked once so far, on 9 October 2026.

  1. First checked at WeightWorld: £13.49

Questions about this product

How much does WeightWorld Magnesium Complex (4 in 1) Capsules cost per 3 g?

£5.00 per 3 g, from £13.49 for 90 servings at WeightWorld, checked on 9 October 2026.

How long does one pack last?

3 days at one 3 g dose. The pack holds 8.1 g in total.

How much does WeightWorld Magnesium Complex (4 in 1) Capsules cost per 100 mg magnesium?

4p per 100 mg magnesium, from £13.49 for 90 servings at WeightWorld, checked on 9 October 2026.

Is it the cheapest of the magnesium blends and other forms in the UK?

No, it is 17th of 79. Magnesium 500mg at ZipVit works out at 1p per 100 mg magnesium.

How long does one pack last?

12 months at one 100 mg dose. The pack holds 36 g in total.

About WeightWorld

All 124 WeightWorld products, priced per dose

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All magnesiumEvery form, cheapest per 100 mg magnesium firstMagnesium blends and other forms79 products ranked, from 1pMagnesium guideWhat it is, why people take it, how the forms differWeightWorldAll 124 products from this brand, per doseMineralsEverything else we price in this categoryMagnesium price historyEvery magnesium product's price per dose and price historyBuild a basketThe cheapest way to buy several at onceHow we compareWhere every number on this page comes from