What chemical preservative is commonly used in foods and what are its side effects?

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Roberto Molteni

In European Union, the food additive are identified by a number (e.g. E200 to E299 are preservative) (first link)

For information regarding safety etc, you can check at the European Food Safety Authority (EFSA) (second link)

https://webgate.ec.europa.eu/sanco_foods/main/?event=substances.search&substances.pagination=1

http://www.efsa.europa.eu/en/publications

Saifeldin Mohamed Khair Abdelrahim

below you will find a link to 6 common food preservatives and their side effects

http://www.dietsinreview.com/diet_column/11/6-common-food-preservatives-and-their-nasty-side-effects/