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Tests found that levels of three substances, eicosane, hippuric acid and octadecanal, were all higher than normal in the sebum of Parkinson’s patients, while levels of a fourth substance, perillic aldehyde, were lower.

The research revealed that a number of compounds, particularly hippuric acid, eicosane, and octadecanal, were found in higher than usual concentrations on the skin of Parkinson's patients.

They were found to contain traces of the hippuric acid associated with animal, particularly ungulate, urine, and euxanthic acid—a possible by-product of the metabolic processing of mango leaves.

Quinic acid, which is present in cranberries, is metabolized by the body into hippuric acid, a substance that in very high concentrations is toxic to E. coli, the pathogen most commonly to blame for U.T.I.s.

So they don't like chlorine, or creatinine, or hippuric acid.