CleanGuide · Published 2 November 2026
Magnesium glycinate: high-street labels vs lab-verified listings
A facts-only check of form, elemental magnesium dose and price per day. High-street and chemist packs are listed next to CleanAssay entries that have (or lack) an independent finished-product report. CleanAssay rankings follow published lab evidence. Affiliate status does not change rank. EUR and GBP are never converted or mixed.
Authorised claims only: magnesium contributes to normal muscle function and to the reduction of tiredness and fatigue. No other health claims are made here.
How to read the tables
- Form / dose = what the label or nutrition table states.
- Price / day = pack price ÷ servings at the label’s stated daily amount.
- “Third-party lab report published?” means a public finished-product certificate we could open. “Not found” means none located on the product page or brand lab hub at fetch time — it is not a claim about contaminants.
High-street / chemist examples
| Product (as sold) | Retailer | Form (label) | Elemental Mg / day | Pack price | Price / day | Third-party lab report published? |
|---|---|---|---|---|---|---|
| Holland & Barrett Magnesium Bisglycinate 375 mg, 90 caps | Holland & Barrett UK | Bisglycinate + magnesium oxide (bulking agents and anti-caking agents listed) | 85 mg / 1 capsule | £19.29 | £0.21 | Not found on product page |
| Same SKU, 90 caps | Holland & Barrett Ireland | Same formula | 85 mg / 1 capsule | €18.99 | €0.21 | Not found on product page |
| Boots Magnesium 375 mg, 180 tablets | Boots UK | Magnesium oxide (label summary via retailer / price mirror) | 375 mg / 2 tablets (label daily amount) | £12.85 (price check 15 Oct 2026) | £0.14 | Not found |
| Nutravita Magnesium Glycinate, 120 vegan caps | Superdrug (marketplace seller) | Bisglycinate + magnesium oxide; bulking agents listed | 200 mg / 2 capsules (page copy) | £7.99 list (page said unavailable online at fetch) | £0.13 if 60 servings | Not found on Superdrug page |
Label note (Holland & Barrett): front-of-pack “Bisglycinate 375 mg” is the compound amount; elemental magnesium is 85 mg per capsule, partly from magnesium oxide (95 mg oxide material listed alongside 375 mg bisglycinate).
CleanAssay lab-verified examples (same category)
| Product | Seller region | Form | Elemental Mg / serving | Price / day | Lab report on CleanAssay? | Page |
|---|---|---|---|---|---|---|
| GymBeam Magnesium Bisglycinate powder 250 g | EU (GymBeam) | Bisglycinate | 220 mg | €0.05–€0.10 | Yes — Lab verified | View → |
| HSN Magnesium Glycinate chelated 500 g | EU (HSN) | Bisglycinate | 330 mg | €0.15 | Yes — Lab verified | View → |
| CLN Labs Magnesium Bisglycinate 120 caps | UK (CLN Labs) | Bisglycinate | 308 mg | £0.30 | Yes — Lab verified | View → |
| Peak Supps Magnesium Glycinate 500 g | UK (Peak Supps) | Bisglycinate | 330 mg | £0.13 | No current verified report (listed Unverified) | View → |
| Inner Sparkle Bisglycinate 120 caps | EU | Bisglycinate | 300 mg | €0.30 | Yes — Lab verified | View → |
Full magnesium comparison (lab data, dose, price) →
What this page is not
- Not a recommendation to buy or avoid any retailer.
- Not a statement about heavy metals or purity of high-street stock without a published report.
- Not a label-score or “Index” page — those are separate and not used here.
FAQ
Why list high-street products without a lab report?
Because shoppers see them first. Showing form, elemental dose and price next to products that do publish a report makes the difference visible without guessing metals results that were never published.
Do you convert £ to €?
No. Each price stays in the currency of the seller we checked.
Is there an affiliate link to Holland & Barrett?
Not on this page. We may apply to their affiliate programme separately; rankings stay lab-data only.
- How to read a supplement lab report (COA) →
- Cleanest magnesium glycinate (lab-verified shortlist) →
- Supplement testing sites compared →
Sources
- Holland & Barrett UK: Magnesium Bisglycinate 375 mg, 90 capsules (product page, fetched 2 Nov 2026)
- Holland & Barrett Ireland: same SKU in EUR (product page, fetched 2 Nov 2026)
- Boots UK: Magnesium 375 mg, 180 tablets (product URL; direct fetch blocked — price mirrored)
- PerDose price check for Boots Magnesium 375 mg 180 tablets (£12.85, checked 15 Oct 2026)
- Superdrug marketplace: Nutravita Magnesium Glycinate 120 capsules (page copy, fetched 2 Nov 2026)
- EU Register of nutrition and health claims (authorised magnesium claims)
Information only, not medical advice. Food supplements are not intended to diagnose, treat, cure or prevent any disease. Speak to a healthcare professional before use, especially if pregnant or on medication. Prices and stock change; re-check the seller page before buying.