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Products containing any aldehydes more than 0.001% in leave-on products or 0.01% in rinse-off products were required to list the ingredients explicitly in their product labels. [ 6 ] The US Federal Occupational Safety and Health Administration (OSHA) sets a long-term permissible exposure limit (PEL) of 0.75 ppm of formaldehyde in the air, and a ...
One National Institute of Health study of nearly 34,000 women found that those who used hair straightening products more than four times a year were twice as likely to develop uterine cancer.
Hair straightening is a hair styling technique used since the 1890s involving the flattening and straightening of hair in order to give it a smooth, streamlined, and sleek appearance. [1] It became very popular during the 1950s among black males and females of all races.
A product falsely marketed as chemical-free in the 1990s, the Rio Hair Naturalizer System, led to a class action lawsuit against the manufacturer, the World Rio Corporation Inc., when the acidic chemicals it contained caused scalp damage and/or hair loss to thousands of users. [2] [3] The product was eventually withdrawn from the market. [3]
Keasling says that the sulfate-free formula is “perfect for over-processed or damaged hair and helps build back the keratin in the hair to make it stronger and more resistant to future breakage.”
Prestige then sold Prell, along with its other two shampoo brands, Denorex and Zincon, to Ultimark Products in October 2009 in order to focus more on their two larger segments: over-the-counter healthcare and household cleaning products. In July 2016, Scott's Liquid Gold-Inc. acquired Prell, along with the Denorex and Zincon brands, from ...