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UK's only batch-tested magnesium

The Only UK Batch 3rd Party Tested Magnesium.

Most "glycinate" supplements on Amazon are secretly cut with cheap magnesium oxide your body absorbs at 4%. We sent the top 5 sellers to a lab and proved it. So we built the one bottle whose label maths actually adds up — and we test every batch to keep proving it.

2,600mg pure glycinate 337mg elemental Mg Zero oxide. Zero buffering. Made in Oxford, UK
Live · Scan your batch
Scan QR code on the bottle to see your batch test
Every Batch Lab-TestedNot every year. Every batch.
Made in Oxford, UKOur own facility
Zero Hidden OxidePure bisglycinate only
60-Day GuaranteeRefund. Keep the bottle.
QR Code on BottleRead your batch's report
I sent the competition to a lab

The numbers on most magnesium bottles are mathematically impossible.

I bought the UK's top 5 magnesium bestsellers, sent them to an independent lab, and filmed the whole thing.

I 3rd party tested the top 5 magnesium supplements on Amazon UK
Watch: I 3rd party tested the top 5 magnesium supplements on Amazon UK — what the lab found

The verdict? Every single one is cut with magnesium oxide — and none of them put it on the label.

Oxide is the cheapest magnesium money can buy. Your body absorbs about 4% of it. They mix it into "glycinate" products to inflate the number on the front of the bottle. You think you're getting premium glycinate. You're really swallowing watered-down oxide that goes straight through you.

Every. Single. Bestseller. Hiding cheap oxide they don't put on the label.

UK Magnesium Lab Report · 5-brand test

Verified by independent UK lab
Brand Form claimed Label says Lab found £ per g elemental Verdict
Nutrition Geeks 3-in-1 Glycinate + malate + citrate 384mg 385mg 58p 130mg gap
Maths only adds to 254mg — the missing 130mg can only be undeclared oxide.
Zipvit Glycinate "Glycinate" 400mg 384mg 52p 96% of label
Same buffering trick — only way to hit 400mg is oxide.
Sport Supplies Glycinate "Glycinate" 315mg 291mg 57p 8% under-dosed
Just plain didn't hit the label.
Free Soul 4-in-1 "Buffered" blend 385mg 385mg 86p Says "buffered"
Word "buffered" on the bottle = oxide. Slightly more open, still cut with oxide.
Novomins Gummies Citrate 60mg 62.8mg £5.30 Honest but tiny
Real dose, but citrate is poorly absorbed and the amount is negligible.
NF Magnesium Glycinate 100% Bisglycinate 337mg 337mg (every batch) 67p PURE GLYCINATE
2,600 × 13% = 338mg. The only formula whose maths physically works.
It's physically impossible to have elemental magnesium levels for magnesium glycinate over 14%. I don't know why it's allowed.
— UK's leading magnesium supplier, on record
The chemistry the industry hopes you don't run

If you don't absorb it, it's a waste of money.

It's not about what's on the label. It's about what your body absorbs. Calculator out, two numbers below.

Their bottle

500mg "Oxide-buffered"

Cheap. Hidden. ~60% elemental on paper.
500mg dose
× 60% elemental
× 4% absorbed by gut
──────────────
~12mg actually absorbed
NF bottle

337mg Pure Glycinate

Expensive. Honest. 13% elemental.
2,600mg bisglycinate
× 13% elemental = 338mg
× ~45% absorbed by gut
──────────────
~152mg actually absorbed

45% of 337 is 152.
4% of 500 is 12.
One looks better on the shelf. One actually works.

The thing nobody else in the UK does

Every. Single. Batch. Lab-tested before it ships.

Most "third-party tested" claims you see on supplement bottles mean one test, done once, on one batch — usually years ago. Every batch since has been on the honour system.

We don't do honour-system magnesium. Every production run gets sent to an independent UK lab. The batch sits in our Oxford warehouse until the lab confirms it hits spec. If it fails, it gets destroyed. You scan the QR code on your bottle and pull up the lab report for your batch. Not the founder's batch. Not the press kit batch. Yours.

