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Parabens are esters of para-hydroxybenzoic acid, from which the name is derived. Common parabens include methylparaben (E number E218), ethylparaben (E214), propylparaben (E216), butylparaben and heptylparaben (E209). Less common parabens include isobutylparaben, isopropylparaben, benzylparaben and their sodium salts.
Although parabens (the group of chemicals in which Methylparaben belongs) are generally considered safe when used in low percentages (.04% - .08%), many studies have found a link between parabens and breast cancer.