Chemical preservatives are not natural substances and they are very controversial, and some may be toxic at certan levels. . Examples include: Benzoic acid, Erythorbic acid, Thiodipropionic acid, Butylated hydroxyanisole (BHA), Butylated hydroxytoluene (BHT), Calcium sorbate, Ethoxyquin, Dilauryl thiodipropionate, Methylparaben, Potassium bisulfite, Potassium metabisulfite, Propylene glyco, lPropylparaben, Sodium metabisulfite, Sodium propionate, Sodium sorbate, Sodium sulfite, Stannous chloride, Sulfur dioxide, and TBHQ – Tertiary butylhydroquinone.
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