When the compositions are thickened or are presented in the form of gels, they contain one or more thickeners which can be chosen from sodium alginate or gum arabic, cellulose derivatives such as methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose and carboxymethyl cellulose, guar or its derivatives, heterobiopolysaccharides suc