How long does it take to rid body of too much vit b12?

The body typically eliminates excess vitamin B12 relatively quickly, as it's water-soluble and any surplus is usually excreted through urine. Depending on individual factors like metabolism and kidney function, it may take a few days to a couple of weeks to clear excess B12 from the system. However, since B12 is stored in the liver, significantly high levels could take longer to normalize. Always consult a healthcare professional for personalized advice.