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A few plant-source foods, such as certain fermented beans and vegetables and edible algae and mushrooms, may contain bioactive vitamin B 12 (125)

PMCID: PMC6581107

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

While B12 injections cant cure depression on their own, they have been known to relieve or reduce some of the symptoms and can also be used to reduce the risk of severe cases of depression

Employ sterile tools for each withdrawal, reseal immediately after access, and record lot numbers and preparation steps for traceability