| Magnesium XXL | High Street Magnesium | |
|---|---|---|
| Absorption | 4 Chelated Forms, Readily Absorbed | Magnesium Oxide, ~4% Absorbed |
| Magnesium Content | 298mg Elemental — 79% Of Your NRV | 50–100mg, Buried In The Small Print |
| Forms | 4 Distinct Forms + Activated B6 | 1 Cheap Form, Nothing Else |
| Digestion | Gentle — No Laxative Effect | The Familiar Urgent Dash |
| Dosing | Every Milligram Printed On The Label | Underdosed "Proprietary Blend" |
Most magnesium on the shelf is one cheap salt doing one job badly. Magnesium XXL is four chelated forms plus activated B6, each chosen for a different system in your body. 298mg of elemental magnesium — 79% of your daily NRV — and not a single milligram of oxide.
Magnesium L-Threonate was only added to the UK's permitted list of mineral sources on 12th August 2026, after review by the Advisory Committee on Novel Foods and Processes. Magnesium XXL carries 2,000mg of it. Most British brands are still selling the formula they were selling in 2019.
Magnesium contributes to the reduction of tiredness and fatigue. Bisglycinate is magnesium bound to glycine, one of the gentlest and best-absorbed forms there is — which matters, because the magnesium that doesn't get absorbed can't do anything for you at all.
Magnesium contributes to normal energy-yielding metabolism, and malate plugs straight into the Krebs cycle — the exact place your cells turn food into fuel. No caffeine, no jitters, no spike and crash. Just the raw material your body already uses.
Magnesium contributes to normal muscle function and to the normal functioning of the nervous system. Taurate pairs it with taurine, the amino acid concentrated in nerve and heart tissue. If your legs have opinions at 11pm, this is the form worth reading about.
Buy three bottles of Magnesium XXL, get two bottles FREE — plus the Magnesium Bible, the Sleep Protocol and the Sleep Stack Guide at no extra cost. Free UK delivery, VAT included, nothing added at checkout. This offer runs through the weekend.
Most cheap magnesium is oxide — absorbed at around 4%, so the rest sits in your gut and pulls water in. That's the effect you've already met. Magnesium XXL uses chelated forms only, so it's gentle enough to take on an empty stomach.
Vitamin B6 contributes to the reduction of tiredness and fatigue and to normal psychological function. Cheap formulas use pyridoxine, which your liver still has to convert. We use P-5-P, already in its active form, at a level within UK safe intake guidance.
Every batch is independently tested for purity and potency and manufactured in a GMP-certified facility. Our L-Threonate meets the purity criteria written into UK law this year — arsenic, lead, cadmium and mercury all tested to the legal limits. No blends. No hiding.
We're so confident this is the last magnesium you'll ever need. If Magnesium XXL doesn't leave you less run-down, with steadier energy right through the day, we'll give you 90 full days to get every penny back — on top of your statutory 14-day right to cancel. What have you got to lose besides another week of running on empty?
For a limited time, get Britain's most complete magnesium formula at our lowest price of the year
I've worked my way through half the magnesium on Boots' shelves looking for one that does more than nothing. I finally found it. Magnesium XXL is the real thing. I'd recommend it to anyone who's permanently running on empty like I was.
Todd O. | Verified CustomerI'm not a supplements person and I wasn't expecting much. Three weeks on Magnesium XXL and I just feel steadier through the day. That 3pm wall I used to hit stopped turning up.
Timothy B. | Verified CustomerI'd tried glycinate on its own and it did a bit. Magnesium XXL does something else entirely. I notice it on the days I forget to take it, which is the only test that really counts.
Mitchell C. | Verified CustomerEvery other magnesium I've taken sent me straight to the loo, so I'd given up on it altogether. This one I can take on an empty stomach with no problems at all. First one I've actually stayed on.
Steven C. | Verified CustomerThis is the most complete magnesium I've come across in the UK. Four forms, every dose printed on the label, nothing hidden in a "blend". That was enough to get me to try it, and I've stayed on it since.
Gordon G. | Verified CustomerMy legs used to have a mind of their own of an evening. That's settled down a lot since I started Magnesium XXL. Small thing, big difference.
Guy M. | Verified CustomerI was put off by four a day at first. In practice they're small, they go down easily and I take them with dinner. I'd rather take four that are properly dosed than one that isn't.
Gary S. | Verified CustomerMy 78-year-old mother takes it with her evening meal and has had no bother with the capsules whatsoever. She's got a lot more go in her and has asked me to order a second lot.
Anne-Marie A. | Verified CustomerFood supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the stated dose. Keep out of reach of young children. If you are pregnant, breastfeeding, taking medication or under medical supervision, consult your doctor or pharmacist before use.