B12 is unusual among nutrients: it is made only by bacteria, and in food it is found almost entirely in animal products. A vegetarian diet — the everyday reality in most Indian homes — can be complete in protein, iron and calcium and still fall short on B12 alone.
Why it matters
- B12 is needed to make red blood cells and to keep nerves working properly
- In pregnancy, the baby's B12 store at birth depends entirely on the mother's own level
- Low B12 in children has been linked to slower growth and developmental delay in research
Who is most likely to be low
| Who | Why |
|---|---|
| Strict vegetarians who eat little or no dairy | Plant foods carry almost no reliable B12 |
| Vegans | No animal-based food at all in the diet |
| Pregnant and breastfeeding women on a vegetarian diet | The baby draws on the mother's store |
| Older adults | The body absorbs B12 less efficiently with age |
| Anyone on long-term medication for diabetes or acidity | Some common medicines reduce B12 absorption — ask the prescribing doctor if this applies |
A common mix-up
Fermented foods like idli and dosa batter, and most plant foods marketed as "B12-rich," do not reliably provide usable B12 — any trace amount in them varies too much to count on. The dependable sources are:
| Food | B12 |
|---|---|
| Milk, curd, paneer, cheese | Some B12 |
| Eggs | Moderate B12 |
| Fortified milk or breakfast cereal (check the label) | Added B12 |
A lacto-vegetarian diet with regular milk, curd and paneer usually gives some B12. A diet with little dairy and no eggs — common during some fasting periods, or in a vegan diet — gives almost none without a fortified food or a supplement.
Signs that may point to low B12
- Ongoing tiredness that does not lift with rest
- Pale skin or pale inner eyelids
- Tingling or numbness in the hands or feet
- Low mood, or trouble concentrating
Every one of these has other common causes too — tiredness alone does not mean low B12. A blood test is the only reliable way to know; don't try to diagnose it from symptoms alone.
What helps
- If dairy and eggs are part of the diet, eating them most days usually covers daily B12 needs
- If the diet has little dairy, look for a fortified food — fortified milk and some breakfast cereals list B12 on the label
- A vegetarian or vegan woman who is pregnant or breastfeeding should mention her diet to her doctor at an antenatal visit, so her B12 can be checked if needed
- Never start a B12 injection or a high-dose tablet on your own — whether a supplement is needed, and how much, is a doctor's call based on an actual blood test, not something to decide from a symptom list
When to see a doctor
- Tiredness that persists for weeks despite enough rest and food
- Tingling, numbness, or unsteadiness
- A vegan or near-vegan pregnancy
- A child who seems unusually pale, tires quickly, or is slow to reach growth milestones
This is nutrition guidance, not a diagnosis — a doctor's blood test is what actually confirms a B12 level, and only a doctor should decide on a supplement and its dose.