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The roots of "Primula veris" contain several glycosides of 5-methoxysalicylic methyl ester, such as primeverin and primulaverin. In the dried crude root, their phenolic aglycones are responsible for the typical odour reminiscent of methyl salicylate or anethole. The dried roots contain significant amounts of triterpene saponins, such as primula acid I/II, while in the flower these constituents are located in the sepals, and the dominating constituents are flavonoids. Rare side effects of the saponins can be nausea or diarrhoea while some of the phenolic constituents are possibly responsible for allergic reactions.