B12 isn’t really about being vegan. It’s about your gut.

There's no better place to start a conversation about absorption than the vitamin everyone thinks they already understand: B12.

Ask most people why vegans take a B12 supplement and you'll get the same answer: "there's no B12 in plants." True, as far as it goes. But it quietly skips the more interesting half of the story, the half that explains why plenty of committed meat-eaters are walking around low on B12 too.

B12 isn't really a diet question. It's an absorption question. And absorption happens in your gut.

Before the mechanism, the motivation. B12 does a lot of quiet, essential work. It helps your body make healthy red blood cells, it keeps your nervous system insulated and firing properly, and it's involved in producing the energy your cells run on and the DNA they copy. It is not a vitamin you want to coast on.

When levels drop, the signs are easy to misread because they're so ordinary: persistent tiredness, brain fog, pins and needles or numbness in hands and feet, a sore or strangely smooth tongue, low mood, breathlessness. People put these down to a busy life for months before B12 gets a mention. A simple blood test settles it, and it's well worth asking for one if any of that sounds familiar.

Here's the bit nobody prints on the steak. Animals don't make B12 either. Bacteria make B12: microbes living in soil, water, and the guts of animals. A cow is essentially a large, inefficient delivery vehicle for the bacteria fermenting away in its stomachs. We've simply spent a few thousand years treating that as the obvious place to get it from.

So "plants don't contain B12" is true, but it was never the whole equation. The vitamin is bacterial. The real question is whether your body can get it out of your food and into your blood.

Mostly because plant-based eaters were the first to take B12 seriously, which makes them the easy example. If anything, that's a point in their favour. Anyone eating plant-based already knows to supplement B12 and tends to be exactly the sort of person who reads labels and checks their levels. That's not a weakness in the diet. That's being a step ahead of the average shopper, who's getting B12 by happy accident and assuming their gut will keep cooperating forever.

The honest framing is this: a plant-based diet makes a B12 supplement a deliberate, sensible part of the plan. A less-than-perfect gut makes one a good idea for a lot of people who'd never call themselves vegan and have never given absorption a second thought. Same supplement, two different reasons, and the plant-based crowd just happened to work it out first.

This is where the mechanism stops being trivia and starts being useful.

A sublingual B12, one that dissolves under the tongue, is absorbed across the thin tissue of the mouth and goes more or less straight into the bloodstream. It doesn't lean on stomach acid to free it. It doesn't depend much on intrinsic factor. It doesn't need the terminal ileum to be on top form. It sidesteps the obstacle course almost entirely, which is genuinely useful if you're older, on long-term acid-lowering medication, or simply suspect your gut isn't pulling its weight.

That's the thinking behind our Vegan B12 Sublingual 100mcg. The dose looks small next to a four-figure tablet, and that's the point: when you absorb across the mouth rather than fighting through the gut, you don't need to overload the front door to get enough through it.

For everyone whose absorption works fine, there's the Vegan B12 1000mcg Sustained Release. Your body only takes up a fraction of any single oral dose of B12 at a time, so the higher dose and slow, steady release give your gut a longer, gentler window to do its job. One swallowed tablet, all day to absorb it.

Both use methylcobalamin and adenosylcobalamin, the active forms your cells use directly, rather than cyanocobalamin, the cheaper form your body has to convert first. We're geeky about that distinction because it's the difference between handing your body B12 and handing it homework.

If you're plant-based, take a B12, and take the small credit for being ahead on this one. But don't file it under "the price of the diet" and move on. File it under "my gut absorption is worth understanding," because that framing is truer, and it quietly applies to a lot more people than just the vegans.

The vitamin was always bacterial. The bottleneck was always the gut. Once you see B12 that way, choosing the right one stops being about your diet and starts being about your absorption, and that's a question we can actually help you answer.