British Supplements Clean Genuine Magnesium 1,404mg Review
British Supplements · Last updated 10 April 2026
Trust Checklist3/6 passed
3rd Party Batch Tested
No public 3rd party batch test results available
No Fillers or Binders
100% active ingredient — nothing but magnesium in the capsule
No Oxide Buffering
No evidence of undisclosed magnesium oxide
Pure Magnesium Glycinate
Contains glycinate but may include other forms
GMP Certified Facility
GMP certification not confirmed
Made in the UK
Manufactured in the United Kingdom
Rating Breakdown
Pros & Cons
Pros
- Genuinely clean formula — no fillers, binders, talc, or additives
- 100% active ingredient in every capsule
- No oxide buffering — the maths add up with the stated forms
- Three premium forms: bisglycinate, malate, and aspartate
- UK manufactured, vegan, gluten-free, BPA-free packaging
Cons
- Only 140mg elemental magnesium per serving — well below the 375mg NRV
- You'd need nearly 3 servings (6 capsules) daily to match competitors' elemental doses
- Relatively expensive for what you're getting per mg of magnesium
- Limited to their own website — not widely available
- The 1,404mg headline number looks impressive but the elemental yield is low
Product Details
- Magnesium Form
- Multi-form (Bisglycinate, Malate, Aspartate — 1:1:1 ratio)
- Dosage per Serving
- 1,404mg magnesium blend (bisglycinate + malate + aspartate)
- Elemental Magnesium
- 140mg
- Serving Size
- 2 capsules
- Servings per Container
- 30
- Price
- £14.42
- Price per Serving
- £0.48
- Certifications
- Made in UK, Vegan, Gluten Free, BPA Free Packaging
Full Review
Ingredient Quality
British Supplements has built its brand around the 'clean' concept — every capsule contains only the active magnesium blend with no fillers, binders, talc, or excipients. The formula uses a 1:1:1 ratio of magnesium bisglycinate, malate, and aspartate, which are all well-absorbed premium forms. The company makes a point of contrasting their approach with competitors who pad capsules with inactive ingredients.
On ingredient purity, they deliver. There's no evidence of oxide buffering, and the elemental magnesium claim of approximately 140mg from 1,404mg of blend is mathematically consistent with the stated forms. This is honest labelling.
Value Analysis
At £14.42 for 60 capsules (30 servings), the cost per serving is roughly 48p. But the cost per gram of elemental magnesium is higher than competitors offering 300mg+ per serving. To reach a comparable daily dose of 300mg elemental, you'd need approximately 4–6 capsules per day, burning through a bottle in 10–15 days. At that rate, monthly costs would exceed £30–£40 — significantly more than alternatives delivering higher elemental doses.
Effectiveness
The three magnesium forms used are all genuinely well-absorbed — bisglycinate for relaxation, malate for energy, aspartate for general cellular function. The issue isn't the form; it's the quantity. At 140mg elemental per serving, you're only getting about 37% of the 375mg NRV. For someone already eating a magnesium-rich diet, this might serve as a top-up. For anyone with a deficiency or higher requirements, it's insufficient as a sole supplement.
Who Is This Best For?
British Supplements is for purists who value absolute ingredient cleanliness above all else and are willing to accept a lower dose in exchange. If your priority is zero fillers and you're supplementing alongside a high-magnesium diet, this could work as a gentle daily top-up. For most people seeking meaningful magnesium supplementation, the dose is too low to justify the cost.
Where to Buy
Prices are approximate and may vary. As an affiliate, we may earn a commission from qualifying purchases at no extra cost to you. This does not influence our reviews or rankings of British Supplements Clean Genuine Magnesium 1,404mg.
British Supplements Clean Genuine Magnesium 1,404mg FAQ
Why is the elemental magnesium so low despite the 1,404mg headline?
The 1,404mg refers to the total weight of the magnesium compounds (bisglycinate, malate, and aspartate), not elemental magnesium. Each form only contains about 10–15% elemental magnesium by weight. This is normal and honest — the issue is that the headline number can be misleading to consumers who confuse compound weight with elemental content.
Is British Supplements Magnesium genuinely filler-free?
Yes — the company claims each capsule contains only the active magnesium blend with no fillers, binders, talc, flow agents, or other excipients. This is a genuine differentiator in a market where most capsule products contain at least some inactive ingredients.