does alcohol affect b12 injections Can lead to deficiency? Here's what you need to know How Long Does It Take

So, inject daily for three months, and only then gauge how you feel

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Do not stop taking the medication even if your symptoms improve

These include: Vegetarians and vegans, as vitamin B12 is mainly found in animal products Older adults, as they absorb vitamin B12 less well with age People with gastrointestinal disorders, like celiac disease or Crohns disease, which can block vitamin B12 absorption Those taking certain medications, such as proton pump inhibitors or metformin, which can also block vitamin B12 absorption Its best to talk to a healthcare professional about whether you need vitamin B12 supplements

Studies have shown that at doses high enough to fully saturate intestinal B12 receptors, oral B12 is effective, despite a lack of intrinsic factor

For these, you can use both the natural and synthetic forms of vitamin B12