Potassium 7-hydroxy-1-naphthalenesulfona is naturally present in the fruit of the Rubiaceae gardenia, the flowers of the Iridaceae crocus, and the flowers and leaves of the Scrophulariaceae Scrophulariaceae.

Erucifoline is a pyrrolizidine alkaloid that can be found in the aerial parts of Senecio aquaticus.

Vanillin is mainly used as a flavouring agent, primarily in foods and beverages such as chocolate and dairy products, but also to mask unpleasant tastes in medicines or livestock fodder.