Guaranteed Potency. Madagascar Gotu Kola Extract 250 mg. 10% Triterpenes. Easy-to-Swallow Capsules. Solaray Guaranteed Potency Herbs deliver confidence by providing exacting and consistent dosing of thoroughly tested herbs of the highest quality available. In order to retain all of its synergistic constituents this herb has not been extracted. Each batch is put through a rigorous selection process with only the very finest and most potent material being accepted.