b12 injections not raising levels What You Need to Know About Vitamin Vitamin B12 Deficiency: Causes, Symptoms,

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The key is to choose a clinic that takes your health seriously and offers more than just a shot

(More information) The long-term use of certain medications, such as inhibitors of stomach acid secretion and the anti-diabetes drug, metformin, can adversely affect vitamin B 12 absorption

This can last for 1-2 weeks and settles once the vitamin B12 supplements have been stopped

The effects of a single B12 injection typically last one to two weeks, though this varies depending on your baseline levels, metabolism, and overall health