Elder Flower (Sambucus nigra)

Elder flower (Sambucus nigra) contains quercetin at approximately 1,888 µg/g extract, a flavonoid that modulates antioxidant enzyme activity and inflammatory signaling pathways. Clinical evidence for human health benefits remains absent, with current support limited to traditional respiratory use and theoretical activity based on phytochemical composition.

Origin & History

Elder flower derives from Sambucus nigra L., a flowering plant native to Europe and North America in the Adoxaceae family. The flowers are harvested from the shrub and typically extracted using aqueous methods like hot water infusion at 90°C, yielding hydrophilic fractions rich in phenolics and lipophilic fractions via solvent partitioning.

Historical & Cultural Context

Elder flower has historical use in European traditional medicine as a native European and North American herb. However, specific traditional applications, duration of use, or targeted health conditions are not detailed in the available research.

Health Benefits

• No clinical health benefits documented - research focuses only on chemical composition
• Traditional use suggests respiratory support (evidence quality: traditional only)
• Contains quercetin (1,888 µg/g extract) and other flavonoids with potential antioxidant properties (evidence quality: theoretical based on compounds)
• Rich in phenolic acids like caffeoylquinic acid (9,146 µg/g flower) with possible anti-inflammatory potential (evidence quality: theoretical)
• Contains volatile monoterpenes including linalool oxide (up to 87% in fresh flowers) with potential aromatherapeutic properties (evidence quality: theoretical)

How It Works

Quercetin, the primary flavonoid in elder flower at ~1,888 µg/g extract, inhibits pro-inflammatory enzymes including COX-2 and lipoxygenase while modulating NF-κB signaling pathways that regulate cytokine production. Additional flavonoids and phenolic acids in the extract may upregulate endogenous antioxidant enzymes such as superoxide dismutase and catalase through Nrf2 pathway activation. These mechanisms remain theoretical for elder flower specifically, as no controlled human trials have confirmed these pathways are activated at doses achieved through typical supplementation.

Scientific Research

No clinical trials, RCTs, or meta-analyses on elder flower (Sambucus nigra flowers) were found in the research dossier. Available studies focus exclusively on chemical composition and extraction methods rather than clinical outcomes or human health effects.

Clinical Summary

No published clinical trials have evaluated elder flower (Sambucus nigra flowers) as an isolated intervention for any health outcome in human subjects. Available evidence is restricted to in vitro analyses confirming the presence of quercetin (~1,888 µg/g extract) and related flavonoids, alongside ethnobotanical records documenting traditional respiratory and diaphoretic use across European folk medicine. Some elderberry (fruit) research exists but cannot be extrapolated to the flower, as phytochemical profiles differ substantially between plant parts. The overall evidence quality for elder flower health claims is rated traditional or theoretical, meaning no quantified efficacy data from randomized controlled trials currently exists.

Nutritional Profile

Elder flowers (Sambucus nigra) are consumed primarily as infusions, extracts, or cordials rather than as a caloric food source, so macronutrient contribution is negligible. Key bioactive compounds and micronutrients include: **Flavonoids:** quercetin (~1,888 µg/g dry extract), kaempferol (~594 µg/g), isorhamnetin (~484 µg/g), and their glycosides including rutin (quercetin-3-O-rutinoside, ~2,100–4,000 µg/g dry flower depending on cultivar). **Phenolic acids:** 5-O-caffeoylquinic acid (chlorogenic acid) is the dominant phenolic acid (~9,146 µg/g dry flower), with smaller amounts of 3-O- and 4-O-caffeoylquinic acid isomers, p-coumaric acid, and caffeic acid. Total phenolic content ranges ~3.5–5.5 g GAE/100 g dry flower. **Triterpenes:** ursolic acid and oleanolic acid present in flower tissue (~0.5–1.2% dry weight). **Essential oil components:** linalool, cis- and trans-rose oxide, hotrienol, and nerol oxide contribute to aroma but are present in trace amounts (<0.1%). **Vitamins:** modest vitamin C content (~28–36 mg/100 g fresh flower), with trace B-vitamins. **Minerals:** potassium (~1,200–1,800 mg/100 g dry), calcium (~700–900 mg/100 g dry), magnesium (~200–350 mg/100 g dry), phosphorus (~300–500 mg/100 g dry), and iron (~8–12 mg/100 g dry), though mineral bioavailability may be reduced by phenolic-mineral binding. **Mucilage and pectin:** small amounts of soluble fiber-like polysaccharides present. **Lectins and cyanogenic glycosides:** sambunigrin is present in trace amounts in flowers (much lower than in bark/leaves) and is largely degraded by heat during traditional preparation. **Bioavailability notes:** Quercetin glycosides (especially rutin) have moderate oral bioavailability (~15–20% absorption), enhanced when consumed with dietary fat; chlorogenic acid is partially hydrolyzed by gut microbiota to caffeic acid, which is then absorbed in the colon. Hot-water infusion extracts approximately 40–60% of total phenolics from dried flowers.

Preparation & Dosage

No clinically studied dosage ranges, forms, or standardization details are available as no human trials have been documented. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Elderberry, Echinacea, Vitamin C, Zinc, Astragalus

Safety & Interactions

Raw or unprocessed elder flower may contain trace cyanogenic glycosides, though concentrations in flowers are substantially lower than in unripe elder berries and leaves, and are generally considered safe in culinary and tea preparations. Individuals taking anticoagulant medications such as warfarin should exercise caution, as quercetin has demonstrated mild platelet aggregation inhibition in in vitro models and could theoretically potentiate bleeding risk. Pregnant and breastfeeding women are advised to avoid medicinal doses of elder flower due to insufficient safety data, although food-level consumption in teas is traditionally considered low-risk. Allergic reactions are possible in individuals sensitive to plants in the Adoxaceae family, and immunomodulatory effects remain uncharacterized in immunocompromised populations.