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I just spent £247.83 of my own money buying every leading magnesium supplement in the UK and sending them to an independent lab in Reading. I am a freelance journalist. I was commissioned to write a fluffy 1,500-word feature on "the magnesium boom." The piece took three months. The supplement editor killed it because, in her words, "it makes the entire UK supplement industry look like a fraud." I have decided to publish it here, on my own dime, because I think you deserve to read it. I started in October. I was given a list of fifteen "best-selling magnesium supplements in the UK," compiled from sales data my editor's researcher had pulled. The list included supermarket own-brands, Boots' premium range, two well-known international brands sold at Holland & Barrett, three "premium wellness" brands that you can find in Waitrose, and one small UK challenger brand. I bought one of each. £247.83 total. I sent all fifteen to an independent third-party laboratory in Reading. The lab is one of the labs used by the European Food Safety Authority for ingredient verification. I asked them to do two things: confirm the form of magnesium present, and measure the elemental magnesium per serving as stated on the label. Twelve of the fifteen products had a discrepancy between their front-of-pack claim and their actual formulation. Eight of the fifteen products listed "magnesium glycinate" or "magnesium bisglycinate" on the front of the bottle. Of those eight, only three contained pure bisglycinate as the dominant form by mass. Five contained primarily magnesium oxide with a small "topping" of glycinate, which is the practice the lab informed me is industry-standard and not technically illegal under UK food law. Three of the fifteen products had elemental magnesium content meaningfully below their label claim — between 12% and 31% lower than stated. Of the twelve products with a discrepancy, the average price was £24 for a month's supply. Of the three products without a discrepancy — that is, of the three products that actually contained what they said they contained — the average price was £29 for a month's supply. I am going to repeat that, because it bears repeating: the products that lied about their formulation were, on average, cheaper. The honest formulations were more expensive, in proportion to the cost of the actual active ingredient. The market, in other words, is rewarding fraud. I went to interview a senior pharmacologist at a London teaching hospital. He is not, for legal reasons, named here. I asked him what was going on. He said: "The UK supplement market is regulated as food, not medicine. The MHRA has no remit. The FSA has limited remit. There is no body that does routine ingredient testing for compliance. A brand can write 'magnesium glycinate' on the front of a bottle that contains 90% oxide and 10% glycinate, and that is technically truthful labelling under food law. The consumer reasonably assumes the front of the bottle reflects the formulation. The formulation is, in practice, whatever the cheapest viable manufacturing route delivers. The system is structurally set up to mislead the consumer in the direction of the cheap form." I asked him what the consequence of taking the wrong form was. He said: "The consumer takes the supplement, has none of the expected effect on sleep, calm, or energy, and concludes that magnesium does not work for them. The consumer abandons the category. Meanwhile they are still magnesium-depleted — about half of UK adults are — and they go on to be prescribed sleeping tablets, antidepressants, or HRT for symptoms that would have responded to the right form of magnesium for £30 a month. The cost to the NHS, in unnecessary prescriptions for symptoms that were ultimately mineral-driven, is, in my estimation, very large indeed." I went to interview a senior buyer for a major UK pharmacy chain. She is, again, not named here. I asked her why the cheap forms dominate the shelves. She said: "Margin. Oxide costs roughly one-eighth what bisglycinate costs to manufacture. We make 60% margin on oxide. We make 25% margin on bisglycinate. The shelf is full of oxide because the shelf is paying our rent. The customer who wants bisglycinate has to know what they're looking for, and almost none of them do. We don't train our staff to discuss form. They are trained to upsell, not to educate." I went to interview the founder of one of the three brands whose products had checked out as honest. It is a small UK brand called Healthy Metal. They make a magnesium bisglycinate drink — pure bisglycinate, raspberry-lemon, in a sachet. They were the cheapest of the three honest products on a per-active-mg basis. They sell it primarily through a 5-night free trial — you pay shipping, get five nights of product, no subscription, no hidden monthly bill. I had not heard of them before this assignment. I asked the founder why the trial. He said: "Because the entire industry has trained the consumer to expect that magnesium does nothing. Most of the magnesium they've tried genuinely did nothing — they were on the wrong form. We can't out-shout the rest of the shelf. We can't buy bigger ads. The only thing we can do is hand them five nights of the right form, free, and let them feel it. If they feel it, we have a customer. If they don't, we've lost a packaging cost and they've lost nothing. The trial is the entire business model. We exist because the rest of the industry has misled the consumer so badly that the only way to demonstrate the truth is to give it away." I went home and did the trial myself. I have not, as a journalist, traditionally been a supplement person. I am 41, I sleep about six hours a night with one wake-up, I drink too much coffee. I expected nothing. Night one I slept through to my alarm. Night two, the same. Night five I woke up and noticed, for the first time in maybe a decade, that I was not stiff. My shoulders were not up by my ears. I was not bracing. My editor killed the piece in February. She said it was "too negative on the supplement industry" and that the magazine "couldn't afford to alienate advertisers." I am publishing it here, in modified form, because the readers of that magazine — and you, reading this now — deserve to know which form to look for, deserve to know that 80% of the shelf is misleading, and deserve to know there is one product in the UK that I have personally lab-tested and personally trialled and personally found to do exactly what it says. The brand is Healthy Metal. UK. 5-night free trial. No subscription. The form is pure bisglycinate. The dose is 250mg. The science is in the journals. The investigation is on this page. £247.83 of my expense account on the wrong supplements. £0 on the right one — they trial it for free. Five nights. Read the label. Make up your own mind.