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Many organs in the body are affected when B12 is low
It helps maintain intratesticular testosterone production, fertility, and testicular size
PMID 18245139
Bibcode:1969PNAS...62..461B
The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians
Disclaimer For research use only
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