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Individuals with Poor Absorption: People with low stomach acid, or those who have had certain surgeries (like gastric bypass), may struggle to absorb B12 from food and would benefit from injections
[139] [140] The work required the effort of 91 postdoctoral fellows (mostly at Harvard) and 12 PhD students (at ETH Zurich) from 19 nations
Some symptoms of a B12 deficiency include: Feelings of fatigue Anxiety or nervousness Weakness Shortness of breath Tingling sensation in the digits Diarrhea and numbness, among other things These are just some of the common symptoms
PMC 5282855
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