The code for the ingredients parsing is in [https://github.com/openfoodfacts/openfoodfacts-server/blob/master/lib/ProductOpener/Ingredients.pm Ingredients.pm]
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In Q1 and Q2 2020, we made [https://github.com/openfoodfacts/openfoodfacts-server/commits/master/lib/ProductOpener/Ingredients.pm a lot of improvements], big and small.
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For instance:
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* [https://github.com/openfoodfacts/openfoodfacts-server/pull/3357 Handling enumerations of vitamins in Finnish]
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* [https://github.com/openfoodfacts/openfoodfacts-server/pull/3254 A better match for the signs like * that indicate organic ingredients]