Vitamin B12 Deficiency: Fatigue, Neuropathy & Blood Test

Vitamin B12 (cobalamin) is a water-soluble vitamin essential for the normal functioning of the brain and nervous system, the formation of red blood cells, and DNA synthesis. Unlike other vitamins, B12 is synthesized exclusively by microorganisms and is found almost entirely in animal-derived foods. Consequently, vegetarians and vegans are at a exceptionally high risk of B12 deficiency.

Symptoms of B12 Deficiency

Deficiency symptoms develop gradually and can lead to permanent neurological damage if left untreated. Keep an eye out for these warning signs:

• Tingling or Numbness: A 'pins and needles' sensation in the hands and feet (peripheral neuropathy).
• Extreme Fatigue & Anemia: Difficulty producing healthy red blood cells, leading to megaloblastic anemia and low energy.
• Brain Fog & Memory Loss: Cognitive difficulties, confusion, and trouble concentrating.
• Mouth Ulcers & Swollen Tongue: A smooth, red, and painful tongue (glossitis).
• Balance Problems: Difficulty walking or maintaining coordination.

Why Vegetarians Struggle to Get B12

Plants do not require Vitamin B12, so they do not produce or store it. Vegetarian sources are limited to dairy products (milk, yogurt, paneer) and fortified cereals. However, the amount of B12 in these foods is often insufficient to meet the recommended daily intake, especially if absorption is compromised due to age or digestive health.

Testing and Treatment

A simple serum Vitamin B12 blood test measures the concentration of the vitamin in your blood. Normal levels range between 200 and 900 pg/mL, though many experts believe levels below 350 pg/mL can still cause neurological symptoms.

Treatment options include oral B12 supplements (methylcobalamin) or intramuscular injections for severe cases where absorption in the gut is impaired.