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This is especially important if: You follow a vegetarian or vegan diet You've had bariatric surgery You have digestive disorders that might affect absorption You're taking certain medications that interfere with B12 Monitoring Your B12 Levels If you're concerned about your B12 status, your healthcare provider can order simple blood tests to check: Serum B12 levels Methylmalonic acid (MMA) Homocysteine levels These tests provide a clearer picture of your actual B12 status than symptoms alone

Matsumoto M, Pocai A, Rossetti L, DePinho RA, Accili D

Plant Physiol 137:428446 Hasan MK, Cheng Y, Kanwar MK et al (2017) Responses of plant proteins to heavy metal stressa review

This is an example in which measurements of the total pyridine nucleotide levels led to little understanding of the underlying redox change, and discussions of the malate/pyruvate and potentially pyruvate/lactate, if available, would have conveyed a better understanding of how redox metabolism was altered