Vitamin B12

Common Symptoms of Deficiency

Deficiency often develops slowly, and symptoms may be mistaken for other conditions[

Physical: Extreme fatigue, weakness, pale skin, and shortness of breath.

• Neurological: Numbness or a "pins and needles" sensation in hands and feet, and balance problems.

• Mental: Memory issues, irritability, depression, or confusion.

• Oral: A sore, red, or abnormally smooth tongue (glossitis) and mouth ulcers.

Best Food Sources

B12 is primarily found in animal-based products. Plant-based sources are typically only available if the food is fortified.

Source Type Top FoodsAnimal ProteinsBeef liver, clams, sardines, salmon, and eggs.DairyMilk, Greek yoghurt, and cheddar cheese.Vegan/VegetarianFortified breakfast cereals, nutritional yeast, and fortified plant milks.

Treatment: Injections vs. Oral Pills

The right treatment depends on the severity of the deficiency and how well your body absorbs the vitamin.

• Injections (Shots): These bypass the digestive system, making them ideal for people with severe deficiency or gut absorption issues (like Crohn's disease or post-gastric surgery).

• Oral Supplements: High-dose daily tablets (1000–2000 mcg) are often effective for mild to moderate cases and are more convenient for home use.

• Sublinguals: Tablets placed under the tongue can sometimes offer faster absorption into the bloodstream.

🩺 Understanding Your Lab Results

A blood test is the only way to confirm a deficiency. Most Indian laboratories follow these standard ranges:

• Normal: 200 – 900 pg/mL (Optimal is often considered 400 – 600 pg/mL).

• Borderline: 200 – 300 pg/mL.

• Deficient: Below 200 pg/mL.