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Surgical procedures involving the stomach or intestines, such as gastric bypass surgery, can lead to reduced B12 absorption due to alterations in the digestive tracts anatomy

Colchicine, para-aminosalicylic acid and heavy alcohol intake for longer than 2 weeks may produce malabsorption of vitamin B 12

Benzyl alcohol is an aromatic alcohol that works by disrupting the bacterial cell membrane

Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback