Best Vitamin B12 UK 2026 — Expert Picks
B12 is essential for energy, red blood cell formation, and neurological function. If you are vegan, over 50, or on certain medications like metformin, your levels are probably lower than they should be. These are the supplements I rely on.
Methylcobalamin B12 1000mcg
Nutravita — Active methylated form for superior absorption
Pros
- Methylcobalamin is the bioactive form
- 1000mcg per tablet
- 365 tablets for a full year
Cons
- Some people need the higher 5000mcg dose
- Tablets rather than sublingual
B12 Oral Spray 1200mcg
BetterYou — Sublingual spray for direct absorption
Pros
- Bypasses the gut for better absorption
- Natural apricot flavour
- Perfect for those with digestive issues
Cons
- Runs out faster than tablets
- Slightly pricier per dose
Vitamin B12 5000mcg Sublingual
Jarrow Formulas — High-dose sublingual lozenge
Pros
- 5000mcg for correcting deficiency fast
- Dissolves under tongue for direct absorption
- Cherry flavour tastes great
Cons
- Too high for maintenance dosing
- Not widely stocked in UK
Vitamin B Complex
Thorne — All 8 B vitamins in active forms
Pros
- Methylcobalamin and methylfolate included
- Full B complex for energy
- Clean label no fillers
Cons
- Lower B12 per capsule if B12 is your focus
- Premium price
Cyanocobalamin B12 1000mcg
Holland & Barrett — Budget-friendly high street option
Pros
- Cheap and widely available
- 1000mcg standard dose
- Easy to find in-store
Cons
- Cyanocobalamin needs converting to active form
- Less bioavailable than methylcobalamin
Buying Guide: What to Look For
Always choose methylcobalamin or hydroxocobalamin over cyanocobalamin — they are already in the active form your body can use. Sublingual forms (sprays, lozenges) bypass the gut and are better for people with absorption issues. If you are vegan, B12 supplementation is non-negotiable as there are no reliable plant sources.
Frequently Asked Questions
How do I know if I am B12 deficient?
Symptoms include fatigue, brain fog, tingling in hands and feet, mood changes, and pale skin. A blood test measuring serum B12 and methylmalonic acid (MMA) gives the clearest picture.
Can I take too much B12?
B12 is water-soluble, so excess is excreted in urine. There is no established upper limit, and toxicity is extremely rare even at high doses.
Is methylcobalamin better than cyanocobalamin?
Yes, for most people. Methylcobalamin is the naturally occurring active form and does not need conversion. Cyanocobalamin is synthetic and requires the body to convert it, which some people do inefficiently.
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