how long do b12 injections take to work Does It For Work? Feeling worse after B12 Injection:

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The researchers proposed that the compounds effects on muscle function operate through boosting NAD+ levels by inhibiting NNMTs consumption of nicotinamide, more substrate is available for NAD+ synthesis via the salvage pathway, supporting mitochondrial function and energy metabolism in aged skeletal muscle

Thats why you may feel fatigued or dizzy when you have a deficiency

Poor circulation and a low red blood cell count are indicators of anemia, a serious condition where oxygen delivery to the bodys cells, especially peripheral cells in the feet and hands, is limited