Lip care is the most common blind spot. Many mainstream lip balms and lipsticks rely on lanolin or its derivatives for texture and shine, and some lip products are based largely on lanolin.
Vitamin D3 is the second major surprise. Most cholecalciferol used in supplements, multivitamins, and fortified foods such as plant milks, cereals, and orange juice is synthesized from lanolin. A product can be entirely plant-based in its main ingredients yet fortified with lanolin-derived D3. Vegan certification or an explicit "vegan D3" claim is the practical way to rule this out. Vitamin D2 (ergocalciferol), by contrast, is not animal-derived.
Beyond food and cosmetics, lanolin appears in shoe polishes, leather conditioners, rust-preventive coatings, lubricants, and baby skincare products. Nipple creams for breastfeeding are a notable category: pure lanolin is the conventional standard there, which makes it directly relevant to vegan parents seeking alternatives.