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Vitamin B12 side effects Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says
Because vitamin B12 (cobalamin) is a water-soluble vitamin and your body excretes it daily in your urine, it doesnt build up in the body like fat-soluble vitaminslike vitamin Ddo
Visible changes during this period are minimal for most users
This makes it an appealing option for patients seeking gentler support
Importantly, persistently high serum B12 in the absence of supplementation should prompt GP assessment, as it may indicate underlying disease processes
"A diet including fish, meat and dairy products normally provides an adequate amount of vitamin B12, but people who exclude some or all of these foods, like vegans," explains Holland and Barrett
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