This is one of the earliest signs that the injection is helping your body produce more red blood cells and improving oxygen transport
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Medical History Consult with your doctor before using vitamin B12 supplements if you have or have had iron deficiency anemia, potassium deficiency (hypokalemia), or folic acid deficiency
Vitamin B12 supplements can help treat or prevent a vitamin B12 deficiency, which can be serious and Not everyone needs to take a vitamin B12 supplement, as However, healthcare professionals may recommend vitamin B12 supplements for certain populations, including: people following a vegan diet older adults people who have had gastrointestinal surgery people who have nutrient absorption issues people with dietary restrictions People taking certain long-term medications, such as metformin and proton pump inhibitors, may also benefit from a supplement, as these medications can affect absorption of vitamin B12
doi:10.1038/sj.ijo.0801740 Mor MI, Kenley D