Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Elderberry (Sambucus nigra) is a European fruit rich in anthocyanins and flavonoids that inhibits viral replication and modulates immune responses. Clinical studies demonstrate it reduces influenza symptom duration by approximately 50% when taken within 48 hours of onset.
Origin & History
Sambucus nigra, commonly known as black elderberry, is a deciduous shrub native to Europe, North Africa, and parts of Asia. The dark purple-black berries are harvested ripe and processed via water or ethanol extraction to produce syrups, powders, or standardized extracts rich in anthocyanins and flavonoids.
Research Narrative (Provisional)
Five clinical trials involving 936 adults demonstrated Sambucus nigra's efficacy for respiratory infections, with the landmark Zakay-Rones 2004 study (PMID 15080016) showing symptom improvement in 3.1 days versus 7.1 days with placebo. A 2020 rapid review (PMID 32864330) and meta-analysis (PMID 30670267) confirmed benefits for upper respiratory symptoms, though one outpatient RCT (PMID 32929634) found no benefit for influenza duration.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
Sambucus nigra (European Elderberry) berries contain per 100g fresh weight: Carbohydrates 11.4g (primarily glucose and fructose), Protein 0.66g, Fat 0.5g, Dietary fiber 7g. Key micronutrients include Vitamin C 36mg (40% DV), Vitamin B6 0.23mg, Iron 1.6mg, Potassium 280mg, Calcium 38mg, Phosphorus 39mg. Primary bioactive compounds include Anthocyanins (predominately cyanidin-3-glucoside and cyanidin-3-sambubioside) at 200-1000mg/100g fresh weight depending on cultivar and ripeness — these are the principal immunomodulatory agents linked to antiviral activity. Flavonoids include quercetin (~5-7mg/100g), rutin, kaempferol, and isorhamnetin. Phenolic acids include chlorogenic acid (~96mg/100g) and caffeic acid. Elderberries also contain lectins (SNA-I, SNA-II) and Sambucus nigra agglutinins that may inhibit viral hemagglutinin. Bioavailability notes: Anthocyanin bioavailability is relatively low (1-5% absorption) but is enhanced by gut microbiota metabolism into bioactive phenolic metabolites. Quercetin bioavailability improves in glycoside form. Raw berries contain sambunigrin (a cyanogenic glycoside) at ~3mg/100g which is effectively neutralized by cooking or commercial processing. Polyphenol content varies significantly by ripeness, cultivar, and processing method; standardized extracts typically deliver 12.5-15% anthocyanins by dry weight.
Reported Mechanism (Provisional)
Elderberry's anthocyanins (cyanidin-3-glucoside, cyanidin-3-sambubioside) bind to H1N1 influenza virus proteins, blocking viral attachment and entry into host cells. The flavonoids quercetin and rutin enhance immune function by increasing cytokine production and T-cell activity. Additionally, elderberry compounds inhibit neuraminidase enzyme activity, preventing viral spread between cells.
Clinical Narrative (Provisional)
Five randomized controlled trials (n=936) demonstrate elderberry extract reduces influenza and cold symptom duration by approximately 50% when initiated within 48 hours of symptom onset. A notable RCT by Zakay-Rones (1995) showed fever resolution in 2.36 days versus 3.33 days with placebo. Most studies used standardized elderberry extract at 15ml four times daily for adults. Evidence strength is considered moderate to strong for respiratory viral infections but limited for other conditions.
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