Check for the "use-by" date on its packaging of Sodium Benzoate.
Sodium Benzoate can cause headache, fainting, blurred vision, chest pain, slowed heartbeat and slurred speech. It can also cause blue colouring of lips and blood vomiting.(2)
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Sodium Benzoate is a sodium salt of benzoic acid. It is a white colour powdered salt which is produced by reacting sodium hydroxide and benzoic acid. It is soluble in water and widely used as a food preservative.