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For those with Vitamin B12 deficiency, injections are an effective means of rapidly increasing blood oxygen levels, often in a noticeable boost in energy

If your levels are in the intermediate range, your doctor may also test your levels of MMA and homocysteine

If you don't have a deficiency, you probably won't notice any benefits from a B12 shot, especially since any excess is simply excreted through urine

Vitamin B12 helps support neurotransmitters, like serotonin and dopamine, which play a role in regulating your mood and alleviating stress

[1] Similar titration schedules are recommended for other GLP-1 agonists to help improve tolerability and adherence

Metformin: Commonly prescribed for diabetes, metformin can affect the absorption of B12 in the gut over time