Galangin (Flavonol · Antimicrobial · Antiviral)
| Compound | Galangin |
| Chemical class | Polyphenol — Flavonol (3,5,7-Trihydroxyflavone) |
| CAS | 548-83-4 |
| Primary source | Alpinia officinarum (lesser galangal rhizome) |
| Key applications | Antimicrobial, antiviral, anti-inflammatory |
| Claim strength | Moderate |
| Typical form | Galangal extract standardised to galangin content |
Name origin: Derived from Alpinia galanga / officinarum (galangal), a rhizomatous plant of the Zingiberaceae family widely used across South and Southeast Asia. Traditional use: Galangal rhizome has been employed in Ayurveda and Traditional Chinese Medicine (as Gao Liang Jiang) for digestive complaints, respiratory infections, and as an antimicrobial spice. Galangin is one of the principal bioactive flavonols responsible for these activities. Research trajectory: Preclinical literature is substantial, covering antiviral (HSV, influenza), antibacterial, and anti-inflammatory mechanisms. Clinical evidence for isolated galangin is limited; human data derives from galangal extract studies. Commercial source: Available from Alpinia officinarum rhizome extracts; Herbuno supplies both water-soluble and oil-soluble galangal extracts.
Evidence for Galangin Applications
Antiviral activity: In vitro studies demonstrate galangin inhibits replication of herpes simplex virus (HSV-1, HSV-2), influenza A, and enterovirus by interfering with viral protease activity and membrane fusion. Inhibitory concentrations are in the low micromolar range. Claim strength: Moderate.
Antimicrobial and anti-biofilm activity: Galangin exhibits MIC values of 32–128 µg/mL against Staphylococcus aureus (including MRSA), E. coli, and Candida albicans. Biofilm inhibition at sub-MIC concentrations is documented. Useful as a botanical antimicrobial co-ingredient in topical or oral health formulations. Claim strength: Moderate.
Anti-inflammatory signalling: Galangin suppresses NF-κB activation, reducing pro-inflammatory cytokine production (TNF-α, IL-6, IL-1β) in macrophage and chondrocyte models. Relevant for joint health and inflammation-management blends. Claim strength: Emerging.
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Dosage & Formulator Specification
Galangin is not widely available as a pharmaceutical-grade isolate. Commercial sourcing relies on standardised galangal rhizome extract. Typical specifications: 5–20% total flavonoids (UV), with galangin as the principal marker. HPLC confirmation of galangin content is advisable for premium formulations.
Dose ranges used in preclinical and traditional contexts translate to approximately 200–500 mg/day of a standardised galangal extract (10% flavonoids), delivered in 2–3 divided doses. For antimicrobial oral health applications (lozenges, chewing gum), 50–100 mg per unit with verified bioavailability enhancement is appropriate.
Galangin has moderate lipophilicity (logP ~2.8); oil-soluble galangal extract offers better bioavailability in lipid-based delivery formats. Thermostability is good to 80°C, suitable for soft-gel manufacturing without degradation.
Frequently Asked Questions — Galangin
Is galangin the same as galangal extract?
No. Galangin is the primary flavonol in galangal rhizome, but galangal extract also contains kaempferide, alpinetin, and essential oils (1,8-cineole, methyl cinnamate). Full-spectrum extract provides synergistic effects not replicated by galangin alone.
What is the preferred extraction solvent for galangin-rich galangal?
Ethanol (50–70%) is the preferred solvent for flavonoid-rich galangal extract. Supercritical CO₂ extraction enriches essential oil fractions rather than flavonoids. For water-soluble formats, specify Herbuno’s water-soluble galangal extract.
Can galangin be used in topical formulations?
Yes. Given its antimicrobial and anti-inflammatory profile, galangin-containing galangal extract is suitable for topical antimicrobial and skin-calming formulations. Typical inclusion at 0.1–0.5% galangin equivalent in emulsion bases.
What regulatory status does galangin-containing galangal extract carry?
Galangal is a recognised food spice with GRAS status in the US and listed in EU flavouring regulations. As a standardised extract in supplements, it is typically regulated as a botanical ingredient. Isolated galangin does not carry separate GRAS or Novel Food status in most markets.
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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