b12 injection feeling tired Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy Chronic Fatigue: Can B12 Shots
Description
If you have a mild deficiency, it might take two to three shots spread out over a few days or weeks before you start feeling better

Many people suffer symptoms like fatigue, brain fog, and sluggishness without realizing a B-12 deficiency could be the cause
Some reasons people choose not to are because they have a fear of needles, they have had success with oral supplements, and that they just dont absolutely need vitamin shots
No significant long-term risks have been identified in published research