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We recommend Thorne's methylcobalamin over standard cyanocobalamin supplements because the active form bypasses a conversion step that not everyone handles efficiently. Thorne is a brand our doctors use in clinical practice and trust for consistency. For patients with confirmed low B12, those on plant-based diets, or anyone on long-term metformin or acid-suppressing medication, this is a straightforward, well-formulated choice.
About this product
Vitamin B12
Thorne Vitamin B12 provides methylcobalamin, the active, co-enzyme form of B12 that the body can use directly without conversion. This matters because a meaningful portion of people have reduced capacity to convert the more common cyanocobalamin form, particularly those with MTHFR gene variants or compromised digestive function.
B12 plays a central role in red blood cell formation, DNA synthesis, and the maintenance of myelin — the protective sheath around nerve fibres. Deficiency is associated with fatigue, poor concentration, tingling in the extremities, and low mood. It is especially common in people following plant-based diets, older adults (who absorb B12 less efficiently through the gut), and those who take long-term metformin or proton pump inhibitors.
This supplement suits anyone with confirmed low B12 on a blood test, or those in higher-risk groups who want a well-absorbed maintenance dose. The capsule format means it is straightforward to incorporate into a morning routine.
Thorne is a brand our clinicians regard as reliable for manufacturing standards and ingredient quality, and their choice of methylcobalamin over cheaper synthetic forms reflects a formulation philosophy we look for. For anyone uncertain whether B12 is genuinely relevant to them, a simple blood test is the most direct way to find out before supplementing.
What it does
Benefits
- 01
Active methylcobalamin form, no conversion needed
- 02
Supports red blood cell formation and reduces fatigue
- 03
Helps maintain healthy nerve function and myelin
- 04
Well-suited to plant-based diets and B12 deficiency risk
- 05
May support cognitive clarity and mood stability
Get the most from it
How to use
Take 1 capsule daily, ideally in the morning with or without food. Follow the dosage guidance on the packaging, and consult your clinician if you are taking it to address a confirmed deficiency.
What's inside
Ingredients
View full ingredient list
Methylcobalamin 1000mcg
Common questions
Frequently asked
Why methylcobalamin rather than cyanocobalamin?
Methylcobalamin is the active co-enzyme form of B12, meaning the body can use it directly. Cyanocobalamin, the form in many cheaper supplements, must first be converted — a step that is less efficient in people with certain genetic variants (such as MTHFR) or poor digestive absorption.
Who is most likely to be B12 deficient?
People following vegan or vegetarian diets, older adults, those with atrophic gastritis or coeliac disease, and long-term users of metformin or proton pump inhibitors are at higher risk. A blood test is the most reliable way to confirm whether supplementation is warranted.
How long before I notice a difference?
This depends on your baseline levels and the reason for supplementing. People correcting a genuine deficiency may notice improvements in energy and concentration within several weeks, though full repletion can take longer. If symptoms persist, revisit with your GP or clinician.
Is it safe to take alongside other B vitamins or a multivitamin?
Generally yes, though it is worth checking whether your multivitamin already contains B12 to avoid unnecessary doubling up. If you are taking other supplements or medications, particularly methotrexate, check with your prescriber.
Can I take this on an empty stomach?
B12 is water-soluble and is generally well tolerated with or without food. Taking it in the morning, with or without a meal, is the most common approach and fits naturally into a daily routine.
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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