Vitamin B12 Deficiency: The Hidden Cause of Fatigue and Tingling Hands

Vitamin B12 is essential for making red blood cells, maintaining nerves and producing energy. Yet studies suggest up to half of Indians may be deficient — largely because B12 comes mainly from animal foods.

Who Is at Risk?

• Vegetarians and vegans — plant foods contain almost no B12
• People over 50 — stomach acid needed for absorption declines with age
• Diabetics on metformin — the medicine reduces B12 absorption over time
• People taking acidity medicines (PPIs) long-term
• Anyone with gut issues like IBS or coeliac disease

Symptoms Develop Slowly

B12 deficiency creeps up over months to years:

• Fatigue and weakness that doesn't improve with rest
• Tingling or numbness in hands and feet ("pins and needles")
• Pale or yellowish skin
• Mouth ulcers and a sore, red tongue
• Memory problems and difficulty concentrating
• Low mood or irritability
• Breathlessness on mild exertion

The nerve symptoms are the most important — left untreated, nerve damage can become permanent.

Testing and Treatment

A simple Vitamin B12 blood test (no fasting needed) tells you where you stand. Levels below 200 pg/mL indicate deficiency; 200–300 pg/mL is borderline.

Treatment is straightforward — oral supplements or injections for severe cases — and most symptoms reverse within weeks to months if caught early.

The Smart Approach

Because B12 and Vitamin D deficiencies often coexist and share symptoms, testing them together makes sense. Yourlab's Vitamin Profile (₹1400) covers both, and our Advanced Full Body Checkup includes them along with iron studies.

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