Our Pick
NF Magnesium Bisglycinate bottle
NF Magnesium
Amazon bestseller magnesium bottle
Amazon Best-Sellers
100% pure magnesium bisglycinate
No hidden magnesium oxide
Every batch lab-tested before it ships Once, years ago
QR code on bottle → your batch's lab report
Label maths physically adds up On paper only
Made in our own UK facility
90% RI of elemental magnesium per serving On paper
60-day money-back guarantee
Why this even matters

Magnesium runs 300+ reactions in your body. Around 60% of UK adults don't get enough.

It lives in foods nobody's eating in 2026 — spinach, pumpkin seeds, black beans. Properly-absorbed magnesium can support:

Sleep

Calms the nervous system that won't switch off at 11pm.

Muscle Cramps & Recovery

The one your physio keeps telling you to take. Better leg cramps. Faster recovery between sessions.

Stress & Mood

Magnesium is a co-factor in serotonin production. Glycine has its own calming effect too.

Heart Rhythm

Supports normal cardiac muscle function. The mineral your cardiologist wishes you ate more of.

Bone Density

Works hand-in-hand with calcium and vitamin D. The supporting actor that gets no credit.

Gentle Digestion

Glycinate doesn't send you running to the toilet. That's the citrate and oxide trick — not ours.

The catch: none of this works if your body can't absorb the magnesium in the capsule. Which brings us back to the only one that adds up.

Real customers · Real reviews

People are switching to a 3rd party tested magnesium supplement.

Hundreds of UK customers have switched from the Amazon bestsellers to NF Magnesium. Hover to pause.

Customer review Customer review Customer review Customer review Customer review Customer review
Customer review Customer review Customer review Customer review Customer review
Choose Your Plan

NF Magnesium Bisglycinate — 2,600mg · 337mg elemental

★★★★★ 2,140+ verified UK reviews

Delivered Monthly

30 Day Supply

Just 67p per day
NF Magnesium Bisglycinate — 1 bottle
30 Day Supply (1 Bottle)£19.99
£19.99
Or 4 interest-free payments of £5.00 with Klarna
Autoship — save 10% on future orders
Cancel anytime, no lock-in
Lab-tested every batch
Delivery every 30 days
Real customers, real results
★★★★★

From a sceptic. Im 44, work in engineering, fairly sciency brain, generally think most supplements are marketing wrapped around a placebo. First week nothing. Then around day 9 I noticed id slept through the whole night, which doesnt happen. Then it happened again the next night. Now at 19 days I can say with reasonable confidence this is doing something. What I appreciate about NF is the transparency — they publish the actual lab tests and the formulation is properly dosed unlike the garbage in boots.

C
Claire Verified buyer
★★★★★

Leg cramps sorted. Used to wake up in agony with calf cramps, like screaming pain. Havent had one since starting this about 12 days ago. Cant comment on the sleep stuff other people mention because I already sleep ok, but for cramps its been a game changer. 3 caps before bed, easy routine.

S
Stephen Verified buyer
★★★★★

Swap from citrate. Was on magnesium citrate which was giving me urgent loo visits most mornings. Switched to this glycinate formula. Stomach is calm. Sleep is better. Much happier.

L
Lucy Verified buyer
★★★★★

Migraine frequency down. Ive had chronic migraines for over 15 years. Neurologist mentioned magnesium glycinate ages ago but i never got round to it properly. Ordered this after seeing the detailed info on dosing. Been on it nearly 3 weeks. Ive had 2 migraines in that time vs my usual 5 or 6. Too early to call it conclusive but the trend is good. The dose is what matters with magnesium for migraine apparently, most brands underdose massively. NF get it right.

R
R.C. Verified buyer
★★★★★

Heart palpitations gone. I was getting horrible heart palpitations, skipped beats, scary stuff. All heart tests came back fine. Doctor said probably stress/caffeine/sleep. I reduced coffee, improved sleep hygiene, and added this magnesium. 2 weeks later and the palpitations have gone from multiple times a day to basically not happening. I cant say which bit fixed it but magnesium is known to help with cardiac electrical stuff and i believe this contributed massively.

