Gymnema sylvestre is a woody climbing shrub that's native to the tropical forests of India, Africa and Australia.

Its leaves have been used in the ancient Indian medicinal practice Ayurveda for thousands of years.

It has been a traditional remedy for various ailments, including diabetes, malaria and snakebites.

This herb is thought to inhibit sugar absorption and thus has become a popular study subject in Western medicine.

 

Gymnemic acids are a class of chemical compounds isolated from the leaves of Gymnema sylvestre (Asclepiadaceae). They are anti-sweet compounds, or sweetness inhibitors. After chewing the leaves, solutions sweetened with sugar taste like water.

Chemically, gymnemic acids are triterpenoid glycosides. The central structure is the aglycone gymnemagenin (C₃₀H₅₀O₆).This is adorned with a sugar such as glucuronic acid and with various ester groups. These variations give rise to the different gymnemic acids.More than 20 homologs of gymnemic acid are known.

Gymnemic acid I has the highest anti-sweet properties. It suppresses the sweetness of most of the sweeteners including intense artificial sweeteners such as aspartame and natural sweeteners such as thaumatin, a sweet protein. The anti-sweet activity is reversible, but sweetness recovery on the tongue can take more than 10 minutes

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