This add-on measures the level of sodium (Na) in your blood, a key electrolyte that helps regulate fluid balance, nerve signals, and muscle function. Sodium is essential for maintaining proper hydration, blood pressure, and normal cellular function. Abnormal sodium levels—whether too high or too low—can lead to symptoms like fatigue, confusion, headaches, or muscle weakness, even if these signs are subtle or absent.

Read our complete guide to Sodium →