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B12 helps form red blood cells, which are essential for delivering oxygen to muscles during physical activity

Examples of these health conditions include those with a lack of stomach acid, those who have undergone bariatric surgery, anemia caused by the inability to absorb the vitamin, other autoimmune digestive diseases, as well as several medications

Mice undergoing in vivo reprogramming were found to become depleted in B 12 and show signs of methionine starvation while supplementing reprogramming mice and cells with B 12 increased reprogramming efficiency, indicating a cell-intrinsic effect

Vitamin B 12 from foods appear to have different absorption rates with better absorption from chicken and beef as compared to eggs

If your levels are already normal, the science is weaker