do b12 injections cause diarrhea How Fast Does Injection Work How soon you feel less tired after a B12 shot? Vitamin B deficiencies can affect

Patients taking certain medications (e.g., chloramphenicol may reduce the effectiveness of B12 therapy) or with risk factors for B12 deficiency (metformin use, proton pump inhibitors, nitrous oxide exposure, vegan diet) should discuss these with their healthcare provider

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People with low B12 levels often report irritability, poor concentration, or low mood, all of which can make weight management harder

However, for most people we recommend the stomach area around the belly button, because it tends to have the most fat

Elderly patients may require adjusted dosing due to decreased absorption efficiency