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Vitamin B12 deficiency is consistently underdiagnosed, and the neurological consequences of prolonged insufficiency can be significant. We recommend this particular product because methylcobalamin is the form our clinicians prefer — it skips the conversion step required by cheaper alternatives. The liquid format adds a practical advantage for patients who absorb poorly or dislike capsules. Pure Encapsulations' reputation for minimal, well-characterised formulations means what is on the label is what you get.
About this product
B12 Liquid
Pure Encapsulations B12 Liquid delivers methylcobalamin — the active, neurologically relevant form of vitamin B12 — in a liquid format designed for efficient absorption. Unlike cyanocobalamin, which the body must convert before use, methylcobalamin is ready for immediate uptake and is the form most studied for neurological and metabolic support.
B12 is essential for red blood cell formation, DNA synthesis, and the maintenance of myelin, the protective sheath around nerve fibres. Inadequate levels are more common than many assume: people following plant-based diets, older adults with declining stomach acid, and those with gastrointestinal conditions that impair intrinsic factor production are all at meaningful risk of insufficiency. Fatigue, low mood, and cognitive fog can all be early signs of suboptimal status — though these are non-specific and a blood test is the right way to confirm.
The liquid format is particularly practical for those who struggle with tablets or capsules, and may suit individuals with absorption challenges that affect solid-form supplements. It is also easy to adjust intake once a clinician has reviewed your levels.
Pure Encapsulations is a brand with a long-standing reputation in functional medicine for clean, well-specified formulations. This product is a straightforward, single-ingredient B12 — no unnecessary fillers, no guesswork about form or bioavailability.
What it does
Benefits
- 01
Supports energy metabolism in those with low B12 status
- 02
Methylcobalamin form: active and readily bioavailable
- 03
Assists maintenance of healthy nerve function
- 04
Liquid format suits those with swallowing difficulties
- 05
Practical for people at higher risk of B12 deficiency
Get the most from it
How to use
Take 1 ml daily, as directed on the packaging or by your healthcare practitioner. Liquid B12 is typically held briefly under the tongue before swallowing to support absorption, though follow any specific instructions provided with the product.
What's inside
Ingredients
View full ingredient list
Methylcobalamin (B12)
Common questions
Frequently asked
Why choose methylcobalamin over cyanocobalamin?
Methylcobalamin is the biologically active form of B12, meaning the body can use it directly without needing to convert it first. Cyanocobalamin is cheaper and widely used, but requires an additional metabolic step. For most people the difference is modest, but those with certain genetic variants (affecting the MTHFR pathway) or compromised liver function may benefit more from the active form.
How do I know if I actually need a B12 supplement?
A standard blood test measuring serum B12 — and ideally active B12 (holotranscobalamin) — is the most reliable way to assess your status. We'd recommend testing before supplementing rather than guessing, particularly as symptoms like fatigue and brain fog have many other causes.
Who is most at risk of B12 deficiency?
People following vegan or vegetarian diets, older adults (stomach acid declines with age, impairing B12 absorption), those taking long-term metformin or proton pump inhibitors, and people with conditions affecting the gut — such as coeliac disease or Crohn's — all carry higher risk.
Is this safe to take alongside other B vitamins or a multivitamin?
Generally yes, but check the B12 content of any other supplements you are already taking to avoid unnecessary duplication. If you are under clinical care for a specific deficiency, follow your practitioner's guidance on dosing.
How long before I notice a difference?
This varies considerably. People with established deficiency may notice improvements in energy or mood within a few weeks, but neurological symptoms can take longer to resolve. If you are supplementing to maintain adequate levels rather than correct a deficiency, the effects are preventive and unlikely to be felt acutely.
Doctor-guided care
Test before you supplement.
Bloods are the only way to know what your body actually needs. We'll tell you which of these supplements earn their place.
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