Vitamin B12
What it is
Vitamin B12 is an essential nutrient your body needs to make red blood cells and maintain healthy nerve function, and it's obtained almost entirely from animal products.
Why it matters
B12 deficiency can develop slowly and is easy to miss because early symptoms, fatigue, brain fog, tingling in hands and feet, overlap with many other conditions. It's especially common in people following plant-based diets, older adults with reduced absorption, and anyone on long-term acid-reducing medication. Because B12 works closely with folate in the same metabolic pathway, and both feed into homocysteine metabolism, it's typically most useful interpreted alongside those markers rather than alone.
Vitamin B12 is one of the markers in Zaro's Signal panel and every tier above it.
This information is for educational purposes and is not a substitute for professional medical advice. Always talk to a physician about your specific results and health history.
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