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Vitamin B12 deficiency can lead to fatigue, weakness, constipation, loss of appetite, weight loss and megaloblastic anemia (a situation where red blood cells are bigger than usual)

Everyone knows that blood is red

The term impaired sensitivity to B12 more aptly captures this condition than functional B12 deficiency, encompassing a broader portrayal of the potential underlying pathological physiological process involving decreased responsiveness to B12 treatment, including B12 absorption, transport, intracellular metabolism, and mitochondrial MMA metabolism

Unlike oral supplements, shots deliver the vitamin directly into the bloodstream, allowing for faster absorption

Here are the most common signs of B12 deficiency: Physical symptoms You feel tired and lack energy