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Poor dietary intake of B12-rich foods, such as meat, fish, and dairy products, is one of the most common causes of vitamin B12 deficiency
And the doctor who prescribed it would refute the lack of data, saying the absence of evidence is not evidence of absence, and that his patients are deriving substantial benefit without side effects
If you combine them, do not start both at once, and keep protein and resistance training up
Its an essential nutrient, which means your body cant make vitamin B12, and it must come from outside sources
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