What is Gymnema Sylvestre Leaf. Originating in the forests of India, Gymnema Sylvestre is also known by the names Miracle Fruit and Gurmari. This popular herb is valued for its traditional use in Ayurvedic therapies. Gymnema Sylvestre leaf is now available in capsules for use as a complimentary dietary supplement.What is Gymnema Sylvestre Leaf used for. Traditionally the leaf of the Gymnema Sylvestre plant is used as a herbal dietary aid for the support of glucose maintenance. In combination with a healthy diet and exercise regime, Gymnema Sylvestre Leaf may help to support the following functions:Maintaining glucose levels in a healthy body.Supporting a healthy digestive system.