The Methylmalonic Acid test measures the level of methylmalonic acid (MMA) in your blood, which can indicate vitamin B12 deficiency. Elevated MMA levels are often seen in individuals with inadequate B12 levels, leading to various health issues, including fatigue and neurological problems. This test is particularly beneficial for those with absorption issues or dietary restrictions. Understanding your MMA levels can help guide dietary changes or supplementation to ensure adequate vitamin B12 status.