Elderberry Benefits: What the Research Actually Shows

Elderberry occupies an unusual position. It has more supportive clinical evidence than most herbs in the wellness aisle — and it's also the herb that triggered federal enforcement action for overclaiming.

Both things are true, and the gap between them is where nearly all elderberry marketing lives.

Here's what the trials actually found, including the finding most brands leave out.

What the NIH Says

The National Center for Complementary and Integrative Health sets the frame: a small number of studies have evaluated elderberry for colds, flu, and other upper respiratory infections, and little research has been done in people on any other use.

Its conclusion is that some preliminary research suggests elderberry may relieve symptoms of flu, colds, or other upper respiratory infections, and that there's not enough information to show whether it's helpful for any other health purpose.

"May relieve symptoms." Not prevent, not cure, not treat.

The Air-Travel Trial: The Most Interesting Result

The single most informative study is Tiralongo and colleagues' 2016 randomized, double-blind, placebo-controlled trial published in Nutrients, which enrolled 312 economy-class passengers flying from Australia overseas. Participants took a standardized membrane-filtered elderberry extract before, during, and after travel.

The results split in a way that deserves careful reading.

On catching a cold: no significant effect. Seventeen people in the placebo group developed a cold, compared with twelve in the elderberry group. The researchers reported this difference as not statistically significant (p = 0.4).

On how long colds lasted: significant. The placebo group accumulated 117 cold-episode days against the elderberry group's 57 (p = 0.02).

On how bad they were: significant. Average symptom scores over those days were 583 for placebo versus 247 for elderberry (p = 0.05).

So among people who got sick, elderberry appeared to shorten and soften the illness. It did not measurably stop people getting sick in the first place.

That distinction matters enormously, because "immune support" marketing implies prevention, and prevention is exactly what this trial failed to demonstrate. The authors themselves concluded more research is warranted to confirm the effect.

The Meta-Analysis

Hawkins and colleagues published a 2019 meta-analysis in Complementary Therapies in Medicine concluding that black elderberry supplementation substantially reduces upper respiratory symptoms. NCCIH lists it among its key references.

Two caveats belong alongside that headline.

The evidence base is small. The analysis pooled four randomized controlled trials totaling roughly 180 participants. That's a modest foundation for a category this large, and the included studies were heterogeneous in design and preparation.

The influenza-versus-cold split is fragile. The researchers found elderberry more effective against influenza symptoms than common cold symptoms — but noted that only one of the included studies involved common cold subjects, so the comparison should be interpreted cautiously.

A broader 2021 systematic review by Wieland and colleagues in BMC Complementary Medicine and Therapies examined elderberry for prevention and treatment of viral respiratory illnesses and reached similarly measured conclusions.

The COVID-19 Problem

This is the part of elderberry's story that no other herb in the cabinet shares, and it's worth stating plainly.

NCCIH reports that the FDA and the Federal Trade Commission have taken action against companies that marketed elderberry products with unsubstantiated claims of effectiveness for COVID-19. Its guidance is explicit: don't rely on elderberry for prevention or treatment of COVID-19, because there is insufficient evidence to know if it can help with symptoms.

Elderberry sales surged during the pandemic on claims the evidence never supported. The regulators noticed.

We're including this because it's the clearest available illustration of the boundary. Elderberry has real preliminary evidence for upper respiratory symptom relief. It does not have evidence for treating a specific viral disease, and companies that said otherwise received warning letters.

Why the Evidence Is Thinner Than It Looks

Several structural issues limit what can be concluded.

Small sample sizes. Four trials, 180 people, in the central meta-analysis.

Preparation variability. Trials used standardized extracts — membrane-filtered, characterized products at controlled doses. Commercial elderberry ranges from syrups to gummies to teas at wildly different concentrations. A finding about a standardized capsule is not a finding about a cup of tea.

Heterogeneous designs. Different populations, dosing schedules, and outcome measures make pooling difficult.

