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Thorne Vitamin B12

Thorne

Vitamin B12

£15.00

Thorne Vitamin B12 provides methylcobalamin, the active, co-enzyme form of B12 that the body can use directly without conversion.

  • Active methylcobalamin form, no conversion needed
  • Supports red blood cell formation and reduces fatigue
  • Helps maintain healthy nerve function and myelin
  • Well-suited to plant-based diets and B12 deficiency risk
  • May support cognitive clarity and mood stability
4.8(34 reflections)
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about this product.

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.

Methylcobalamin 1000mcg

how to take it

i.

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.

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.

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Customer reflections

Overall sentiment

4.834 reflections
1 – 6 of 34 reflections
QQVerified Buyer

The first adrenal support that made a quick difference.

4 days ago

Gentle on a sensitive stomach, and I feel like myself again. I had tried two other glandulars before this and neither sat right.

MRVerified Buyer

Steadier mornings within a fortnight.

1 week ago

I was sceptical about glandulars, but my mid-afternoon crash has genuinely eased. One capsule with breakfast and I forget about it.

ALVerified Buyer

Subtle, but real.

2 weeks ago

Not a stimulant, which is exactly what I wanted. It took about ten days, then I realised I wasn’t dreading the afternoon any more.

SKVerified Buyer

My clinician recommended it.

3 weeks ago

Bought after a blood panel flagged a flat cortisol curve. Easy to take, no jitters, and the sourcing is refreshingly transparent.

TPVerified Buyer

Recovery feels faster.

1 month ago

Training hard through a stressful stretch and this has helped me bounce back between sessions. Already on my second bottle.

DVVerified Buyer

Does what it says.

1 month ago

No frills, one ingredient, a sensible dose. I appreciate that it is designed to be used for a season rather than forever.

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