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Measuring 24-hour urinary magnesium excretion after an intravenous magnesium load may be used if kidney and GI function are normal
Intakes above this level can cause copper deficiency over time
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Unlike many nutrients, B12 is produced exclusively by bacteria and obtained primarily through animal-based foods including meat, fish, eggs, and dairy products
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
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