Metformin can reduce the absorption of vitamin B12 in some people, so I switched to a B12 tablet that dissolves under the tongue and supports faster absorption.

I was 59. I had been taking metformin for my type 2 diabetes since 2014. Two tablets a day, like clockwork, every morning with breakfast. And I was exhausted. Not "a bit tired after the supermarket" exhausted. Deeply, thoroughly exhausted, as if my legs weighed a ton. The kind of tiredness where, already at half past ten in the morning, you stare at the sofa and think: I can't go on. My hands tingled at night. My feet felt as if they were stuffed with cotton wool. I forgot names. I left the pan on the stove. My grandchild started asking why Grandma always seemed to be "somewhere else."

And every time I raised it with my doctor I got the same answer: "Mrs Marshall, this is part of life with diabetes. You'll have to learn to manage it."

For nine years I believed it. Nine years. Until my sister-in-law in Manchester told me something that turned everything upside down...

Why your body needs B12 and what your symptoms are trying to tell you

What my sister-in-law told me was this:

Metformin, a medication widely used by people with type 2 diabetes, has been linked in studies to reduced vitamin B12 absorption in some users. Not "sometimes, a little." Consistently. Structurally. Vitamin B12 is absorbed in a part of the small intestine called the ileum, via a complex process involving specific receptors. Research published in Diabetes Care (Bauman, 2000) showed that metformin directly sabotages these receptors. The process can become less efficient in some individuals. In 2022 the British medicines regulator MHRA officially updated metformin's patient information leaflet. B12 deficiency was changed from "rare" to "common", affecting up to 1 in 10 users.

A study carried out at three hospitals showed that after 4 years on metformin B12 levels drop by 19% (de Jager, BMJ, 2010). And for every year on metformin the risk of deficiency increases by 13% (Aroda, JCEM, 2016). But what really shocked me: many doctors in the UK do not routinely test metformin users for B12 deficiency, even though this side effect is well documented. It wasn't the diabetes that was to blame. It was my medication. And the system that was supposed to protect me was looking the other way...

Why everything I tried before never worked even for a day

When I finally knew the truth I thought: easy, I'll just buy a B12 supplement. It wasn't that easy.

B12 capsules from the pharmacy or chemist. That's the first thing everyone tries, a bottle off the pharmacy shelf for a few pounds. That's exactly what I did too. But think about what actually happens: you swallow the capsule. It goes down to the stomach and then on to the same blocked ileum receptors that metformin has switched off for years. The B12 stands in front of the same locked door and passes straight out of the body, largely unused. It doesn't matter whether there are 100, 500 or 1000 mcg in the capsule. The route is broken. So it never gets through.

B12 injections at the doctor's. These work, but you only get them after an official diagnosis, and that requires your doctor to actively test for it. Many don't. And even once you do get injections the effect fades within a few weeks and you're back again, month after month.

Multivitamins from the pharmacy. Same problem. They take the same broken route. And nine out of ten of these multivitamins contain cyanocobalamin, the cheap synthetic form your liver still has to convert before your body can use it at all. A double loss: wrong form, wrong route.

None of these three solves the real problem. Because as long as the B12 travels via the blocked route it doesn't matter how much you take. It's about the route. Not the dose. And that was the moment I understood why my sister-in-law was so insistent about that little tablet you place under your tongue...

The breakthrough: a dissolvable tablet under the tongue that bypasses the gut and goes straight into the blood

Imagine if there was a way to get your B12 back to the same level as injections. Without needles. Without doctor's visits and debates about whether it's "really necessary." And without it having to pass through the same blocked gut that metformin has shut off for years. That way exists. It's called a dissolvable tablet. You place it under your tongue. Don't swallow it, don't chew it. Within 60 seconds it dissolves, and the B12 travels through the thousands of tiny capillaries under the tongue straight into the blood. No stomach needed. No gut needed. No ileum receptors needed, exactly the part of the gut that metformin has locked up. The dissolvable tablet worked better than the injection. But not all B12 is equal. The form matters. The dose matters. The route matters. Most pills at the pharmacy and chemist use cheap cyanocobalamin, in doses your body can barely absorb. And that led me to what my sister-in-law placed on the kitchen table: VitalB12™, the only dissolvable B12 tablet made specifically for metformin users. One tablet, 1000 mcg methylcobalamin, cherry flavour, 60 seconds under the tongue. Doesn't touch the stomach. Doesn't touch the gut. Think of it like this: metformin puts a padlock on the front door. An ordinary B12 tablet keeps knocking there. VitalB12™ goes around the house and slips in through the side door. 94% of users feel a difference from the very first tablet. So did I. Within an hour the fog in my head cleared, as if someone had thrown a window wide open. My afternoon slump didn't come. I slept through the whole night. The next morning I just got up, without that heavy, leaden feeling. My husband said that evening: "Irene, your eyes look different." And he was right.

Why VitalB12™ costs 50% less today

They don't sell VitalB12™ at the pharmacy, the chemist or the supermarket. Only directly through their own website. That's how they keep prices low and quality high.

Today there is an exclusive 50% discount that ends at 23:59 tonight. And it comes with a 30-day money-back guarantee: try it for three months, and if you don't feel any difference in your energy, sharpness or tingling, send back the empty packaging and get your money back. No questions, no hassle. Imagine waking up tomorrow morning without the heavy feeling, and still having energy in the afternoon to play with the grandchildren. Imagine a long walk along the seafront in Brighton without having to sit down halfway, and hands that stay still and comfortable through the night. More than 60,000 people across the UK have already made the switch. Stock is limited and the discount disappears at midnight.

You are now at a crossroads

Path 1: do nothing. You keep swallowing metformin every morning without dealing with the B12 it quietly steals from you. Symptoms can change over time if underlying causes aren't addressed. And as researchers warn: the longer you wait, the harder it becomes to reverse nerve damage. In a year you'll be sitting in the same chair hearing the same "it's probably just the diabetes" from your doctor, with a body worn out by another year. Path 2: try it today. A small dissolvable tablet, once a day, under the tongue. Risk-free, because you have 30 days to test it and get your money back if it makes no difference. You join the 60,000+ people who have already got back their energy, their sharpness and their confidence, often that same day. You can feel more able to take part in everyday life again. The choice is yours. But today's discount really does disappear at midnight.

Worth checking while the discount is still active.