Sont-ils nuisibles les conservateurs?

Looking at the list of ingredients of many products, we often discover among them indications of preservatives. These additives are generally based on chemicals, but can also be composed of different sulfates, for example.
Its applications are diverse, it is used in food, fish and sauces, in pain, fruit preparations, sauces and tartine pies, platters and mayonnaise, ketchup and compagnie, etc.