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Marine Magnesium + Vitamin B6 Capsules

£12.99 for 90 servings at WeightWorld. That works out at 4p per 100 mg magnesium, which ranks it 21st 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 week28p
A month£1.20
A year£14.63

At one 100 mg dose a day, this pack lasts 11 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 × 360 mg = 32.4 g
  • £12.99 ÷ 32.4 g × 100 mg = 4.01p per 100 mg magnesium
  • A week 4.01p × 7 = 28p · a month × 30 = £1.20 · a year × 365 = £14.63
  • Amount per serving: stated on the label.

Vitamin B6

  • In the pack: 90 × 2 mg = 180 mg
  • £12.99 ÷ 180 mg × 50 mg = £3.61 per 50 mg
  • A week £3.61 × 7 = £25.26 · a month × 30 = £108.25 · a year × 365 = £1317.04
  • 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 →
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)
WeightWorldMagnesium Complex (4 in 1) CapsulesWeightWorld · 400 mg a serving · £1.12 a month · a pack lasts 12 months4p£13.49View at WeightWorld (opens in a new tab)
VitaBrightMagnesium Citrate 240 x CapsulesVitaBright · 444 mg a serving · £1.13 a month · a pack lasts 1.5 years4p£19.99View at VitaBright (opens in a new tab)
VitaBrightMagnesium Citrate Capsules 1480mgVitaBright · 444 mg a serving · £1.13 a month · a pack lasts 1.5 years4p£19.99View at VitaBright (opens in a new tab)
Calcium 400mg & Magnesium 200mg TabletsSimply Supplements · 200 mg a serving · £1.17 a month · a pack lasts 12 months4p£13.99View at Simply Supplements (opens in a new tab)
WeightWorldThis productWeightWorld · 360 mg a serving · £1.20 a month · a pack lasts 11 months4pshown above

Switching to the ZipVit pack saves 8p a month at the same 100 mg dose.

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

Cheaper vitamin B6 pyridoxine HCl

Compare every product in this form →
ZipVitVitamin B6 50mgCheapest per 50 mgZipVit · 50 mg a serving · £1.00 a month · a pack lasts 12 months3p£11.99View at ZipVit (opens in a new tab)
Vitamin B6 Tablets 50mgSimply Supplements · 50 mg a serving · £1.11 a month · a pack lasts 12 months4p£13.29View at Simply Supplements (opens in a new tab)
Vitamin B6 100mgHealf · 100 mg a serving · £1.39 a month · a pack lasts 7 months5p£9.25View at Healf (opens in a new tab)
Vitamin B6 (Pyridoxine) 50mgLamberts Healthcare (Nature's Best) · 50 mg a serving · £1.65 a month · a pack lasts 3 months6p£4.95View at Lamberts Healthcare (opens in a new tab)
Designs for HealthVitamin B-6 LiquidHealf · 50 mg a serving · £29.22 a month · a pack lasts 24 days97p£22.99View at Healf (opens in a new tab)
WeightWorldThis productWeightWorld · 2 mg a serving · £108.25 a month · a pack lasts 4 days£3.61shown above

Switching to the ZipVit pack saves £107.25 a month at the same 50 mg dose.

Ranked purely by price per 50 mg. 280 combination products also contain vitamin B6.

On the label

Magnesium · Blends and other forms
360 mg per serving (stated on the label)
Vitamin B6 · Pyridoxine HCl
2 mg per serving (stated on the label)
Pack
90 servings · 2 capsule(s) a serving
Cost per serving
14p (90 servings in the pack)
More label details
Sold by
WeightWorld
What the listing says
“Servings per Container: 90” · “Serving Size: 2 Capsules” · “Magnesium ; 360 mg”
Ingredients

: Anti-Caking Agents (Magnesium Salts Of Fatty Acids, Silicon Dioxide), 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 and consult a doctor 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
£12.99WeightWorld
First recorded
£12.999 Oct
Checked on
1 daysince 9 Oct

Checked once so far, on 9 October 2026.

  1. First checked at WeightWorld: £12.99

Questions about this product

How much does WeightWorld Marine Magnesium + Vitamin B6 Capsules cost per 100 mg magnesium?

4p per 100 mg magnesium, from £12.99 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 21st of 79. Magnesium 500mg at ZipVit works out at 1p per 100 mg magnesium.

How long does one pack last?

11 months at one 100 mg dose. The pack holds 32.4 g in total.

How much does WeightWorld Marine Magnesium + Vitamin B6 Capsules cost per 50 mg?

£3.61 per 50 mg, from £12.99 for 90 servings at WeightWorld, checked on 9 October 2026.

Is it the cheapest vitamin B6 pyridoxine HCl in the UK?

No, it is 6th of 6. Vitamin B6 50mg at ZipVit works out at 3p per 50 mg.

How long does one pack last?

4 days at one 50 mg dose. The pack holds 180 mg in total.

About WeightWorld

All 124 WeightWorld products, priced per dose

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