Methylmalonic Acid (MMA) is a laboratory metric that reflects the body’s ability to convert certain fatty acids and amino acids into energy, and it is often used as a functional indicator of vitamin B12 status. Elevated MMA levels can suggest a functional B12 deficiency, which may arise from inadequate dietary intake, malabsorption disorders, or certain medications that interfere with B12 metabolism; higher concentrations are associated with fatigue, neuropathy, and cognitive changes. Conversely, lower MMA levels are generally considered normal and imply adequate B12 availability. Factors such as chronic gastrointestinal disease, use of proton‑pump inhibitors, or strict vegetarian diets can influence MMA concentrations, while proper supplementation or dietary adjustment typically reduces elevated values.
Lab metric
Methylmalonic Acid
Methylmalonic Acid (MMA) is a laboratory metric that reflects the body’s ability to convert certain fatty acids and amino acids into energy, and it is often used as a functional indicator of vitamin B12 status. Elevated MMA levels can suggest a functional B12 deficiency, which may arise from inadequate dietary intake, malabsorption disorders, or certain medications that interfere with B12 metabolism; higher concentrations are associated with fatigue, neuropathy, and cognitive changes. Conversely, lower MMA levels are generally considered normal and imply adequate B12 availability. Factors such as chronic gastrointestinal disease, use of proton‑pump inhibitors, or strict vegetarian diets can influence MMA concentrations, while proper supplementation or dietary adjustment typically reduces elevated values.


