NutriStack
Elderberry and Oseltamivir, a synergy.
Elderberry (Sambucus nigra) flavonoids inhibit influenza H1N1 attachment in vitro and small randomized trials suggest modest reductions in influenza duration and severity. A 2021 systematic review found no evidence of immune over-stimulation or cytokine storm risk, and there is no known pharmacokinetic interaction with oseltamivir, making the combination a reasonable adjunct during acute influenza.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Elderberry and Oseltamivir
- Pair type
- Synergy
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Emerging evidence
Synergy
What is happening. Elderberry (Sambucus nigra) flavonoids inhibit influenza H1N1 attachment in vitro and small randomized trials suggest modest reductions in influenza duration and severity. A 2021 systematic review found no evidence of immune over-stimulation or cytokine storm risk, and there is no known pharmacokinetic interaction with oseltamivir, making the combination a reasonable adjunct during acute influenza.
Mechanism. Elderberry flavonoids bind to and block influenza A H1N1 hemagglutinin, preventing viral attachment to host cells. Oseltamivir blocks viral neuraminidase, preventing release of new virions. The mechanisms target different steps of the viral life cycle.
Recommendation. Standardized elderberry extract (e.g., 175-300 mg/day or label dose) may be used alongside oseltamivir for acute influenza in healthy adults. Start within 48 hours of symptom onset; do not use elderberry instead of oseltamivir.
Sources (2)
- Roschek B Jr, et al. Elderberry flavonoids bind to and prevent H1N1 infection in vitro. Phytochemistry. 2009;70(10):1255-61. PMID 19682714
- Wieland LS, et al. Elderberry for prevention and treatment of viral respiratory illnesses: a systematic review. BMC Complement Med Ther. 2021;21(1):112. PMID 33827515
Stack Score
How this pair moves the number.
Effect on the composite score
If both Elderberry and Oseltamivir are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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