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Understanding the duration of these benefits can help individuals determine the right treatment plan for their health needs
With an oral supplement, the B12 needs to be absorbed through your digestive system first before getting to your blood, which takes a lot longer
Excess B12 from oral supplements is poorly absorbed at high doses (the body absorbs roughly 1 to 2% of a 1,000 mcg oral dose) and the remainder is excreted in urine
This test helps determine whether a person has normal levels of B12, is deficient, or has excessive levels due to supplementation or underlying conditions
[1] Whilst B12 supplementation is generally well-tolerated, some individuals report experiencing joint pain or aching after commencing treatment
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