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If the blood is visibly haemolysed (lots of burst blood cells) the lab will not do the B12 test for that reason

High doses of Vitamin C taken within 1 hour of the shot may lower B12 in blood (minor, stagger doses)

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It is best to follow a healthcare professionals guidance on whether they recommend vitamin B12 supplements based on individual circumstances.

Magnesium is an essential factor for vitamin D activation and metabolism