Can a vegetarian diet give you enough vitamin B12?

Vegetarian B12 sources, fortified foods and supplements: what an Indian trial and British diet study tell us, and what a food journal cannot diagnose.

Prepared by PoshanSense · AI-assisted educational writing
Our sources and editorial approach · Not clinically reviewed

Complementary human studies · Published 2010

Dal, vegetables, roti and fruit can make a varied plate. But a varied plate and a dependable source of every nutrient are different questions. B12 is a particularly useful example: before buying another “energy” supplement, ask where the B12 in your usual week actually comes from.

Two studies, two different questions

The British study asked what blood B12 looked like across existing diets. Average concentrations were highest in omnivores and lowest in vegans. Some vegetarians also had low values. That is a reason to check the source, rather than assume that occasionally eating dairy settles the question.

It did not assign anyone to a diet, and its data are old. Differences between the groups cannot isolate diet from every other influence. The percentage below a study threshold also changes with the threshold used; it is not an individual diagnosis.

The Pune trial asked a different question: could providing B12 change blood markers? Both B12 groups increased blood B12 and reduced homocysteine versus the no-B12 comparison. That supports a biochemical response to a reliable supplied source. It does not show that the tested doses are treatment doses for everyone, or that lowering a marker prevented heart disease.

Why keep older research in the conversation?

A publication date helps place evidence in time; it does not tell you whether the experiment answers your question. Here, one paper describes a dietary gap and the other tests supplying the nutrient. We use them together for those distinct purposes, not to calculate a combined deficiency rate.

Bring it back to an Indian kitchen

Milk, yogurt and eggs contain B12, where they fit your diet. Unfortified plant foods are not dependable natural sources. A plant drink or cereal only counts as fortified if its label says so; similar-looking packs can differ. Fermented food should not be assumed to solve the gap. These food-source points come from the NIH fact sheet, rather than a new trial of Indian recipes.

A practical starting point is a short list: your actual B12 source, its labelled amount where available, and how often you use it. “I eat healthily” is less useful than that list. A journal can help reconstruct the routine; it cannot measure absorption or interpret a blood test.

When the question becomes personal

Persistent symptoms, a previous low result, absorption problems or medicines affecting B12 deserve a clinician’s assessment. Do not diagnose yourself from fatigue or copy a research dose. Food-source planning and treatment of established deficiency are different tasks.

Evidence context: the Pune trial was Wellcome Trust funded; the medicine was supplied free by NuLife. The UK paper reported public/research funding and one author’s Vegan Society membership. Neither study is a modern national survey.

Published 10 October 2026 · Sources checked 10 October 2026. Suggest a correction.