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At comparable oral doses almost identical B12 concentrations were initially detected in the blood serum
If these intermediate metabolites are not quickly processed, they can cause massive cellular damage within the liver itself
M.FangJ.ZhuL.DingK
Why would anyone need Vitamin B12, or want to give themselves B12 shots
Because your body can store B12 for 2 to 5 years, a serious B12 deficiency is rare
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