Limited evidenceLongevity & antioxidants

Telomere Support Formulas

Astragalus-derived blends (TA-65, cycloastragenol) sold to lengthen telomeres. Pooled trials do show longer measured telomeres, but the same analysis found no matching improvement in strength, frailty or inflammation.

Evidence last reviewed: August 2026

What the science says

Measured telomere length increases Moderate evidence
A 2025 systematic review and meta-analysis of 8 randomized trials (750 participants, mean age 63) found moderate telomere elongation with TA-65 (SMD 0.47), larger in people over 60. Industry-funded trials reported noticeably bigger effects than independent ones.
No improvement in how people actually function Moderate evidence
The same meta-analysis found no effect on frailty measures (grip strength, SPPB, 6-minute walk; SMD 0.09) and none on CRP or IL-6 — a disconnect between the biomarker being sold and the outcomes buyers care about.
The original placebo-controlled trial Limited evidence
A 1-year double-blind trial in 117 CMV-positive adults aged 53–87 found telomere lengthening with the low dose (250 units) but not with the high dose, an inconsistent dose pattern; the study was funded and staffed by the manufacturer.

Dosage & safety

Studied doseTrials used roughly 250–1000 units/day of TA-65 (about 10–50 mg/day in cycloastragenol terms) for 12 months. Generic "telomere support" blends rarely disclose comparable amounts.

SafetyPooled trials reported mild gastrointestinal effects (nausea ~7%, abdominal discomfort ~5%) and no severe adverse events over 12 months. The long-term consequence of chronically activating telomerase — including cancer risk — is unstudied. Avoid with an active or past malignancy unless your oncologist agrees. Very expensive relative to the evidence.

Scientific references

Effects of TA-65 on telomere length, functional outcomes, and inflammation: a systematic review and meta-analysis
Su X, Wang C, Gou Z — Cell Biol Toxicol, 2025
A Natural Product Telomerase Activator Lengthens Telomeres in Humans: A Randomized, Double Blind, and Placebo Controlled Study
Salvador L, Singaravelu G, Harley CB — Rejuvenation Res, 2016

Where to buy

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