Aspalathin (Dihydrochalcone C-Glycoside · Antidiabetic · Cardioprotective)

Compound	Aspalathin
Chemical class	Polyphenol — Dihydrochalcone C-Glycoside
CAS	88597-18-6
Primary source	Aspalathus linearis (rooibos / red bush, South Africa)
Key applications	Antidiabetic, cardioprotective, antioxidant
Claim strength	Moderate
Typical form	Green rooibos extract (aspalathin-standardised); fermented rooibos extract
Buy from Herbuno	Request availability and bulk pricing →

Name origin: Directly from Aspalathus linearis, the sole known commercial botanical source of aspalathin. It is unique among dihydrochalcones as a C-glycoside (glucose bonded directly to C-6 of the A-ring) — conferring acid stability and resistance to gut hydrolysis similar to puerarin in the isoflavone class. Traditional use: Rooibos (Afrikaans: red bush) has been consumed as an herbal tea by Khoisan peoples of the Cederberg region of South Africa for centuries, used for colic, digestive complaints, and general wellness. Aspalathin was identified as rooibos’s primary and unique polyphenol when the plant was first phytochemically characterised in the 1960s. Research trajectory: Aspalathin has attracted substantial South African and international research for antidiabetic activity (GLUT4 stimulation, AMPK activation), cardioprotection (ischaemia-reperfusion), and antioxidant activity. Green (unfermented) rooibos has higher aspalathin content than fermented (red) rooibos, as aspalathin is partially degraded during fermentation. Commercial source: Aspalathin-standardised green rooibos extract is available from South African specialist producers. Contact Herbuno for sourcing enquiries.

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Evidence for Aspalathin Applications

Antidiabetic and insulin-sensitising: Aspalathin stimulates glucose uptake in skeletal muscle cells via GLUT4 translocation and AMPK activation — an insulin-independent pathway. In diabetic animal models (db/db mice, STZ rats), aspalathin reduces blood glucose, improves insulin sensitivity, and reduces gluconeogenic gene expression in the liver. Small human clinical data from rooibos tea consumption studies show trends toward improved fasting glucose. Claim strength: Moderate.

Cardioprotective and anti-ischaemic: Aspalathin protects cardiomyocytes from ischaemia-reperfusion injury in ex vivo heart models, reducing infarct size and improving cardiac function. Mechanisms include PI3K/Akt activation and mitochondrial protection. South African preclinical cardiology research has established this as one of aspalathin’s most consistent activities. Claim strength: Moderate.

Antioxidant: Aspalathin is the primary contributor to rooibos’ antioxidant capacity in the green (unfermented) form. Human supplementation studies with rooibos tea show increases in plasma antioxidant capacity and reductions in lipid peroxidation markers. Claim strength: Moderate.

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Dosage & Formulator Specification

Green rooibos extract clinical and preclinical contexts: 200–500 mg/day standardised green rooibos extract (minimum 5–15% aspalathin by HPLC) for antioxidant and metabolic applications. South African rooibos RCTs typically use 6 cups/day of rooibos tea (approximately 200 mg aspalathin equivalent), which establishes a reference point for oral exposure.

Specify green (unfermented) rooibos extract with HPLC-verified aspalathin content. Fermented (red) rooibos extracts contain significantly lower aspalathin (partially oxidised during fermentation) and are not appropriate for aspalathin-targeted formulations. Some suppliers offer aspalathin-enriched fractions at 20–40% aspalathin content for higher-potency applications.

Aspalathin as a C-glycoside has better aqueous solubility than most aglycone dihydrochalcones. The C-glycoside bond is resistant to acid hydrolysis, preserving aspalathin through gastric passage. Stable under standard manufacturing conditions; light-sensitive extracts require opaque packaging.

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Frequently Asked Questions — Aspalathin

Why does rooibos type matter for aspalathin content?
Fermentation (oxidation) of rooibos is the process that converts the characteristic green colour to the familiar reddish-brown of conventional rooibos tea. During fermentation, aspalathin is partially oxidised and degraded to nothofagin (a related but less potent dihydrochalcone) and other oxidation products. Green rooibos (dried without fermentation) retains approximately 10-fold higher aspalathin content than fermented rooibos. For therapeutic aspalathin applications, always specify green rooibos extract.

Is aspalathin found in any plant other than rooibos?
Aspalathin is essentially unique to Aspalathus linearis — it has not been identified at meaningful concentrations in any other commercial botanical. This makes rooibos the exclusive commercial source, with aspalathin serving as a genuine chemical marker of authentic rooibos material.

Can aspalathin be positioned as a natural AMPK activator for sports nutrition?
The AMPK activation mechanism documented for aspalathin in muscle cell models supports its inclusion in metabolic and sports nutrition formulations targeting insulin-independent glucose uptake and mitochondrial biogenesis. Position as “studied to support healthy glucose metabolism and energy utilisation”. The evidence base is preclinical-dominant; human sports performance data are not available.

Is rooibos extract caffeine-free?
Yes — rooibos is naturally caffeine-free, unlike green tea and other polyphenol sources. This is a practical formulation advantage for stimulant-free antioxidant and metabolic blends, particularly for evening use products or caffeine-sensitive consumer segments.

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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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