In particular, the saponins contained in ivy leaves have an expectorant effect, that is, they facilitate the expectoration of mucus from the respiratory tract. This can be explained by indirect irritation of a certain nerve (vagus nerve) in the stomach. Saponins further irritate the skin and mucous membranes and stimulate secretion.
The active α-hederin, flavonoids, and chlorogenic acid esters also have antispasmodic effects.
Ivy: side effects
Fresh ivy leaves and the juice extracted from them may cause allergic reactions due to the falacarinol they contain. Cross-reactions with other species of aralia have also been described.
Interactions and contraindications
Currently, there are no known interactions with other agents, nor do contraindications exist. The only exception is if there are known allergies to ivy or other aralia plants, ivy leaves should not be taken.
