Which product contains dairy that must be kosher?

Margarine must be kosher if it contains dairy because it is a product that can incorporate milk derivatives, such as whey or casein, which come from cows. In kosher dietary laws, the separation of meat and dairy is essential. Therefore, if margarine has dairy ingredients, it must be certified as kosher to ensure compliance with these religious food laws.

While hard candies, chewing gum, and pure chocolate can also contain dairy, not all types of these products necessarily do. For instance, many hard candies and some chewing gums are produced without dairy ingredients, and there are also varieties of pure chocolate that do not include milk. Each of these products may vary widely in terms of ingredient lists, making the kosher status highly dependent on the specific product and manufacturer. Thus, the emphasis on margarine highlights its common association with dairy and the specific need for kosher certification when such ingredients are present.