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The amount of vitamins that become available in your body depends on the source and the capacity of the intrinsic factor central to their absorption
Other than that, low vitamin B12 levels are more common in those who are: Older than 65 years of age
The timing, severity, and accompanying symptoms can provide valuable clues about whether the supplement is genuinely responsible or whether another cause should be investigated
However, keeping track of your symptoms can help you and your healthcare provider determine whether your response requires further investigation
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