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People can also have 'normal' levels of B12 in their blood, but be symptomatic - this is known as a functional B12 deficiency
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The detection sensitivity reaches the nanogram level, making it suitable for quantifying trace active ingredients in capsules and related pharmacokinetic studies
With intramuscular injections of B12, any excess will result in high levels within your blood so you may experience side effects such as headache, dizziness, tiredness, or gastrointestinal issues including nausea, until your body has metabolised any excess through your kidneys enroute to excretion via urine
The right move is to raise it with your GP or a haematologist, who can review your schedule, rather than quietly adding private injections on top, which leaves no one with the full picture
Values below 170 to 250 pg/mL for adults indicate a deficiency
