preservative
Things that help your cosmetic products not to behave like food: go off even in the fridge in a week or two. They are typically not the most skin friendly ingredients, but a) they are very important and without them you are risking cosmetic product safety, b) they are used in tiny amounts where they are totally safe.
Sodium Benzoate
Sodium Bisulfite
Sodium Dehydroacetate
Sodium Ethylparaben
Sodium Formate
Sodium Hydroxymethylglycinate
Sodium Metabisulfite
Sodium Methylparaben
Sodium Paraben
Sodium Propylparaben
Sodium Salicylate
Sodium Sorbate
Sodium Sulfite
Sorbic Acid
Soytrimonium Chloride
Spectrastat
Stearalkonium Chloride
Steartrimonium Bromide
Steartrimonium Chloride
Tallowtrimonium Chloride
Tea-Salicylate
Thimerosal
Thymus Vulgaris Leaf Oil
Tinosan
Triclocarban
Triclosan
Tropolone
Undecylenic Acid
Usnea Barbata Extract
Xylityl Caprate/Caprylate
Zanthoxylum Piperitum Fruit Extract
Zinc Pyrithione