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ingestible · for cold & flu symptom relief

Elderberry Syrup

Reviewed by the Nimbera editorial team · Last updated May 2026

A 2021 systematic review of 5 RCTs found elderberry may reduce influenza and cold duration and severity, but certainty of evidence is low to moderate due to small sample sizes and methodological limitations. A 2004 RCT (n=60) found elderberry syrup reduced influenza duration by approximately 4 days vs placebo.$15-$30 for a 4 oz bottle

How to use

For adults, take 1 tablespoon (15 ml) of standardized elderberry syrup 3-4 times daily at the first sign of cold or flu symptoms. Most commercial preparations are standardized to contain Sambucus nigra berry extract. Use for up to 5 days during acute illness. Elderberry gummies and capsules are available but syrup formulations are most studied.

How it works

Elderberries (Sambucus nigra) contain flavonoids - particularly cyanidin-3-glucoside and cyanidin-3-sambubioside - that may inhibit viral attachment to host cell receptors and stimulate cytokine production. Some research suggests these compounds bind directly to influenza virions and block replication.

Where to buy

Health food stores, pharmacies, and online. Common brands include Sambucol, Nature's Way Sambucus, and Gaia Herbs. Look for products standardized to Sambucus nigra extract.

Typical cost: $15-$30 for a 4 oz bottle

Safety notes

Raw or unripe elderberries contain sambunigrin, a cyanogenic glycoside - only use commercially processed products. Theoretical concern that elderberry may overstimulate the immune system exists, but the 2021 systematic review found no supporting evidence. People taking immunosuppressant medications (cyclosporine, tacrolimus, corticosteroids, azathioprine) should consult their physician before use. Not well-studied in pregnancy.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Wieland LS et al. Elderberry for prevention and treatment of viral respiratory illnesses. BMC Complement Med Ther. 2021.

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.