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Think of it as refilling a completely empty tankit takes a concentrated effort at first to get things running smoothly again
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
These findings were not attributed to variations in food intake, which implies that the observed results were mediated by alterations in metabolic processes [1]
These deficiencies affect the nervous system, weaken bones and muscles, and disrupt immunity
