Telomerase activator TA-65 — The Telomere Elongator
TA-65 is a purified plant extract and known telomerase activator that aims to counteract cellular aging by maintaining telomere length. By transiently activating the telomerase enzyme, it helps delay cellular senescence and supports immune function, making it a targeted intervention for age-related telomere attrition.
Mechanism of Action
TA-65 is a highly purified extract of cycloastragenol, derived from the Astragalus membranaceus plant. It acts as a transient activator of the telomerase enzyme (TERT), which adds TTAGGG repeats to the ends of chromosomes, counteracting telomere attrition associated with cellular senescence. By upregulating telomerase activity, TA-65 helps preserve telomere length, particularly in cells with critically short telomeres. This process delays replicative senescence, reduces the secretion of senescence-associated secretory phenotype (SASP) factors, and supports the proliferative capacity of immune cells such as T-lymphocytes.
Human Trial Evidence
Human evidence for TA-65 is mixed but includes several randomized, double-blind, placebo-controlled trials. A 2016 study (Salvador et al.) over one year found that TA-65 significantly lengthened short telomeres in healthy older adults compared to placebo. A 2023 trial (Bawamia et al.) in patients post-myocardial infarction showed that TA-65 enhanced immunity and reduced inflammation, increasing total lymphocyte counts. However, its long-term impact on human lifespan and clinical disease endpoints remains unproven.
Dosing Protocol
250–1,000 mg/day is the most commonly studied and used range in humans. It is typically taken orally, once daily. As a dietary supplement, dose-finding for optimal longevity benefits remains unestablished, though clinical trials have safely used 250 U (approx. 8 mg) to 1,000 U per day for up to a year.
Safety & Contraindications
TA-65 is generally well-tolerated in clinical trials up to one year, with no significant adverse effects reported at standard doses. However, because telomerase activation is a mechanism utilized by many cancers to achieve cellular immortality, there is theoretical concern regarding long-term use and cancer risk. It should be used with caution or avoided in individuals with active malignancies or a high risk of cancer. Long-term safety data beyond a few years are lacking.