They do not have any additives like sugar, hydrolyzed protein, or preservatives. There are no additives, preservatives, or burning of any kind. Soft drinks may also contain caffeine, colorings, preservatives and other ingredients. The products include additional ingredients such as emulsifiers, preservatives, and perfumes. Soft drinks may also contain caffeine, colorings, preservatives, and/or other ingredients. These people may benefit from a diet with a low content of preservatives and additives. Nitrites are used as food preservatives, e.g. cured meats. Parabens are a class of widely used preservatives in cosmetic and pharmaceutical products. Salts of benzoic acid are used as food preservatives. Clinical insulins are specially prepared mixtures of insulin plus other substances including preservatives. Oils, salts, chocolate, alcohol, and other preservatives should be avoided. They are used for biocidal properties as fungicides, pesticides, algaecides, wood preservatives, and antifouling agents. Copper compounds are used as bacteriostatic agents, fungicides, and wood preservatives. Phenoxyethanol is an alternative to formaldehyde-releasing preservatives. They are typically used as preservatives or antiseptics.