Fatigue is common and can be caused by many things, including: Iron deficiency Low vitamin D Thyroid issues Poor sleep quality or sleep apnoea Stress and burnout Low mood/anxiety Dietary patterns and hydration Long-term conditions Thats why we always recommend basing B12 treatment on clinical context, and ideally blood test results, rather than guessing
Hematocrit, reticulocyte count, vitamin B12, folate and iron levels should be obtained prior to treatment
For someone who is genuinely deficient, those risks are the more serious side of the equation
1,6 Once stable, maintenance therapy can be decreased to an injection once every month or every other month
A healthcare professional should administer your first shot so they can monitor your reaction and check for any adverse effects