
Vitamin B12 Deficiency: Symptoms, Risk Factors and What to Do
Vitamin B12 deficiency symptoms — tingling, fatigue, memory issues and more. Who's at risk in India and how to fix it. Prakash Hospital Noida.
30 Sept 2026
by Prakash Hospital

Discover why Vitamin B12 is critical for preventing nerve damage and anemia, learn how to identify deficiency symptoms, and explore top dietary solutions.
Vitamin B12 (Cobalamin) is a powerhouse nutrient that does two monumental jobs in your body: it manufactures your red blood cells and maintains the protective myelin sheath wrapped around your nerves. Think of B12 as the insulation around a live electrical wire; without it, your nerves begin to short-circuit. Because B12 is primarily found in animal tissues, deficiency is a massive, widespread issue in India due to high vegetarianism. When B12 drops too low, it causes a specific type of anemia (Megaloblastic Anemia) where your red blood cells become too large and clumsy to carry oxygen effectively. Long-term deficiency can lead to permanent, irreversible nerve damage, making early detection and dietary intervention critical.
The Indian Council of Medical Research (ICMR) recommends:
*Pregnant and lactating women require higher doses (up to 3.2 µg). Absorption rates drop significantly as you age.
Plants do not produce Vitamin B12. It is synthesized by bacteria. For strict vegetarians, dairy and fortified foods are the only natural dietary pathways.
| Rank | Food Item | Type | Estimated Amount (Per 100g) |
|---|---|---|---|
| 1 | Mutton/Chicken Liver | Non-Veg | ~ 50 - 80 µg (Extremely High) |
| 2 | Rohu/Catla Fish | Non-Veg | ~ 3 - 5 µg |
| 3 | Fortified Nutritional Yeast | Vegan | ~ 20 - 40 µg (Varies by brand) |
| 4 | Eggs | Non-Veg | ~ 1.1 µg (Mostly in yolk) |
| 5 | Chicken Breast | Non-Veg | ~ 0.3 - 0.5 µg |
| 6 | Milk (Cow/Buffalo) | Vegetarian/Dairy | ~ 0.4 - 0.5 µg |
| 7 | Curd (Dahi) | Vegetarian/Dairy | ~ 0.3 - 0.4 µg |
| 8 | Paneer | Vegetarian/Dairy | ~ 0.8 µg |
| 9 | Fortified Breakfast Cereals | Vegetarian | ~ 2 - 5 µg (Check labels) |
| 10 | Fortified Plant Milks (Soy/Almond) | Vegan | ~ 1 - 2 µg (Check labels) |
A strange tingling, numbness, or "electric shock" sensation in your hands and feet due to nerve demyelination.
Feeling constantly exhausted or dizzy because your body doesn't have enough healthy red blood cells to transport oxygen.
Difficulty concentrating, memory lapses, or mood changes (depression) linked to neurological stress.
Vitamin B12 is water-soluble, which means your body generally excretes what it doesn't need through urine. Toxicity is extremely rare.
Do not ignore tingling in your hands and feet. If left untreated for too long, Vitamin B12 neuropathy can become permanent. If you are a strict vegetarian, over the age of 60, or take heartburn medication (which blocks B12 absorption in the stomach), you are at high risk.
At Prakash Hospital, our Internal Medicine and Neurology departments can rapidly test your serum B12 levels. If your stomach lacks the "intrinsic factor" needed to absorb B12 from food, our doctors will prescribe direct intramuscular B12 injections to bypass your digestive system and heal your nerves.
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