Why are some magnesium glycinate supplements 5x more expensive than others?

Three reasons drive the spread. First, branded raw materials (Albion's TRAACS, for example) carry IP licensing costs that generic bisglycinate powders do not. Second, true bisglycinate has only ~14% elemental magnesium by mass, so a fully-chelated product needs roughly 7 mg of compound per 1 mg of elemental magnesium — buffered products use cheaper magnesium oxide to bulk up the elemental dose. Third, UK and EU GMP-licensed manufacturing with full ICP-MS heavy-metal panels costs more than offshore manufacturing with minimal release testing. The price gap usually maps to those three factors stacking, not to the magnesium ion being chemically different.

What's the difference between bisglycinate and glycinate?

Chemically, magnesium bisglycinate is the precise term — one magnesium ion chelated to two glycine molecules. 'Magnesium glycinate' is the more common label phrasing, but in the supplement industry the two terms are used interchangeably. Where the distinction matters is when 'magnesium glycinate' on the front of the bottle is actually a glycinate-oxide blend on the back; the front label name is not a guaranteed indicator of the magnesium source.

How do I know my supplement is real bisglycinate vs a cheap blend?

Read the supplement-facts panel for the magnesium source — it will list 'magnesium bisglycinate' alone or 'magnesium bisglycinate, magnesium oxide' (the latter is buffered). Check the elemental-to-compound ratio: pure bisglycinate is ~14% elemental Mg, so a 100 mg elemental dose needs ~715 mg of compound. If the math gives a higher percentage, the product is buffered. Look for branded raw materials like Albion TRAACS on the marketing copy. Request a recent certificate of analysis from the brand showing identity testing (HPLC or FTIR) and heavy-metal panels.

Best per-capsule cost for genuine bisglycinate UK?

On April 2026 retail pricing, Wellgard's TRAACS-based bisglycinate at roughly £0.13 per capsule (240-cap pack on Amazon UK) is the lowest per-capsule cost we found for an unbuffered, branded-raw-material chelate of UK provenance. Bulk's bisglycinate is cheaper at £0.10 per capsule, but discloses oxide buffering on the label — useful if elemental dose is the priority but not strictly 'genuine pure bisglycinate'.

Does Holland & Barrett's own-brand contain real bisglycinate?

Holland & Barrett's own-brand magnesium bisglycinate sells in two SKUs depending on store. The cheaper SKU lists magnesium bisglycinate and magnesium oxide as the magnesium source, making it a buffered product rather than fully chelated. The premium SKU lists only magnesium bisglycinate. The label is the source of truth — read the magnesium-source line on the side panel of the specific bottle on the shelf, because reformulations are common in own-brand lines.

Does Solgar still test for heavy metals?

Solgar publishes a quality-and-purity statement covering identity, potency, heavy metals (As, Cd, Hg, Pb), microbiology, and stability for its mineral chelate products including Magnesium Bisglycinate. Batch-level certificates of analysis are not always published on the product page but are available on request via customer service. Solgar finishes its UK-shelf product in the USA under FDA cGMP and ships to a European warehouse for UK distribution.

Magnesium Glycinate Brand Comparison UK (2026): What's in Each Capsule

Nutripedia Research Team26 April 2026

Updated 5 May 2026

Two products labelled 'magnesium glycinate' can deliver wildly different amounts of actual magnesium per capsule. We compare the major UK brands on chelation purity, elemental magnesium percentage, fillers, manufacturing country, third-party testing, and real per-capsule cost — without giving any health advice.

Not medical advice

Nutripedia summarises published peer-reviewed research. This content is for informational purposes only and is not a substitute for professional medical advice. Product mentions are not endorsements.

Before You Read This

Nutripedia is a research librarian, not a doctor. Nothing on this page is medical advice. This article is a commercial comparison of products on the UK market in 2026 — it does not recommend that anyone take a supplement and does not interpret symptoms. Consult a UK GP, NHS pharmacist, or registered dietitian before starting any supplement, especially if you are pregnant, breastfeeding, on medication, or managing a chronic condition. The European Food Safety Authority sets the upper level for supplemental magnesium at 250 mg per day in adults; the NHS reference nutrient intake for total dietary magnesium is 270 mg/day for women and 300 mg/day for men. Brand prices in this guide reflect retail listings as observed in April 2026 and will move; always check the current label before buying.

Our research is based on 59 peer-reviewed studies. View the full evidence database

Our Top Picks

All Picks — Ranked

Frequently Asked Questions

Sources

Nutripedia is an educational resource. Content is sourced from peer-reviewed studies and does not constitute medical advice. Product mentions are not endorsements. Consult a healthcare professional before starting any supplement.

Reviewed by

Archie Roberts

Founder, Nutripedia — ALDR Ltd

This page summarises published research from PubMed, NHS, EFSA, and SACN. It does not constitute medical advice; consult a qualified healthcare professional before changing any supplement regimen.

Last reviewed: 05 May 2026Methodology