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Written on labels as: Resorcin, 1,3-dihydroxybenzene, and 1,3-benzenediol

Found in the following products: Hair color, bleaching products, hair dyes, shampoos, lotions, and peels

Chemical purpose: Resorcinol is used to bond the dye permanently to hair and is mixed with other chemicals to get a specific dye color.

Potential harmful risks:
Endocrine disruption: Studies show that resorcinol disrupts thyroid function. It inhibits activation of the thyroid hormone receptors and enzymes involved in thyroid hormone synthesis.

Organ system toxicity: Symptoms of resorcinol toxicity at high concentrations include damage to the central nervous system, convulsions and respiratory failure.

Skin irritant: Resorcinol is an irritant to the skin and eyes.

Lynch B, Delzell E, Bechtel D. (2002) Toxicology Review and Risk Assessment of Resorcinol: Thyroid Effects. Regulatory Toxicology and Pharmacology 36 (2): 198-210.
Duran B, Gursoy S, Cetin M, Demirkoprulu N, Demirel Y, Gurelik B, (2004) The oral toxicity of resorcinol during pregnancy: a case report. Clinical Toxicology 42 (5): 663-666.

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