Butylparaben is one of the most common bactericidal/fungicidal additives in cosmetics. It has been used in cosmetic products since the 1940's and in pharmaceutical products since 1924.[7] The popularity of butylparaben in these products is due to its low toxicity in humans and its effective antimicrobial properties, in particular those against mold and yeast.[8] It is now found in more than 20,000 cosmetic products including eye shadow, facial moisturizer/treatment, anti-aging cream, foundation, and sunscreen.[9] It is also used as low-ionic strength solutions as a preservative in some foods and drugs.[10] In most cosmetics paraben is used at low levels, ranging from 0.01 to 0.3%.[11]