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Vitamin B12 deficiency is one of the most common nutrient deficiencies in the world, especially for vegetarians, vegans and people with health conditions such as Crohns Disease or Celiac Disease which makes it hard to absorb nutrients
Rapid progression also prevents accurate assessment of what concentration actually delivers results
Potential candidates include people interested in improving mitochondrial function, supporting cognitive performance, or optimizing metabolic health
Endocrinology 147 , 58555864 (2006)
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