Oxalic acid inhibits calcium absorption.
Oxalic acid is an organic acid with the chemical formula HO₂C−CO₂H and the systematic name ethanedioic acid. It is the most basic dicarboxylic acid. It is a white crystalline solid that dissolves in water to form a colorless solution.
While oxalic acid is a normal byproduct of mammalian metabolism, excessive oxalic acid consumption may result in stone formation in the urinary tract when the acid is excreted in the urine. Soaking and cooking oxalate-rich foods will reduce the oxalate content by leaching.
Oxalic acid poisoning can cause headaches, dizziness, nausea and vomiting, convulsions, coma, and even death. A skin rash, pain, redness, blisters, and slow healing ulcers can result from prolonged or repeated contact.
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