"Electrolyte sodium" refers to a substance called sodium that is present in our body and helps conduct electrical signals necessary for various bodily functions. Full definition
The fruit and dairy helps replenish electrolytes sodium, potassium, and calcium, which are critical for muscle function. (health.com)
Do not omit essential electrolytes: Sodium (Na +), Chloride (Cl --RRB-, Potassium (K +), Magnesium (Mg + +), Calcium (Ca + +), Phosphate (HPO4 ---RRB-, Bicarbonate (HCO3 --RRB-, Lack of electrolytes or more pointedly the bodies primary electrolyte sodium (aka Salt) is responsible for lethargy, brain fog and keto flu symptoms on LCHF diets. (myketokitchen.com)
One of the top mistakes people make is not getting enough electrolytes there are three important electrolytes sodium, magnesium, and potassium. (lowcarbalpha.com)