Gelatin

Gelatin made from porcine skin or bones, which makes up roughly 50% of the supply of gelatin on the market, is forbidden.

Gelatin made from other animals, for example, fish is acceptable. Kosher gelatin comes from certain fish to avoid the Kashrut (Jewish) prohibition against mixing meat (fish is not considered meat) and dairy in the same meal. (Muslims can mix meat and dairy.) Therefore, gelatin in food items certified as Kosher is halāl, as it is from fish. However, it is typical to use algal sources of thickeners, in the home or in commercial products, to ensure they are halāl.