Vitamin B12
Essential for Nerve Health in Diabetes
Vitamin B12 is a crucial nutrient that supports nerve health, red blood cell formation and DNA synthesis. For people living with diabetes, particularly those taking metformin for a prolonged period, monitoring Vitamin B12 levels is vital. This simple blood test helps detect deficiencies early and can prevent serious nerve-related complications such as diabetic neuropathy.
What Is Vitamin B12?
Also known as cobalamin, Vitamin B12 is a water-soluble vitamin naturally found in animal-based foods such as eggs, dairy, poultry, meat, and fish. It is absorbed in the stomach and stored in the liver. A deficiency can develop over time due to:
- Poor dietary intake
- Gastrointestinal absorption issues
- Medication-induced malabsorption (especially metformin)
Conversely, low BUN levels may signal malnutrition, liver dysfunction, or overhydration—all of which are relevant concerns in individuals with poorly controlled diabetes.
Symptoms of Vitamin B12 deficiency
- Numbness and tingling in hands and feet
- Muscle weakness or cramps
- Fatigue, dizziness, or memory problems
- Megaloblastic anaemia
- Aggravation of diabetic peripheral neuropathy
Since the symptoms of B12 deficiency overlap with diabetic neuropathy, regular testing is essential to distinguish between the two and initiate the right treatment.
Vitamin B12 Normal Range
| Test Result | Interpretatione |
|---|---|
| Below 200 pg/mL | Deficient |
| 200–300 pg/mL | Borderline or insufficient |
| 300–900 pg/mL | Normal |
When Should You Take a Vitamin B12 Test?
- If you have been on metformin for over two years
- If you experience numbness, fatigue, balance issues or memory loss
- As part of your annual diabetes complication screening
- If you follow a strict vegetarian or vegan diet
- If you are over the age of 50, when absorption tends to decline naturally
How to Maintain Healthy B12 Levels
- Include B12-rich foods like eggs, fish, dairy and fortified cereals
- Take oral supplements or B12 injections as prescribed
- Get tested annually if you are on long-term diabetes medications
- Address deficiency early to prevent irreversible nerve damage