'''Cikloastragenol''' je [[sapogenin]] koji je prisutan u biljci -{''[[Astragalus membranaceus]]''}-.<ref>{{cite journal | pmid = 18981163 | year = 2008 | author author1=Fauce, SR; |author2=Jamieson, BD; |author3=Chin, AC; |author4=Mitsuyasu, RT; |author5=Parish, ST; |author6=Ng, HL; |author7=Kitchen, CM; |author8=Yang, OO et al. | title = Telomerase-based pharmacologic enhancement of antiviral function of human CD8+ T lymphocytes | volume = 181 | issue = 10 | pages = 7400–6 | pmc = 2682219 | journal = Journal of immunology }}</ref> On je u prodaji pod imenima -{''TA-65''}- ili -{''TA-65MD''}- u SAD-u. Proizvodi ga kompanija -{''Telomerase Activation Sciences, Inc.''}-. TA-65 se pojavio na tržištu [[2005]].
Cikloastragenol umereno povećava aktivnost [[telomeraza|telomeraze]] i proliferativni kapacitet [[T pomoćne ćelije|CD4]] i [[Citotoksične T ćelije|CD8 T ćelija]].<ref>{{cite journal | url=http://www.jimmunol.org/cgi/content/meeting_abstract/182/1_MeetingAbstracts/90.30 |title=Cycloastragenol extends T cell proliferation by increasing telomerase activity |year=2009 | journal = The Journal of Immunology | volume = 182 | issue = Meeting Abstract Supplement | author author1=Valenzuela, Hector F; |author2=Fuller, Thomas; |author3=Edwards, Jim; |author4=Finger, Danielle; |author5=Molgora, Brenda }}</ref> Postoje indikacije da je on posebno efektivan kod [[citomegalovirus]]-pozitivnih osoba.<ref>{{cite journal |author author1=Harley, Calvin B; |author2=Liu, Weimin; |author3=Blasco, Maria; |author4=Vera, Elsa; |author5=Andrews, William H; |author6=Briggs, Laura A; |author7=Raffaele, Joseph M |title = A Natural Product Telomerase Activator As Part of a Health Maintenance Program|journal=Rejuvenation Research|date = 1. 2. 2011.|volume=14|issue=1|pages=45–56|doi=10.1089/rej.2010.1085|accessdate = 19. 4. 2012.}}</ref>
