Five best B12 supplements in the UK: Tablets, sprays and liquid options

Vitamin B12 is one of the few nutrients a modern UK diet can quietly run short on, particularly for vegans, vegetarians and older adults. 

Correcting that is simple in principle, though the supplement aisle makes it feel anything but.

Format matters far more than most shoppers expect. Tablets, sprays and liquids deliver B12 by different routes and at wildly different strengths, and the right pick usually comes down to how you plan to take it rather than which label shouts loudest.

Key takeaways

• B12 comes in several chemical forms, and methylcobalamin and adenosylcobalamin are the two the body uses directly without conversion.
• Sublingual liquids, sprays and dissolvable nuggets are all designed to be absorbed through the mouth rather than relying only on digestion.
• Strengths across this shortlist range from 50 mcg in a B complex tablet to 3,000 mcg in a high-strength liquid. 
• Pack size matters as much as the shelf price, so a 180-tablet tub at one a day covers roughly six months from a single purchase. 
• If you follow a plant-based diet, are over 50 or take medication that affects stomach acid, a daily B12 supplement is worth discussing with your GP or pharmacist.

How we chose these five

Every product below was checked against the manufacturer’s own UK product page rather than a marketplace listing, because third-party descriptions go stale and often misstate the active form. 

We recorded the B12 form, the strength per serving, the delivery method, and the pack size, then grouped the results so each entry answers a different buying need.

We also picked one option per format rather than five near-identical tablets. Anyone comparing B12 supplements is really comparing delivery methods.

The five best B12 supplements in the UK

1. Nature Provides: Bioactive B12 (3000 mcg) Liquid Coenzyme Vitamin B12, best Bioactive liquid B12

This is the shortlist’s purist option. The formula uses only the two premium coenzyme forms of vitamin B12, methylcobalamin and adenosylcobalamin, held in reverse osmosis with nothing else added.

Each 1 ml serving delivers 3,000 mcg of B12, and a 50 ml bottle gives 50 servings. The suggested use is 1 ml daily, roughly 13 drops, taken under the tongue and held in the mouth for 30 seconds before swallowing so the vitamin can be absorbed through the oral mucosa rather than relying solely on standard digestive absorption.

There are no artificial preservatives, colourings or flavourings. Nature Provides avoids preservatives entirely by supplying the Bioactive B12 liquid in Miron violet glass, which filters light to protect the contents without the need for added preservatives.

It is made in the UK, and the brand links it to immune function, energy-yielding metabolism, psychological function and the reduction of tiredness and fatigue.

If you want a needle-free, high-strength B12 with the shortest possible ingredients list, this is the one to look at first.

2. Solgar Methylcobalamin (Vitamin B12) 1000 mcg nuggets, best B12 chewable

Solgar’s nuggets contain 1,000 mcg of methylcobalamin, the active coenzyme form, in a small tablet designed to dissolve under the tongue. 

They carry a natural cherry flavour and can be chewed or tucked between the gum and cheek, which suits anyone who dislikes droppers and sprays.

The recommended dose is one nugget daily, preferably with a meal. They are suitable for vegans and free from sugar, salt and starch, and the sublingual route means the B12 is absorbed without depending solely on the digestive tract.

Solgar lists a 30-nugget pack on its UK site, so that tub covers a month at one a day. It is the pick if you want an active B12 in something closer to a sweet than a supplement.

3. BetterYou Vitamin B12 oral spray, best B12 oral spray

BetterYou delivers 1,200 mcg of methylcobalamin across a four-spray daily dose, aimed at the inside of the cheek rather than being swallowed. 

The formula also includes 40 mcg of chromium and carries a natural, sugar-free apricot flavour.

The brand has developed its oral spray technology alongside Cardiff University, and its case rests on absorption through the buccal membrane rather than the gut. 

BetterYou lists it as a two-month supply, and the dose can be split across the day rather than taken all at once.

