Isobutylparaben (CAS no. 4247-02-3)

Isobutylparaben is a synthetic compound used as a preservative in cosmetics and personal care products. It belongs to the paraben family, which are esters of para-hydroxybenzoic acid, and like other parabens, it's used to extend the shelf life of these products by preventing the growth of harmful bacteria and mold.

Usage in Cosmetics and Household Products
Isobutylparaben is found in a variety of cosmetic and personal care products including but not limited to lotions, creams, ointments, shampoos, conditioners, and makeup products. It's valued for its antimicrobial properties which help to preserve the integrity and safety of products over time.

Other Names/Synonyms
  • Isobutyl 4-hydroxybenzoate
  • 4-Hydroxybenzoic acid isobutyl ester
Skin Sensitivities and Allergies
Some individuals may experience skin irritation or allergic reactions when exposed to isobutylparaben, particularly if they have sensitive skin. Symptoms may include redness, itching, and swelling. There have also been concerns about parabens potentially disrupting the endocrine system due to their ability to mimic estrogen, although the scientific community has not reached a consensus on the level of risk posed by parabens in cosmetics.

Other Risks
The potential endocrine-disrupting properties of isobutylparaben may pose additional risks, especially with long-term exposure. There have been studies suggesting a link between paraben exposure and certain types of cancer, although more research is needed to fully understand the relationship.

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

Considering the regulatory restrictions and potential health concerns associated with isobutylparaben, consumers, especially those with sensitive skin, are advised to check the ingredient lists of cosmetic and personal care products. Alternative, paraben-free products may be a safer choice for those looking to minimize potential risks associated with isobutylparaben exposure.

How safe is it?

Hang tight. We're thinking.