Magnesium L-aspartate, with the chemical formula C4H5MgNO4·xH2O, is a coordination complex formed from magnesium ions and the amino acid L-aspartate. It is typically a white or off-white crystalline powder. This compound is a chelated form of magnesium, where the magnesium ion is bound to the carboxylate groups of aspartic acid, which may influence its stability and bioavailability. Its primary application is in the pharmaceutical and nutraceutical industries as a source of bioavailable magnesium. Magnesium is an essential mineral involved in over 300 enzymatic reactions in the human body, including energy production, nerve function, muscle contraction, and bone health. Magnesium L-aspartate is specifically marketed and used in dietary supplements and pharmaceutical preparations aimed at correcting magnesium deficiency, supporting cardiovascular health, and managing conditions like muscle cramps. It is also explored as a potential functional excipient or active ingredient in formulations. Compared to inorganic magnesium salts (e.g., magnesium oxide), the chelated form is often reported to have better gastrointestinal tolerance and absorption. It is generally recognized as safe (GRAS) for use in food supplements. Key considerations in its use include its hygroscopic nature and compliance with pharmacopoeial standards for identity, purity, and magnesium content.