Polypodium Decumanum Fern

Has anybody had experience of using Calaguala extract from Polypodium Decumanum Fern? Kalawalla Polypodium leucotomos 50:1 standardized extract Kalawalla is an herbal supplement derived from Polypodium leucotomos plant (a traditional herb which has been used because of its medicinal and healing properties). It is also known as Heliocare, Rapuani and Polypodiaceae. The ancient Mayans used Polypodium leucotomos as part of their daily diet in the form of tea as a blood purifier. They attributed healing properties to the drink and up until today the drink is still popular in Honduran tradition. Europeans have used Polypodium leucotomos extract for over 10 years as part of an overall health program to maintain their immune system at its strongest. many thanks, Katie