Alcohol or any animal derived ingredient that does not meet the halal criteria. Ingredients below are commonly found in mainstream makeup and skincare brands. Keratin: a natural protein often derived from animals and used mainly in hair care products. Carmine: made from crushed beetles and often used in lipsticks to give it the bright colour.  Oleic acid: fatty acid that can derive from animals and plants so this one is a bit tricky to gauge. Oleic acid is found in cosmetic creams and soaps.  If the company has a vegan certification then the oleic acid will be plant based. Lanolin alcohol: produced from the fat of wool (sheep).  It is found in most creams.  Gelatin: The most commonly known animal derived ingredient, which is made by boiling the skin, cartilage, and bones of animals, including pork skin, horns and cattle bones.