J
Jessica Verified buyer
★★★★★

Perimenopause lifesaver. Im 49 and peri has been destroying me. Night sweats, no sleep, mood swings, anxiety out of nowhere. Someone in a facebook perimenopause group recommended this. Im into week 3 and i want to cry with how much better im feeling. Sleep has come back, not perfect but way better. The anxiety has calmed down noticeably. If youre peri please try this — it wont fix everything but it might give you enough of your life back to think straight.

L
L. (49) Verified buyer
★★★★★

Helped my jaw clenching. Ive been clenching my jaw at night for ages, woke up with headaches and a sore face most mornings. My dentist actually suggested trying magnesium before going down the mouthguard route. 2 weeks in and the clenching has reduced a lot according to my wife who used to hear me grinding. Headaches are less frequent too. Give it a go before you spend £300 on a custom guard honestly.

C
Charlotte Verified buyer
★★★★★

Proper thorough brand. Im a vegan and checking every supplement for hidden animal products is a pain. NF have been really clear about their capsules being vegetarian friendly which i appreciate. Product itself is solid — im 2 weeks in and sleep is the main thing ive noticed, deeper and more continuous. Also the amount of info they send is great, properly educational about how the form of magnesium matters and how most brands are basically taking the mick. 5 stars from me.

R
Ryan Verified buyer
60 Day Guarantee

The "Run The Maths" Guarantee.

Take NF Magnesium Glycinate for 60 nights. Sleep on it. Train on it. Run the maths on the label. Scan your QR code and read your batch report.

If you don't notice a difference — or if you ever find a single milligram of undeclared oxide in our formula — email us and we'll refund every penny. Keep the bottle.

We can afford to promise this because the lab makes us prove it before we ship it.

Common questions

Questions worth a calculator.

Why is your elemental number "smaller" than other brands?
Because ours is real. Pure magnesium bisglycinate is mathematically 13% elemental — the higher numbers on competitor bottles are only possible with hidden oxide. We'd rather show a smaller number you absorb than a bigger one you don't.
What does "batch-tested" actually mean?
Every single production run gets sent to an independent UK lab. The batch is held in our Oxford warehouse until the lab confirms it hits spec. If it fails, it gets destroyed. Your bottle's QR code links to the report for your specific batch — not a marketing batch from years ago.
Will this make me run to the toilet like other magnesium did?
No. That's the citrate and oxide trick. Magnesium bisglycinate is the gentle form — the magnesium is bound to glycine (an amino acid) which absorbs cleanly without the laxative effect.
When should I take it?
Most customers take 2 capsules 30–60 minutes before bed for the sleep and recovery benefits. Some split the dose — one in the morning, one before bed. Both work.
How long until I notice anything?
Most customers report better sleep within 5–10 nights. Cramping and recovery: usually inside 2 weeks. Mood and stress: 3–4 weeks of consistent use. Magnesium is a slow build — your tissues are restocking depleted reserves.
Is it suitable for vegans, gluten-free diets, or pregnancy?
Vegan ✓. Gluten-free ✓. Non-GMO ✓. For pregnancy, please consult your GP first — standard advice for any supplement during pregnancy.
Why are you cheaper than the £40 "premium" brands?
We sell direct from our Oxford facility. No Amazon 30% fee. No retailer markup. No paid celebrity endorsement. You're paying for the magnesium and the lab work — not the supply chain.
What if it doesn't work for me?
Email us within 60 days. We'll refund every penny — keep the bottle. No forms, no return shipping, no awkward phone calls.

Stop guessing what's in the capsule. Check the maths.

Every other UK magnesium asks you to trust them. We ask you to check the maths, scan the code, and read the report for your batch. That's the standard supplements should have always been held to. Now you can finally buy from the brand that holds itself to it.

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