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As you are technically absorbing lower amounts of B12 over time, it might take a while for symptoms to reduce

During a physical exam, your doctor will listen to your heart, check to see if your livers enlarged, and look for any signs of nerve damage

Some People Have Problems with Absorption Some health conditions such as Crohns Disease and Celiac Disease can prevent the proper absorption of vitamins and nutrients, even when its given in an injection

Now, Im not always about bashing the NHS, in fact Im one of the biggest supporters and always try to work constructively with doctors whether in primary or secondary care