Magnesium Bisglycinate 665mg, Food Supplement, 30 Capsules
£7.50 for 30 capsules at Boots. That works out at 4p per 100 mg bisglycinate (glycinate), which ranks it 64th of the 66 magnesium bisglycinate products we price across 13 UK retailers.
At one 100 mg dose a day, this pack lasts 7 months. A month is 30 days, so twelve of them is not quite a year.
How we worked it out
- Servings: 30 ÷ 1 per serving = 30
- In the pack: 30 × 665 mg = 20 g
- £7.50 ÷ 20 g × 100 mg = 3.76p per 100 mg bisglycinate (glycinate)
- A week 3.76p × 7 = 26p · a month × 30 = £1.13 · a year × 365 = £13.72
- Amount per serving: estimated from the compound weight using our conversion factor.
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 →
Ranked purely by price per 100 mg magnesium. Labels here do not all state the same thing: this one gives estimated from the compound weight using our conversion factor, the cheapest gives stated on the label. Check both before choosing. 86 combination products also contain magnesium.
On the label
- Magnesium · Bisglycinate (glycinate)
- 665 mg per serving (estimated from the compound weight using our conversion factor)
- Pack
- 30 capsules · 30 servings · 1 capsule(s) a serving
- Cost per serving
- 25p (30 servings in the pack)
More label details
- Sold by
- Boots
- What the listing says
- “30 Capsules” · “Take 1 capsule a day” · “Magnesium Bisglycinate 665mg” · “Magnesium Bisglycinate 665mg”
Ingredients
Magnesium Bisglycinate, Capsule Shell (Hydroxypropyl Methyl Cellulose), Bulking Agent (Microcrystalline Cellulose), Anti-Caking Agents (Silicon Dioxide, Magnesium Stearate).
From the Boots 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.
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Filled in from the label’s serving: 1 capsule.
What you paid
Optional. At Boots today: £7.50.
“Order by” allows 3 working days’ delivery from Boots and your spare days.
Price history
No price change since 23 September 2026. Checked on 2 days, most recently 15 October 2026.
- Price at every check
- £7.50Boots
- First recorded
- £7.5023 Sept
- Checked on
- 2 dayssince 23 Sept
- First checked at Boots: £7.50
Questions about this product
How much does Boots Magnesium Bisglycinate 665mg, Food Supplement, 30 Capsules cost per 100 mg bisglycinate (glycinate)?
4p per 100 mg bisglycinate (glycinate), from £7.50 for 30 capsules at Boots, checked on 15 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 bisglycinate (glycinate).
How long does one pack last?
7 months at one 100 mg dose. The pack holds 20 g in total.
About Boots
Founded 1849 · Nottingham, England · Part of The Boots Group
Boots is a pharmacy-led health and beauty retailer founded in 1849, when John Boot opened a herbalist shop in Nottingham, where it is still based. com. It belongs to The Boots Group, owned since August 2025 by the private equity firm Sycamore Partners and Stefano Pessina's family.
All 96 Boots products, priced per doseVisit Boots (opens in a new tab)
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