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Because of this, their sourcing is easier to evaluate
The alleviation of symptoms that are treated through vitamin B12 injections including fatigue and lethargy can start to be noticed after a few days and will continue to improve for multiple weeks
The timeline will depend on safety data, final trial outcomes, and regulatory review
Taking both together makes sense for most people, though folate status should be adequate before starting high-dose b12 to avoid masking folate deficiency
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