NF Supplements
NF Supplements
Read this before you buy your next bottle from Amazon. Especially if you've tried Nutrition Geeks, Free Soul, Zipvit, or any of the "best-seller" magnesium supplements selling for under a tenner.
Most UK magnesium brands send one early batch to a lab, get a clean certificate, and put that test on their website forever. The next 50 batches? Never re-tested. You're trusting a result from a batch that's no longer in production.
NF Magnesium Glycinate is third-party tested at an accredited UK lab on every single batch we manufacture. Every bottle has a QR code on the back. Scan it, and you're taken straight to the Certificate of Analysis for the exact batch in your hand. The full archive is published at testing.nfsupplements.co.uk. If a batch doesn't match the label, it doesn't go out the door.
Don't take our word for it. Don't take a brand's word for it. Take the lab's word for it — and then check that the lab tested this batch.
See The 3rd Party Test For THIS Batch →
We bought the top 5 best-selling magnesium supplements on Amazon UK. Sent two of every bottle to an ISO 17025-accredited lab. Kept one back, in case any of them tried to claim we'd swapped capsules.
Here's what came back:
Every single one is using the same trick. They mix cheap magnesium oxide into "glycinate" formulas to inflate the elemental number on the label. Oxide is 63% elemental on paper, but your body absorbs around 4% of it. Glycinate is only 13% elemental — but your body absorbs 40–50% of it.
What's worse: some brands actually print it on the label. Free Soul calls their formula "buffered" right on the bottle — that's the legal way of admitting they're cutting their glycinate with oxide. Most don't even bother with that — they just hide the oxide entirely and let the maths do the lying for them.
They pick oxide because it lets them print a bigger number on the bottle. We picked glycinate because it actually works.
Where's The Proof Other Brands Do This? →Buy two bottles of NF Magnesium Glycinate and we'll throw in a third bottle of magnesium glycinate free, a full bottle of Vitamin D3 + K2 free, and a free eBook on how to get the most out of your supplement — sent to your inbox the moment you order.
🎁 First Batch · Launch Bundle
This is our first batch of NF Magnesium Glycinate. The price you see today isn't the long-term price — it's the launch offer. Once this batch sells through, the bundle goes away and we re-price at the standard rate.
Here's what's in the launch bundle:
When the first batch sells through, the bundle is gone. The eBook and free D3 + K2 don't come back.
Save 50% Today + Free D3 + K2 →Take any UK magnesium bottle off the shelf. If they claim more than 13% elemental from "magnesium glycinate", it's mathematically impossible without hidden oxide. We had this confirmed by the UK's largest magnesium ingredient supplier. They had no idea why brands are allowed to do it either.
Run the numbers on Nutrition Geeks' best-selling product:
That 130mg hole in the maths can only be filled by one thing: magnesium oxide, the cheapest form of magnesium money can buy. ~217mg of hidden oxide explains the gap exactly. They don't list it on the label.
Now run the same maths on us:
That's a chemistry fact. Anything higher means hidden oxide.
Our 13% is the honest signature of pure glycinate. Anyone claiming higher is hiding oxide.
A 500mg "elemental magnesium" claim on a label means almost nothing if most of it comes from oxide. Your body only absorbs around 4% of oxide. That's roughly 20mg actually reaching your bloodstream from a 500mg label number.
And here's what the industry won't say out loud: most "glycinate" brands buffer their formula with around 30% magnesium oxide. That means roughly one in every three milligrams in the capsule is barely being absorbed. You paid for glycinate. You're getting two-thirds glycinate and one-third filler that mostly passes straight through you.
NF's 338mg is pure glycinate. No oxide cut. No filler. At 40–50% absorption, that's 135–170mg of usable magnesium reaching your tissues. We deliver more bioavailable magnesium than brands printing far bigger numbers on their bottles — because none of ours is wasted.
A smaller number you absorb beats a big number you don't.
50% of 500 is 250.
4% of 1000 is 40.
One looks better. The other is better.
Almost every supplement brand on Amazon UK doesn't actually make their supplements. They source from third-party manufacturers, who source from contract labs, who source from wholesale ingredients no one in the chain has personally verified.
NF Magnesium Glycinate is manufactured in our own GMP-certified facility in Kidlington, just outside Oxford. We mix the powder. We fill the capsules. We seal the bottles. We can't blame a contract manufacturer if anything is wrong, because there isn't one.
That's not a marketing line. That's how a UK brand actually controls what ends up in your capsule.
On a label, the highest numbers look like the winners. Free Soul claims 385mg. Nutrition Geeks claims 384mg. Zipvit claims 400mg. NF claims 338mg — a smaller number than three of the bestsellers.
But there's only one figure that actually matters: how much magnesium reaches your bloodstream. Adjust each brand for the absorption rates of the specific forms inside the bottle, and the rankings flip:
~152mg of bioavailable magnesium per serving. The highest of any UK magnesium we tested. Nearly 2x more usable magnesium than Nutrition Geeks — the country's #1 bestseller. Almost 3x more than Free Soul, despite their label claiming 47mg more than ours.
Two reasons we win:
Most brands compromise on dose or compromise on quality to fake the other. We just used more of the good stuff.
Where's The Proof Other Brands Do This? →The science on glycinate is specific. It crosses into the bloodstream more efficiently than oxide, citrate, or any of the other major forms. It's the form most consistently linked in the research to:
• Faster sleep onset and deeper sleep
• Lower stress reactivity and a calmer nervous system
• Fewer overnight muscle cramps
• Steadier heart rhythm and better blood pressure regulation
None of that holds for oxide. None of that holds for "buffered" blends where oxide is doing the heavy lifting. You bought magnesium for a reason. Glycinate is the form that does the thing you bought it for.
See The Magnesium Glycinate Research →Two full months to feel the difference. If sleep doesn't improve. If your cramps don't ease. If you don't feel calmer. Email us. We refund you.
No "send back the empty bottle" trick. No 14-day window that runs out before the magnesium has even built up in your system. 60 days. Full refund. On us.
The reason we can do this is simple: most people who try it never ask for one back.
You didn't read this far to go back to the £9.99 bestsellers. You read this far because you want the magnesium your body can actually use, made by the brand willing to publish every test result.
🎁 SAVE 50% + FREE D3 + K2 BUNDLE
