Astragaloside IV (Cycloartane Triterpene Saponin · Telomerase Activator · Immune Tonic · Huang Qi)

Compound	Astragaloside IV (Cycloastragenol-3-O-β-D-glucoside)
Chemical class	Terpenoid — Triterpene Saponin (Cycloartane-type; unique tetracyclic triterpene)
CAS	84687-43-4
Primary source	Astragalus membranaceus (Huang Qi / Astragalus root)
Key applications	Telomerase activator; immune modulation; adaptogenic; anti-ageing; antifibrotic; cardioprotective
Claim strength	Moderate
Typical form	Astragalus extract standardised to astragaloside IV (≥0.1–1%); cycloastragenol (≥98%, the aglycone)
Buy from Herbuno	Astragalus Extract Powder (Astragalus gummifer) → Cycloastragenol 98% Powder (Astragalus Root) | High-Purity Isolate | Astragalus membranaceus →

Name origin: From Astragalus (the genus; Latin for ankle bone, referring to the rattling seeds in the pod) + -oside (glycoside). Astragaloside IV is a cycloartane-type triterpene saponin — the cycloartane scaffold features a cyclopropane ring fused to the A/B ring junction, distinguishing it from the more common oleanane, ursane, and dammarane triterpene classes. Astragaloside IV is specifically noteworthy as the natural glucoside precursor of cycloastragenol (its aglycone) — both have been studied for telomerase activation. Telomerase activation — commercial significance: The identification of cycloastragenol and astragaloside IV as telomerase activators (Harley et al., 2011, Rejuvenation Research) sparked significant commercial interest in Astragalus as an “anti-ageing” supplement. TA-65 (a patented cycloastragenol formulation) was commercialised specifically for telomere lengthening — at price points reflecting the high extraction cost and patent position. The telomerase activation evidence is real but modest and remains primarily preclinical or early human. Traditional use: Huang Qi (Astragalus membranaceus) is one of the 50 fundamental herbs of Traditional Chinese Medicine — a foundational adaptogen/tonic used for over 2,000 years for immune support, energy, and longevity. Its polysaccharide fraction (astragalus polysaccharides, APS) and saponin fraction (including astragalosides) work synergistically. Commercial source: Astragalus Extract Powder and Cycloastragenol 98% — is available from Herbuno; both commercially relevant for this compound class.

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Evidence for Astragaloside IV Applications

Telomerase activation and telomere length: In human T-lymphocytes, astragaloside IV and cycloastragenol increase telomerase activity (via transcriptional upregulation of hTERT) and slow telomere shortening in cell culture. The Harley et al. 2011 pilot study with TA-65 (n=97, 1 year) showed telomere lengthening in a subgroup of immune cell populations versus age-matched controls. Subsequent larger studies (n=117) showed immune function improvements but equivocal telomere length effects. The commercial anti-ageing narrative exceeds the current clinical evidence — telomere lengthening has not been demonstrated to improve longevity or healthspan in humans. Claim strength: Emerging (mechanistic; limited human; overhyped commercially).

Immune modulation — NK cell and T-cell function: Astragaloside IV enhances NK cell cytotoxic activity and T-cell proliferation, consistent with traditional Huang Qi use for immune tonification. Multiple animal studies and some human data from Astragalus polysaccharide trials support immune enhancement in immunocompromised states (cancer, chronic disease). Claim strength: Moderate (traditional; animal; some human).

Cardioprotective and antifibrotic: Astragaloside IV is cardioprotective in ischaemia-reperfusion models via PI3K/Akt-mediated cardiomyocyte survival signalling. It also reduces hepatic and cardiac fibrosis in animal models. These are standard Huang Qi cardiovascular indications in TCM. Claim strength: Moderate (animal; consistent with traditional).

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Frequently Asked Questions — Astragaloside IV

What is the difference between astragaloside IV and cycloastragenol?
Cycloastragenol is the aglycone of astragaloside IV — the cycloartane triterpene scaffold without the glucose unit. Cycloastragenol is more lipophilic and has higher bioavailability than astragaloside IV (which undergoes deglycosylation in the gut to yield cycloastragenol as the absorbed form). TA-65 and most “telomere supplement” products use cycloastragenol because it is more bioavailable. Astragaloside IV from whole Astragalus extract delivers cycloastragenol as a metabolite and is the botanical form found in traditional preparations. both forms is available from Herbuno.

Can astragaloside IV actually slow ageing?
Telomere shortening is a biomarker of cellular ageing, and telomerase activation that slows shortening is a plausible anti-ageing mechanism. However: (1) the relationship between telomere length and lifespan is correlative, not proven causal in humans; (2) the clinical evidence for astragaloside IV/cycloastragenol telomere effects in humans is limited to small pilot studies with mixed results; (3) telomerase activation in somatic cells could theoretically increase cancer risk (telomere maintenance is also how cancer cells avoid senescence). The anti-ageing evidence is scientifically interesting but far from proven at clinically meaningful doses in humans.

Is Astragalus safe for cancer patients?
Astragalus polysaccharides have been studied as adjuncts to chemotherapy in Chinese trials, showing immune support benefits. However, the immunostimulatory effects of Astragalus create theoretical concerns in: (1) autoimmune conditions (may worsen); (2) transplant patients on immunosuppressants (may interfere); (3) certain haematological malignancies where immune activation may be counterproductive. The telomerase activation specifically creates concern in oncology settings where preventing cellular senescence could theoretically support tumour growth. Medical supervision for cancer patients considering Astragalus supplementation is appropriate.

Why is cycloastragenol so expensive?
Cycloastragenol is present at approximately 0.001–0.01% of dried Astragalus root — meaning 10,000–100,000 kg of root is needed to produce 1 kg of pure cycloastragenol. This exceptional low natural abundance drives the high cost. TA Sciences (TA-65 patent holder) holds composition-of-matter patents on cycloastragenol for specific applications — licensing costs also contribute to consumer price. Herbuno’s Cycloastragenol 98% is one of the most premium botanical isolates in the catalogue by price-per-gram.

Related compounds: Ginsenoside Rb1, Ginsenoside Rg1, Boswellic Acid, Andrographolide

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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