If you've stood in front of a shelf of B12 supplements wondering whether the spray is actually worth it or just cleverly packaged, you are in very good company. It's one of the questions we get asked most.

The short answer is yes, there are real reasons a spray works better for a lot of people. But it only makes sense once you understand how your body absorbs B12, which is genuinely more complicated than most vitamins.

Vitamin B12 is poorly absorbed by the stomach. This means tablets are usually ineffective at raising blood levels.

However, it's readily absorbed by the blood vessels under your tongue! So our under the tongue spray is ideal for optimal absorption

So, let's make it simple.

What Does Vitamin B12 Do?

Before we get into formats, here's why B12 earns its place in the first place.

Vitamin B12 contributes to:

• The reduction of tiredness and fatigue. The one most people notice first.
• Normal function of the immune system.
• Normal psychological function. Think mood, focus and mental clarity.
• Normal red blood cell formation. Essential for carrying oxygen around your body.
• Normal function of the nervous system.

It's one of those vitamins you never think about when your levels are fine and really feel when they're not.

Why Vitamin B12 Absorption Is Complicated

Here's where it gets interesting, and where the spray versus tablet question actually matters.

Most vitamins are absorbed fairly simply through your gut. B12 is fussier.

To absorb B12 from food or a standard tablet, your body needs a protein made in your stomach called intrinsic factor.

It grabs hold of the B12 and carries it along to be absorbed. Without enough of it, you could be eating all the right things or taking a tablet religiously and still not absorb what you need.

A few things can get in the way of that process:

• Age. Your production of intrinsic factor naturally slows as you get older.
• Digestive conditions. Including coeliac disease and other gut conditions.
• Certain medications. Particularly some reflux medications and metformin.
• Lower stomach acid, which is needed to release B12 from your food in the first place.

This is exactly why low B12 is far more common than people realise, and why the format of your supplement genuinely matters.

How Is B12 Spray Absorbed?

A sublingual B12 spray goes straight into your mouth and is absorbed through the soft tissue under your tongue and inside your cheeks.

That's the whole difference. Because it's absorbed there, sublingual B12 skips the digestive system entirely. It doesn't need intrinsic factor, stomach acid or a perfectly behaved gut to do its job.

For anyone dealing with the absorption hurdles above, that's a meaningful advantage. And for everyone else, it's simply one less thing to worry about.

The research supports it too. A 2025 systematic review and meta-analysis in Frontiers in Pharmacology, covering 16 studies and over 6,000 participants, found that sublingual B12 raised blood B12 levels comparably to injections.

Vitamin B12 Spray vs Tablets: The Key Differences

How they're absorbed. A spray goes through the soft tissue of your mouth and straight into your bloodstream. A tablet has to travel through your gut and relies on intrinsic factor to get there.

How quickly. A spray is faster, with nothing to dissolve or digest first. A tablet has to break down and be processed.

Whether gut health matters. For a spray, not at all. For a tablet, very much so.

Ease of use. One spray a day, no water needed, no tablet to swallow. Handy if you're one of those people who finds tablets a chore.

Who it suits. A spray suits most people, and particularly anyone with absorption concerns. A tablet is fine for healthy adults with no gut issues.

 

 

What Are the Signs of B12 Deficiency?

Low B12 creeps up slowly, which is a big part of why it gets missed. The signs come on gradually over months, and because they could point to plenty of other things, they often get put down to stress, a busy life or bad sleep.

Things people commonly notice:

• Feeling tired even after a decent night's sleep
• Brain fog, or losing your train of thought more than usual
• Low mood or feeling more irritable
• Tingling or numbness in hands or feet
• Looking paler than normal
• Mouth ulcers or a sore tongue
• Palpitations or feeling breathless

If a few of those feel familiar and you've been quietly explaining them away, this is your nudge to ask your GP for a blood test.

It's simple, it's quick, and it's the only way to know where you actually stand.

Low B12 is very fixable, but it's worth catching properly rather than guessing.

 

What Is the Best Form of B12 Supplement?

Our Vitamin B12 Sublingual Spray is designed to be absorbed quickly and easily through the soft tissue of your mouth - a practical, no-fuss addition to your morning, and one of the easiest habits going.

 

Can You Take B12 With Other Supplements?

Absolutely. B12 slots easily into a wider routine and pairs especially well with:

• Vitamin D. Another one most of us in Ireland run low on, particularly through the darker months.
• Magnesium. Supports energy, the nervous system and sleep.
• Folic acid. B12 and folate work closely together, and both matter if you're pregnant or trying to conceive.

 

So, Is B12 Spray Better Than Tablets?

For most people, yes. Especially if you eat less meat, have any digestive concerns, take certain medications or are over 50.

A sublingual spray sidesteps the absorption bottlenecks that make standard tablets unreliable for a good chunk of the population.

It's faster, easier, and there's no water or swallowing involved. The research backs it up.

If you're a healthy adult with no absorption issues, a good tablet will do the job perfectly well. But so many of us have one of those factors without ever knowing it, and the spray takes the guesswork out.

Our Vitamin B12 Sublingual Spray is €15.95. Doctor-formulated, made in Ireland, Guaranteed Irish approved and gluten-free.

If you're after a vitamin B12 spray Ireland can trust, that's the one.

Frequently Asked Questions

Is B12 spray better than tablets?

For many people, yes. A B12 sublingual spray is absorbed through the soft tissue of your mouth, bypassing the gut completely. That makes it especially useful if you have digestive issues, low stomach acid or any absorption difficulties, where a standard tablet may not be absorbed as well.

How is B12 spray absorbed?

Straight through the soft tissue under your tongue and inside your cheeks, and into your bloodstream from there. No digestion required, which is why it works regardless of what your gut is doing.

How do you use a B12 spray?

Spray it directly into your mouth, under your tongue or against your inner cheek, once a day. No water, no fuss.

What are the signs of B12 deficiency?

Persistent tiredness, brain fog, low mood, tingling in hands or feet, pale skin, mouth ulcers and palpitations are the most common. They come on slowly and are often blamed on stress or poor sleep. A blood test from your GP will confirm your levels.

Who needs a B12 supplement?

Vegans and vegetarians, anyone over 50, people with digestive conditions, anyone on reflux medication or metformin, and women who are pregnant or breastfeeding. If you're tired and foggy with no clear reason, it's worth checking.

Is it safe to take B12 every day?

Yes. B12 is water-soluble, so your body uses what it needs and passes the rest. There's no established upper limit, and no known risk from daily use at standard doses.

 

Always check with your GP before starting any new supplement, especially if you're pregnant, breastfeeding, or taking medication. If you think your B12 may be low, ask your GP to check your levels with a blood test.