Elderberry
Sambucus nigra (Elderberry)
Elderberry (Sambucus nigra) is a fruit-derived supplement used primarily for immune support, particularly for reducing the duration and severity of upper respiratory infections including colds and influenza. It is rich in anthocyanins, flavonoids, and polyphenols, and has been studied in multiple randomized controlled trials for antiviral and immunomodulatory effects.
Mechanism of Action
Elderberry's anthocyanins, particularly cyanidin-3-glucoside and cyanidin-3-sambubioside, inhibit viral attachment and replication by binding to and blocking H1N1 and other influenza hemagglutinin proteins, preventing cellular entry. These polyphenols also stimulate cytokine production (including IL-1β, IL-6, IL-8, and TNF-α) from monocytes and dendritic cells, enhancing innate immune responses. Additionally, elderberry exhibits antioxidant activity by scavenging reactive oxygen species and may reduce inflammation through inhibition of NF-κB signaling.
Evidence by Health Goal(16 goals)
Dosing Protocols
With or without food; consistency preferred
Cycle: Acute use: 5-7 days maximum; preventive use: up to 12 weeks with breaks
Standardized extracts should specify anthocyanin content (typically 3.2-5%). Raw or unripe elderberries are toxic and must not be consumed. Lozenges and gummies are available but provide lower standardized anthocyanin content.
Safety & Side Effects
Elderberry standardized extracts are generally well-tolerated for short-term use (up to 12 weeks) in healthy adults. Caution is warranted in individuals with autoimmune diseases or those on immunosuppressant therapy, as its immune-stimulating properties could theoretically exacerbate these conditions.
Possible Side Effects
- !Gastrointestinal discomfort including nausea and diarrhea at high doses
- !Vomiting if unripe or raw berries are ingested (due to sambunigrin)
- !Allergic reactions in individuals sensitive to plants in the Adoxaceae family
- !Potential overstimulation of the immune system with prolonged use (cytokine upregulation)
- !Mild diuretic effect reported anecdotally
- !Headache in rare cases
Interactions
- -May reduce efficacy of immunosuppressant drugs (cyclosporine, tacrolimus, corticosteroids) by counteracting immune suppression
- -Potential additive effect with diuretics, increasing fluid loss
- -May enhance hypoglycemic effects of insulin or oral antidiabetic medications due to modest blood glucose-lowering properties
- -Additive antioxidant and antiplatelet effects possible when combined with blood-thinning supplements (fish oil, vitamin E, ginkgo)
- -May interact with chemotherapy agents due to antioxidant activity potentially interfering with oxidative mechanisms of some cancer drugs
Cost & Where to Buy
Standardized capsule or tablet extracts are the most affordable option; branded syrups (e.g., Sambucol, Nature's Way) tend to cost more. Price varies significantly by anthocyanin standardization, form (syrup vs. capsule), and brand reputation.
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