Mostly it is a jellylike substance extracted from animal source.
Ahmad Hasan Sakr of Chicago, USA, which is originally taken from the following sources: Al-Mawsou’s fi Uloom al-Tabi’a, Edward Chalib, Beirut 1965-66 Le Guide marabout de la peche en mer Michel van Haver - 1982 - FRANCE. Les Poissons D’eau Douce Jiri Cihar 1976 – FRANCE. Guide des Poissons D’eau Douce et Peche Bent J. Muvs et Preben Dahistrom 1981 – SUISSE. Encyclopedie Illustree des Poissons Stanislav Frank – PARIS.
Encyclopedie du Monde Animal Tome 4 (Les Poissons et Les reptiles) Maurice Burton. Bibliotheque Marabout – PARIS. Explanation on Ingredients and Preservatives Used in Food Products In this Appendix, I am listing some of the ingredients and components that are usually added to the food. These ingredients come from vegetable soure or animals or are produced chemically.
Since the labels on the food products do not list the origin of the ingredients, there is no way of classifying them as halal or haram , except by referring to the manufacturers. As for the ingredients that shall be listed here, I have tried to ascertain the suitability of their halal use based on the information that I could gather.
However, one should know that if an ingredient that is completely absorbed in a food product [and cannot be detected unless we are told by the manufacturer], it is not obligatory in the shari‘a to inquire about such ingredients to ascertain that they are free of haram substances. (See the chapter on “Food & Drink”.) Acetic Acid: It is found naturally in plant juices; it can also be produced chemically [from oil petroleum], and can also be derived from animal tissues.
If it is extracted from plant juices or chemicals, there is no problem in using it in food products. But, if it is extracted from animal tissues, the permissibility of using it depends on the animal having been slaughtered Islamically. [If the origin is unknown, one can still use it.] Adipic Acid: It is from vegetable origin. It can also be produced from chemicals. Therefore, there is no problem in using it in food products. Agar Agar: It comes from seaweed.