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ingestible · for immune support

Elderberry Extract (Sambucus nigra)

Reviewed by the Nimbera editorial team · Last updated May 2026

Zakay-Rones et al. (2004, J Int Med Res, PMID 15080016) conducted a double-blind, placebo-controlled RCT (n=60, ages 18-54) during the 1999-2000 influenza season. Participants receiving 15 ml elderberry syrup four times daily for 5 days recovered on average 4 days earlier than placebo, with significantly less rescue medication use.$15-$35 per bottle (1-2 weeks of treatment-dose use).

How to use

Take 15 ml of standardised elderberry syrup (Sambucol or equivalent) four times daily at the first sign of flu-like symptoms, for up to 5 days. Some people take 5-10 ml daily as a seasonal preventive measure, though evidence for prevention is weaker.

How it works

Sambucus nigra anthocyanins and flavonoids appear to inhibit influenza virus haemagglutinin, reducing the virus's ability to bind and enter host cells. They also stimulate cytokine production, including interleukins that activate the innate immune response.

Where to buy

Health food stores and pharmacies. Look for standardised extracts (Sambucol is the form studied). Avoid raw elderberries, which can cause nausea.

Typical cost: $15-$35 per bottle (1-2 weeks of treatment-dose use).

Safety notes

Not recommended during pregnancy or breastfeeding due to insufficient safety data. Those on immunosuppressant medications should consult a doctor, as elderberry may stimulate immune activity. Theoretical concern exists about elderberry worsening cytokine storms in severe influenza - stop use and seek care if symptoms worsen rapidly.

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

Zakay-Rones Z et al., Randomized study of the efficacy and safety of oral elderberry extract in the treatment of influenza A and B virus infections, J Int Med Res, 2004

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.