Or if you'd like a more credible source, this is from the Mayo Clinic.
While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms, higher doses have been found to be safe. Your body absorbs only as much as it needs, and any excess passes through your urine.
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Originally Posted by
Retro Grouch
Fenders protect you from tire splatter. Mudguards protect you from tyre splatter.