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ResorcinolUpdated a month ago

Resorcinol is commonly used in permanent hair dye formulations and also in acne treatment skincare products. The European Scientific Committee on Consumer Safety has classified it as a strong sensitizer, meaning that it may cause an allergic reaction after repeated use. Both animal studies and case-reports involving humans have shown that resorcinol may disrupt thyroid hormone synthesis and produce goitrogenic effects.

Sources:

http://www.annallergy.org/article/S1081-1206(16)30666-4/fulltext
https://onlinelibrary.wiley.com/doi/pdf/10.1002/3527600418.mb10846e0020
https://ec.europa.eu/health/scientific_committees/consumer_safety/docs/sccs_o_015.pdf
http://www.safecosmetics.org/get-the-facts/chemicals-of-concern/resorcinol/
http://www.who.int/ipcs/publications/cicad/cicad71.pdf

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