Nutrition and Supplements Natural Extracts CFN Gymnema Sylvestre St 60 Capsules Gymnema Sylvestre ST is a food supplement based on dry extract of Gymnema Sylvestre with beneficial applications for diabetes mellitus and glycemic imbalances. The herb Gymnema sylvestre is a traditional remedy to support healthy blood sugar levels. Gymnema sylvestre is an herb native to Asia that has been used medicinally for thousands of years in India. How to use Take 2 capsules a day or according to professional prescription.