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Thank you for sharing an interesting article. After reading that, I think it may be important to read the ingredients to boxed labels or inquire with your salon. I have never had an MG related reaction to hair dye. I have always gone to a salon and due to the length of time having to sit there as well as cost I only go about every 6mo instead of 4-6wks which is less exposure. I have blonde hair so have not used any products that had that ingredient but I will be more cautious going forward.