Isopropylparaben (CAS no. 4191-73-5) 

Isopropylparaben is a synthetic compound often used as a preservative in cosmetics and personal care products. It belongs to the paraben family, a class of synthetic compounds used for their antimicrobial and antifungal properties.

Usage in Cosmetics and Household Products
Isopropylparaben is commonly used to extend the shelf life of various products by preventing the growth of harmful bacteria and mold. It can be found in a variety of products, including lotions, creams, ointments, and other skincare products, as well as in makeup, shampoos, and conditioners.

Other Names/Synonyms
  • Isopropyl 4-hydroxybenzoate
Skin Sensitivities and Allergies
Some individuals may experience skin irritation or allergic reactions to Isopropylparaben, particularly those with sensitive skin or existing skin conditions. Symptoms may include redness, itching, and swelling. Parabens have also been linked to contact dermatitis in some cases.

Other Risks
The use of parabens, including Isopropylparaben, has been a topic of concern due to potential endocrine-disrupting effects. Some studies have suggested that parabens may mimic estrogen in the body, possibly leading to hormonal imbalances. However, the exact impact and the level of risk associated with paraben exposure remain topics of ongoing research and debate.

Regulatory Ban
In California, under Assembly Bill No. 496 (Chapter 441), Isopropylparaben is listed as one of the banned ingredients in cosmetic products effective January 1, 2025. This prohibition extends to manufacturing, selling, delivering, holding, or offering for sale any cosmetic products that intentionally contain Isopropylparaben among other specified ingredients, due to potential health risks.

Given the potential health concerns and the regulatory ban in places like California, consumers, particularly those with sensitive skin, are advised to exercise caution when using products containing Isopropylparaben or other parabens. Checking the ingredient list on cosmetic and personal care products for Isopropylparaben or its synonyms can help in making informed choices.

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