All food except the following is considered halal (which is haram)
Pork / pork and its by-products (eg gelatin etc.)
Alcoholic beverages and drugs
Reptiles and insects
Carnivorous animals, birds of prey and some other animals.
Foods like gelatin, enzymes, emulsifiers and flavors are questionable (mashoboh), as the origin of these ingredients is not known.
Preparation, processing and manufacturing equipment should be free from all of the above.
The above rules also apply to all raw materials used in the manufacture of your product.
Food products should be free from all of the following
Pig or dog blood
Blood
Human body part or by-product e.g. Human hair in L-cysteine
Carnivores (except fish)
Birds living with matchsticks or sparrows that feed by snatching and ripping e.g. Eagles and other similar birds
Reptiles and insects
Any marine animal except fish
Animals that live on the ground and in water (amphibians) like frogs, crocodiles and other similar animals.
The animals that are killed are by any means other than slaughter according to Islamic law.
Animals that are generally considered repellent as lice such as lice, maggots, mice, rats, spiders and other similar animals.
Animals are allowed under Islamic law (i.e. cow, sheep, lamb, goat, hen, etc.), which are not slaughtered according to Islamic law. (Note: Most animals in the UK are not slaughtered according to Islamic law).
Wine, ethyl alcohol or spirit
Intoxicating and dangerous plants
Any product or by-product (any product temporarily used as an alternative or for testing) in any one or more of the above products (as defined in sections 1 to 13.) Is derived from, although in minute amounts, as an ingredient or as a residual or a processing aid or as a release agent or as a glazing agent or as an additive In form or in the form of a color or in any other form, is haram (unlawful) for Muslims
Preparation, processing and manufacturing equipment should be exempt from all of the above as defined in sections 1 to 14.
Packaging materials, which come into contact with a food product, must be free from all of the above as defined in sections 1 to 14.
The above rules also apply to all raw materials used in the manufacture of your product. You may have to forward this definition to your suppliers / manufacturers to confirm the suitability of your product.