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MineralsVegan

Essential Magnesium Tablets, 90 tablets

£5.49 for 90 tablets at Myprotein. That works out at 6p per 100 mg magnesium, which ranks it 5th of the 9 magnesium oxide products we price across 4 UK retailers.

What it really costs, per 100 mg magnesium6pOne 100 mg dose is our comparison unit for magnesium. It is not a recommendation.

A day6p

A week43p

A month£1.83

A year£22.27

At one 100 mg dose a day, this pack lasts 3 months. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Servings: 90 ÷ 3 per serving = 30
In the pack: 30 × 300 mg = 9 g
£5.49 ÷ 9 g × 100 mg = 6.1p per 100 mg magnesium
A week 6.1p × 7 = 43p · a month × 30 = £1.83 · a year × 365 = £22.27
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 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

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

Magnesium Tablets 200mgSimply Supplements · 100 mg a serving · £1.61 a month · a pack lasts 12 months5p£19.29View at Simply Supplements

Essential Magnesium TabletsMyprotein · 300 mg a serving · £1.61 a month · a pack lasts 9 months5p£14.49View at Myprotein

This productMyprotein · 300 mg a serving · £1.83 a month · a pack lasts 3 months6pshown above

Cheapest anywhere: 4p per 100 mg magnesium at Boots, 69p a month less than this one at the same 100 mg dose.

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

Sizes

Pack	Price	Per dose
90 tabletsthis one	£5.49	6p
270 tablets	£14.49	5p

Pack sizes

Pack	Price	Per dose	A year
270 tablets	£14.49	5p	£19.59
90 tabletsthis pack	£5.49	6p	£22.27

At one 100 mg dose a day, the 270 tablets pack costs £2.68 less a year than this one.

On the label

Magnesium · Oxide: 300 mg per serving (stated on the label)
Pack: 90 tablets · 30 servings · 3 tablet(s) a serving
Cost per serving: 18p (30 servings in the pack)

More label details

Claimed on the listing: vegan
Barcode: 5055936858473
Sold by: Myprotein
What the listing says: “90 Tablets” · “Consume 3 tablets daily” · “Magnesium ; 300mg ; 80”

Ingredients

Bulking Agent (Microcrystalline Cellulose), Magnesium Oxide, Anti-Caking Agent (Magnesium Stearate), Glazing Agent (Hydroxypropyl Methyl Cellulose), Colour (Calcium Carbonate), Sweetener (Xylitol), Humectant (Medium Chain Triglycerides).

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

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Your basket prices everything you take together: whole packs, delivery included, from as few websites as you like.

Daily dosemgFordays

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

Price history

3 price changes since 17 September 2026. Checked on 28 days, most recently 29 October 2026.

Lowest recorded: £4.993 Oct
Highest recorded: £5.9913 Oct
First recorded: £5.4917 Sept
Checked on: 28 dayssince 17 Sept

Pack price at each check.

27 Oct Down at Myprotein: £5.99 → £5.49 (−8.3%)
13 Oct Up at Myprotein: £4.99 → £5.99 (+20%)
3 Oct Down at Myprotein: £5.49 → £4.99 (−9.1%)

1 earlier entry

17 SeptFirst checked at Myprotein: £5.49

Questions about this product

How much does Myvitamins Essential Magnesium Tablets cost per 100 mg magnesium?

6p per 100 mg magnesium, from £5.49 for 90 tablets at Myprotein, checked on 29 October 2026.

Is it the cheapest magnesium oxide in the UK?

No, it is 5th of 9. Magnesium 375mg 180 Tablets (3 month supply) at Boots works out at 4p per 100 mg magnesium.

How long does one pack last?

3 months at one 100 mg dose. The pack holds 9 g in total.

About Myvitamins

Founded 2012 · Manchester, England · Part of THG plc

Myvitamins is a vitamins and supplements brand launched in August 2012 by The Hut Group, now THG plc, as a sister brand to Myprotein. It is run by THG Nutrition, part of Manchester-based THG.

All 118 Myvitamins products, priced per dose Visit Myvitamins (opens in a new tab)