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Minerals

Magnesium Glycinate 375mg 90 Capsules

£19.29 for 90 capsules at Holland & Barrett. That works out at 25p per 100 mg magnesium, which ranks it 64th of the 66 magnesium bisglycinate products we price across 13 UK retailers.

What it really costs, per 100 mg magnesium25pOne 100 mg dose is our comparison unit for magnesium. It is not a recommendation.

A day25p

A week£1.77

A month£7.56

A year£92.04

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 ÷ 1 per serving = 90
In the pack: 90 × 85 mg = 7.65 g
£19.29 ÷ 7.65 g × 100 mg = 25.2p per 100 mg magnesium
A week 25.2p × 7 = £1.77 · a month × 30 = £7.56 · a year × 365 = £92.04
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 bisglycinate

All 66, ranked →

Magnesium Bisglycinate 665mg, Food Supplement, 30 CapsulesBoots · 665 mg a serving · £1.13 a month · a pack lasts 7 months4p£7.50View at Boots

Magnesium Bisglycinate 200mgHealf · 200 mg a serving · £3.50 a month · a pack lasts 4 months12p£13.99View at Healf

Magnesium (glycinate)Healf · 120 mg a serving · £4.10 a month · a pack lasts 1.2 years14p£59.07View at Healf

Magnesium (glycinate)Healf · 120 mg a serving · £4.84 a month · a pack lasts 7 months16p£34.84View at Healf

Magnesium (glycinate)Healf · 120 mg a serving · £5.19 a month · a pack lasts 4 months17p£18.69View at Healf

This productHolland & Barrett · 85 mg a serving · £7.56 a month · a pack lasts 3 months25pshown above

Cheapest anywhere: 1p per 100 mg magnesium at Simply Supplements.

Ranked purely by price per 100 mg magnesium. Labels here do not all state the same thing: this one gives stated on the label, the cheapest gives estimated from the compound weight using our conversion factor. Check both before choosing. 86 combination products also contain magnesium.

On the label

Magnesium · Bisglycinate (glycinate): 85 mg per serving (stated on the label)
Pack: 90 capsules · 90 servings · 1 capsule(s) a serving
Cost per serving: 21p (90 servings in the pack)

More label details

Sold by: Holland & Barrett
What the listing says: “90 Capsules” · “Take 1 capsule per day” · “Elemental Magnesium ; 85mg” · “Magnesium Bisglycinate ; 375mg”

Ingredients

Magnesium Bisglycinate, Capsule Shell (Hydroxypropyl Methyl Cellulose), Bulking Agent (Microcrystalline Cellulose), Magnesium Oxide, Anti-Caking Agents (Magnesium Salts of Fatty Acids, Silicon Dioxide).

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

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Daily dosemgFordays

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

Price history

1 price change since 17 September 2026. Checked on 3 days, most recently 22 October 2026.

Lowest recorded: £9.6417 Sept
Highest recorded: £19.299 Oct
First recorded: £9.6417 Sept
Checked on: 3 dayssince 17 Sept

Pack price at each check; dashed while out of stock.

22 OctOut of stock at Holland & Barrett
9 Oct Up at Holland & Barrett: £9.64 → £19.29 (+100%)
17 SeptFirst checked at Holland & Barrett: £9.64

Questions about this product

How much does Holland & Barrett Magnesium Glycinate 375mg 90 Capsules cost per 100 mg magnesium?

25p per 100 mg magnesium, from £19.29 for 90 capsules at Holland & Barrett, checked on 22 October 2026.

Is it the cheapest magnesium bisglycinate in the UK?

No, it is 64th of 66. Magnesium Bisglycinate 1500mg at Simply Supplements works out at 1p per 100 mg magnesium.

How long does one pack last?

3 months at one 100 mg dose. The pack holds 7.65 g in total.

About Holland & Barrett

Founded 1870 · Nuneaton, England · Part of L1 Retail (LetterOne)

Holland & Barrett is a health and wellness retailer founded in 1870, when Alfred Slapps Barrett and Major William Holland opened a grocery shop in Bishop's Stortford. It is based in Nuneaton, Warwickshire, and has been owned by LetterOne's L1 Retail since 2017.

All 32 Holland & Barrett products, priced per dose Visit Holland & Barrett (opens in a new tab)

Keep comparing

All magnesiumEvery form, cheapest per 100 mg magnesium first Magnesium Bisglycinate (glycinate)66 products ranked, from 1p Magnesium guideWhat it is, why people take it, how the forms differ Holland & BarrettAll 32 products from this brand, per dose MineralsEverything else we price in this category Magnesium price historyEvery magnesium product's price per dose and price history Build a basketThe cheapest way to buy several at once How we compareWhere every number on this page comes from