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In rare cases, a long-standing B12 deficiency can affect the optic nerve, potentially causing blurred or double vision

Similarly, older adults, those with digestive disorders like Crohns disease or celiac disease, and individuals whove undergone weight-loss surgery may struggle with the bodys ability to absorb B12 from food

Since youre absorbing smaller amounts over time, it may take longer to notice improvements

Individuals seeking B12 injections solely for fat loss should first undergo proper assessment by their GP to exclude genuine deficiency and discuss evidence-based weight management strategies

In summary, vitamin B12 is an essential nutrient that helps create new red blood cells, maintain nerves, produce DNA, and enable cell division