2,3-Diphospho-D-glyceric acid pentasodium salt is a highly anionic polyphosphorus compound located within the concave center of red blood cells, where it decreases oxygen affinity by binding to hemoglobin. This endogenous compound selectively inhibits vascular calcification (VC) and effectively postpones the formation of crystalline calpain particles (CPP). Additionally, it inhibits calcification in the mouse vascular smooth muscle cell line (MOVAS) without eliciting cytotoxic effects [1].