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For the 96.4% of adults without deficiency, however, injections offer no performance advantage despite marketing claims suggesting otherwise
Both probiotics and prebiotics have a variety of biological actions, including outcompeting pathogenic microorganisms in the digestive tract, inactivating harmful metabolites, producing powerful bioactive molecules (short-chain fatty acids), modulating immune and metabolic signaling, improving overall digestive tract function, and enhancing central nervous system effects through the gutbrain axis
PMCID: PMC3856187
They use blood tests to check Vitamin B12 levels
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