It is free from sugar, artificial colours and flavourings, fillers and gluten, and BetterYou lists it as suitable from age three, during pregnancy and for vegans. For travel or a busy morning routine, a spray is the least fussy format on this list.

4. Vitabiotics: Ultra Vitamin B Complex, best B12 with additional nutrients

Not everyone needs an isolated megadose of B12. Vitabiotics Ultra Vitamin B Complex provides all eight essential B vitamins in a tablet taken once or twice daily.

Alongside B12, the tablet contains thiamin, riboflavin, niacin, pantothenic acid, vitamin B6, biotin and folic acid, which Vitabiotics produces under GMP quality control.

That combination suits people who want broad B vitamin cover rather than a single nutrient at high strength.

The wider B group supports normal nervous system function and normal energy-yielding metabolism, and B12 specifically contributes to the reduction of tiredness and fatigue. 

It is a sensible starting point if a blood test has not flagged a specific B12 problem.

5. Holland & Barrett : Max strength slow release vitamin B12 1000ug, best value B12

Holland & Barrett’s own label tablet supplies 1,000 mcg of vitamin B12 as cyanocobalamin in a slow-release format, sold in 120 and 180 tablet tubs. At one tablet a day, the larger tub covers roughly six months from a single purchase.

Slow release means the B12 is released gradually rather than all at once, which some people prefer for a steady daily top-up. 

The ingredients list is short, and the tablet is swallowed rather than dissolved, so it is the most conventional option here.

This is the pick for anyone who wants a no-fuss daily habit in the largest pack size on this list. 

Quick comparison

How to choose the right B12 format

Start with how you absorb rather than how much you take. If you have digestive issues, take medication that reduces stomach acid, or simply want to skip the gut, a sublingual liquid, spray, or dissolvable nugget gives the B12 a route through the lining of the mouth.

Then look at the form on the label. Methylcobalamin and adenosylcobalamin are the coenzyme forms the body uses directly, while cyanocobalamin has to be converted first.

Finally, weigh strength against your reason for supplementing. A maintenance dose inside a B complex is a different job from a high-strength daily liquid, and neither replaces a blood test.

Conclusion

There is no single best B12 supplement in the UK, only a best fit for how you live and how you absorb. 

A high-strength sublingual liquid with both coenzyme forms is the most complete option, a spray or chewable wins on convenience, and a slow-release tablet is hard to beat on cost per day.

Whichever you choose, consistency matters more than the number on the front of the bottle. If you are unsure where your levels sit, ask your GP for a test before committing to a high strength product.

FAQs

How much vitamin B12 do I actually need each day?

Baseline requirements are measured in single-figure micrograms for most adults, which is why even a modest B complex covers general maintenance. Higher strength products are typically used by people with restricted diets or absorption problems, and a blood test is the only reliable way to know which group you fall into.

Is liquid B12 better absorbed than tablets?

Sublingual liquids and sprays are designed to be absorbed through the lining of the mouth, avoiding reliance on digestion. 

Standard swallowed tablets depend on the stomach and gut, so the mouth-absorbed formats tend to suit anyone with digestive or acid-related issues.

What is the difference between methylcobalamin and cyanocobalamin?

Methylcobalamin is an active coenzyme form the body can use directly, while cyanocobalamin must be converted to become metabolically active. 

Adenosylcobalamin is the other active coenzyme form, and a small number of products include both.

Do vegans and vegetarians need a B12 supplement?

Vitamin B12 occurs naturally in animal foods such as meat, fish, and dairy, so plant-based diets rely on fortified foods or supplements. Anyone avoiding both fortified products and animal foods is at meaningful risk of running low.

Can you take too much vitamin B12?

Vitamin B12 is water-soluble, so the body generally passes what it does not use. Even so, you should not exceed the stated intake on the label, and it is worth checking with a pharmacist or GP if you take other supplements or prescription medication.