It appears that cycloastragenol responsible for telomerase activation and substance used in TA65 is extracted not from well known in Chinese traditional medicine astragalus membranaceous plant but from Astragalus trojanus, a perennial flowering shrub of the Fabaceae family. Astragalus trojanus Stev. is an endemic plant mostly found in eastern and central Anatolia (1300-3500 m), central Aegean region and slopes of Toros mountain (1300-2300 m) in Turkey. Although I asked on Ebay chinese astragalus membranaceous seed seller about trojanus and he claimed this variety is mainly produced in the northern part of China.
I searched for this plant root cuttings and seeds but couldn’t find any sold, there is very little information about Astragalus trojanus. However there seams to be several scientific papers analyzing plant chemical makeup.
Most informative paper seams to be this:
http://www.acgpubs.o...NP-1304-317.pdf
