Used primarily in medical applications as a phosphate binder for patients with chronic kidney disease. It helps reduce phosphate levels in the blood by binding to dietary phosphate in the gastrointestinal tract, preventing its absorption. The compound is taken orally and is effective in managing hyperphosphatemia, especially in individuals undergoing dialysis. Its low systemic absorption minimizes the risk of lanthanum accumulation in tissues, making it a safer option for long-term use. Also investigated for potential use in catalysis and environmental applications due to lanthanum’s affinity for anions, though medical use remains the primary application.