It typically contains mild soap, softening ingredients such as lanolin, and preservatives such as beeswax. However, some products contain lanolin, honey, and/or beeswax. Hydrolysis of lanolin yields lanolin alcohols and lanolin acids. Many skin creams include common allergens such as fragrances, parabens, and lanolin. Lanolin primarily consists of sterol esters instead. Oils and lanolin are added for specific formula requirements. Other naturally derived lubricants include lanolin (wool grease, a natural water repellent). Carvoline Antiseptic Hair Dressing was a mix of peanut oil and lanolin. Lanolin in shampoo also contains Neu5Gc. Notably, approximately 40% of the acids derived from lanolin are alpha-hydroxy acids (AHAs). In 2000, the European Pharmacopoeia introduced pesticide residue limits into its lanolin monograph. Lanolin and its derivatives are used in the protection, treatment and beautification of human skin. Patch testing can be done if a lanolin allergy is suspected. Cracked nipples can be treated with 100% lanolin. Certain breeds of sheep produce large amounts of lanolin.