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Unlike oral B12 tablets, B12 injections are rapidly absorbed by the body immediately after administration and do not pass through the digestive system
For example, parameters that have been shown in other studies to alter cecal and fecal microbiomes (e.g., vendor source 62,63 ) were consistent across experimental groups in this study
Plasma levels drop from approximately 200ng/ml at age 20 to 80ng/ml by age 60
Severe deficiency causes irreversible neurological damage and subacute combined degeneration of the spinal cord, a condition that does not fully reverse even with aggressive B12 repletion
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