The historical clinical collection describes Tribestan as an original Bulgarian phytochemical product of plant origin. It states that the active components are non-steroidal saponins of the furostanol type isolated from Tribulus terrestris L.
Historical standardization description
The source material states that the substance was standardized on the basis of the main compound protodioscin, described in the earlier document as not less than 45% of the total quantity. This is a historical formulation and should not be confused with the specification printed on a current retail package.
Historical physical description
The earlier source describes the substance as a yellow-brown amorphous powder with a specific aroma and bitter taste, soluble in water, sparingly soluble in methyl alcohol and insoluble in chloroform.