Vegan B12

What Is Vitamin B12?

Vitamin B12 (cobalamin) is an essential vitamin required for nerve function, red blood cell formation, and DNA synthesis. It is found naturally in animal products — meat, fish, eggs, and dairy. It is not reliably found in any plant foods unless they are fortified. This makes B12 supplementation absolutely critical for anyone following a vegan diet.

This Is Non-Negotiable

Let us be completely clear: if you are vegan, you must supplement B12. This is not optional, not debatable, and not something you can get around by eating nutritional yeast or spirulina in sufficient quantities. B12 deficiency causes megaloblastic anaemia and, more seriously, irreversible neurological damage including peripheral neuropathy, memory loss, and cognitive decline.

Deficiency can take years to develop because the body stores B12 in the liver. This is dangerous because it creates a false sense of security — by the time symptoms appear, permanent nerve damage may have already occurred.

How It Works

B12 is essential for maintaining the myelin sheath that protects your nerves, for producing healthy red blood cells, and for converting homocysteine to methionine (high homocysteine is a cardiovascular risk factor). Without adequate B12, nerve signals slow, red blood cells become abnormally large and ineffective, and homocysteine accumulates.

What the Research Says

The evidence is unequivocal — B12 supplementation is safe, effective, and necessary for vegans. The Vegan Society, the British Dietetic Association, and every major nutritional body recommends B12 supplementation for people who do not consume animal products. Blood levels of B12 should ideally be above 500 pg/mL for optimal health (the “normal” range starts at 200, but symptoms can occur below 500).

Dosage and Forms

There are two common forms of supplemental B12:

• Cyanocobalamin — The cheapest and most studied form. Your body converts it to the active forms (methylcobalamin and adenosylcobalamin). Perfectly effective for most people.
• Methylcobalamin — An active form that may be better absorbed by some individuals. Slightly more expensive. A reasonable choice if you want to skip the conversion step.

Either works. The important thing is that you actually take it consistently. A daily dose of 1000mcg or twice-weekly dose of 2500mcg ensures adequate absorption regardless of form.

Who Should Take It

Every vegan, without exception. Vegetarians who eat limited dairy and eggs should also consider supplementing. Older adults (over 50) of any diet may benefit, as B12 absorption decreases with age. Anyone who has had gastric surgery or takes acid-reducing medications (PPIs) should discuss B12 status with their doctor.

Testing Your Levels

If you have been vegan for more than a year without supplementing, get your B12 levels checked. Ask for both serum B12 and methylmalonic acid (MMA) — MMA is a more sensitive marker of functional B12 status.

Vegan?

B12 supplements are vegan-friendly. Both cyanocobalamin and methylcobalamin are produced through bacterial fermentation — no animal products involved. This is one of the rare cases where supplementation is not just helpful but genuinely essential for a plant-based diet.

Where to Buy

• Amazon — Nutravita Vitamin B12 1000mcg — from £6.99
• Bulk Vitamin B12 Tablets — from £4.99
• Holland & Barrett Vitamin B12 — from £7.99

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