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There are two ways to measure the B12 supply: directly measure B12 in the blood measure certain decomposition substances in the urine, which accumulate in the instance of deficiency According to both routes there are different methods
Likewise, using insulin while your blood sugar is too low is also problematic because your blood sugar will just continue to drop
If you have several of those symptoms, please see your GP for a blood test
Without enough intrinsic factor, vitamin B12 cannot be properly absorbed, leading to deficiency
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