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Case Presentation A 34-year-old male, recently using heroin and tobacco, visited an emergency department (ED) due to severe left leg pain, swelling, and tenderness (Figure 3)

The causes include bowel diseases, gastritis, certain medications, and decreased absorption in old age

Results vary based on baseline health, hormone status, sleep quality, stress levels, and dosing structure

However, serum B12 alone may not always reflect true tissue B12 status, particularly in liver disease where altered binding proteins can lead to misleadingly normal or elevated results

It means that it can be legally synthesized, sold, and purchased for in-vitro and laboratory research purposes only

How long did it take to return to normal