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A Vitamin B12 test is a blood test used to measure the levels of vitamin B12 (also known as cobalamin) in the bloodstream
All efficacy claims derive from animal studies
Its a question we get all the time, and honestly, its one of the most critical
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A vegetarian diet which contains no animal products (including milk products or eggs) does not supply any vitamin B12
doi:10.1097/ICO.0000000000000379
The cause is multifactorial: reduced caloric intake, slower gastric emptying, mild dehydration if water intake drops with appetite, and elevated B12 demand during a rapid metabolic shift
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