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It tells you if youre really low on B12 or if something else might be causing your tiredness or slow weight loss

This is particularly beneficial for individuals experiencing general weakness or exhaustion

Biochemical pharmacology 86 , 200209, doi: 10.1016/j.bcp.2013.05.007 (2013)

Foods that contain high levels of B-12 include eggs, milk, cheese and other dairy products, poultry, fish and shellfish

Mechanistic studies in animal models suggest that mucosal targeting is likely to offer better protection against respiratory infections [43], but methods for inducing mucosal immunity are in the earliest stages of testing