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Protein WorksMinerals

Zinc & Magnesium 90, 90 capsules

£9.99 for 90 capsules at Protein Works. It carries more than one active ingredient, so it is not ranked against single-ingredient products. Each price below counts one ingredient only.

What it really costs, per 15 mg zinc17pOne 15 mg dose is our comparison unit for zinc. It is not a recommendation.
A day17p
A week£1.17
A month£5.00
A year£60.77

At one 15 mg dose a day, this pack lasts 2 months. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Zinc

  • Servings: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 10 mg = 900 mg
  • £9.99 ÷ 900 mg × 15 mg = 16.7p per 15 mg zinc
  • A week 16.7p × 7 = £1.17 · a month × 30 = £5.00 · a year × 365 = £60.77
  • Amount per serving: stated on the label.

Magnesium

  • Servings: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 150 mg = 13.5 g
  • £9.99 ÷ 13.5 g × 100 mg = 7.4p per 100 mg magnesium
  • A week 7.4p × 7 = 52p · a month × 30 = £2.22 · a year × 365 = £27.01
  • 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.

How it compares: zinc sulphate

All 13, ranked →
Ultra ZincCheapest per 15 mg zincVitabiotics · 15 mg a serving · £1.92 a month · a pack lasts 2 months6p£3.85View at Vitabiotics (opens in a new tab)
Ionic Zinc Liquid DropsHealf · 11.3 mg a serving · £8.95 a month · a pack lasts 30 days30p£8.99View at Healf (opens in a new tab)
Zinc Liquid DropsHealf · 15 mg a serving · £15.53 a month · a pack lasts 28 days52p£14.49View at Healf (opens in a new tab)
This productProtein Works · 10 mg a serving · £5.00 a month · a pack lasts 2 months17pshown above

Ranked purely by price per 15 mg zinc. 48 combination products also contain zinc.

How it compares: magnesium oxide

All 9, ranked →
Magnesium 375mg 180 Tablets (3 month supply)Cheapest per 100 mg magnesiumBoots · 375 mg a serving · £1.14 a month · a pack lasts 11 months4p£12.85View at Boots (opens in a new tab)
Magnesium 375mg 60 Tablets (1 Month Supply)Boots · 375 mg a serving · £1.41 a month · a pack lasts 4 months5p£5.30View at Boots (opens in a new tab)
Magnesium Tablets 200mgSimply Supplements · 100 mg a serving · £1.61 a month · a pack lasts 12 months5p£19.29View at Simply Supplements (opens in a new tab)
This productProtein Works · 150 mg a serving · £2.22 a month · a pack lasts 4 months7pshown above

Ranked purely by price per 100 mg magnesium. 91 combination products also contain magnesium.

On the label

Zinc · Sulphate
10 mg per serving (stated on the label)
Magnesium · Oxide
150 mg per serving (stated on the label)
Pack
90 capsules · 90 servings · 1 capsule(s) a serving
Cost per serving
11p (90 servings in the pack)
More label details
Barcode
5060385442289
Sold by
Protein Works
What the listing says
“90” · “per capsule” · “[Magnesium ; 150mg ; 40%]”
Ingredients

Magnesium Oxide, Microcrystalline Cellulose, Capsule Shell (Hydroxypropyl Methyl Cellulose), L-Methionine, Zinc Sulphate, Vitamin B6 (Pyridoxine Hydrochloride), Magnesium Stearate, Copper Gluconate.

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

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One 15 mg dose is our comparison unit, not a recommendation.

Price history

No price change since 23 September 2026. Checked on 2 days, most recently 9 October 2026.

Price at every check
£9.99Protein Works
First recorded
£9.9923 Sept
Checked on
2 dayssince 23 Sept
Pack price at each check.
  1. First checked at Protein Works: £9.99

Questions about this product

How much does Protein Works Zinc & Magnesium 90 cost per 100 mg magnesium?

7p per 100 mg magnesium, from £9.99 for 90 capsules at Protein Works, checked on 9 October 2026.

How long does one pack last?

4 months at one 100 mg dose. The pack holds 13.5 g in total.

How much does Protein Works Zinc & Magnesium 90 cost per 15 mg zinc?

17p per 15 mg zinc, from £9.99 for 90 capsules at Protein Works, checked on 9 October 2026.

How long does one pack last?

2 months at one 15 mg dose. The pack holds 900 mg in total.

About Protein Works

Founded 2012 · Liverpool, England · Part of Lactalis

Protein Works is a British nutrition company founded in 2012 by Mark Coxhead, Nick Smith and Karl Jacobie. It is based at PW Campus in Speke, Liverpool, which opened in 2025 and replaced several sites in Runcorn.

All 149 Protein Works products, priced per doseVisit Protein Works (opens in a new tab)

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