Oxalic acid (in gastrointestinal tract lumen)

Oxalic acid is a small, strong dicarboxylic acid found in high levels in certain vegetables and plant foods, present in the gastrointestinal tract both from dietary sources and endogenous secretion[1][7][8][9]. In the intestine, free oxalic acid can bind to minerals such as calcium and magnesium, reducing their absorption[1][7][9]. Some oxalic acid is degraded by oxalate-metabolizing bacteria (notably Oxalobacter formigenes), but the remainder may be absorbed into the body and ultimately excreted via urine, contributing to the risk of calcium oxalate kidney stone formation in susceptible individuals[2][8][9][10]. Unlike classical drug targets such as enzymes or receptors, free oxalic acid is a metabolite and not a macromolecular target; thus, it is not considered a therapeutic target itself. In summary, "Gastrointestinal tract luminal free oxalic acid" is not a canonical target but instead reflects a small molecule/metabolite with physiological and clinical consequences relevant to nutrition, nephrology, and gastrointestinal health.

Other names

Oxalate (when deprotonated)free oxalategastrointestinal oxalic acidGI lumen oxalic acid

Not applicable (since this is not a molecular target for drugs); however, some probiotics or therapeutics (e.g., certain bacteria like Oxalobacter formigenes) can degrade oxalate in the gut[5][7][9]