Subjective endpoints. Symptom scores are self-reported, which is legitimate but noisier than an objective marker.

Industry involvement. As with much supplement research, several trials in this space were conducted with manufacturer support. That doesn't invalidate findings, but it's a known source of bias worth naming.

Population-Specific Notes

Pregnancy and breastfeeding. NCCIH states little is known about whether elderberry is safe during either. No data exist on excretion of elderberry components into breastmilk.

People on medication. NCCIH advises talking to a healthcare provider before using elderberry if you take any medicine, since herbs and medications can interact harmfully.

People with autoimmune conditions. Elderberry is widely promoted for immune stimulation. If you have an autoimmune condition or take immunosuppressants, this is a conversation to have with your provider before starting.

Children. Trials have been conducted in children, but dosing isn't well established and the overall evidence base is limited. Check with a pediatrician.

Anyone consuming it raw. No amount of research changes the fact that raw elderberries and other parts of the plant contain cyanide-producing compounds. Cooking eliminates them.

Key Takeaways

• The best trial evidence supports reduced duration and severity of upper respiratory illness — roughly halving cold-episode days in the air-travel study.
• That same trial found no significant reduction in whether people got sick at all.
• The central meta-analysis rests on four trials and about 180 participants.
• Effects looked stronger for influenza than for the common cold, but that comparison came from limited data.
• NCCIH's position is that a small number of studies support that elderberry may relieve symptoms — nothing beyond that.
• FDA and FTC have taken enforcement action over COVID-19 claims. Elderberry is not a COVID treatment.
• Nearly all positive findings used standardized extracts, not tea or homemade syrup.

What This Means If You Drink It

Elderberry is a tart, deeply pigmented, genuinely pleasant botanical with centuries of European household use and a small but real body of clinical work behind it. If you catch something and reach for elderberry syrup, the evidence suggests you may feel better sooner than you otherwise would.

What it isn't is a shield. The best-designed trial available couldn't show it stopped people getting sick. And it is emphatically not an antiviral treatment for any named disease.

We'd rather sell you an honest cup than an overclaimed one — partly because it's right, and partly because this is the one category where the federal government has already demonstrated it's paying attention.

Frequently Asked Questions

Does elderberry prevent colds?

The evidence doesn't show that. In a trial of 312 air travelers, 12 people taking elderberry caught colds versus 17 on placebo — a difference the researchers reported as not statistically significant.

Does elderberry shorten colds?

That's the better-supported claim. In the same trial, cold-episode days totaled 57 in the elderberry group versus 117 on placebo, and symptom scores were roughly half. A 2019 meta-analysis reached similar conclusions.

Is elderberry effective against flu?

The 2019 meta-analysis found effects appeared more pronounced for influenza than for the common cold — but only one included study involved common cold patients, so that comparison rests on thin data.

Can elderberry treat COVID-19?

No. NCCIH advises against relying on elderberry for COVID-19 prevention or treatment, and the FDA and FTC have taken action against companies making those claims.

How much elderberry do I need to match the studies?

That can't be answered cleanly. Trials used standardized, characterized extracts at controlled doses. There's no established conversion between those and a cup of tea, a spoonful of syrup, or a gummy.

Is elderberry safe to take daily?

Cooked elderberry is well tolerated in trials. Talk to your provider if you're pregnant, nursing, taking medication, or managing an autoimmune condition — and never consume it raw.

Why is elderberry research so limited if it's so popular?

Because popularity and research funding aren't connected. The central meta-analysis pooled about 180 people across four trials, which is small for a product sold at this scale.

Related Reading

• Sambucus nigra vs. Sambucus canadensis: European and American Elder
• Why Elderberries Must Be Cooked
• Echinacea Benefits: What the Research Actually Shows
• Chamomile Benefits: What the Research Actually Shows

Sources

• National Center for Complementary and Integrative Health, National Institutes of Health. Elderberry: Usefulness and Safety. Last updated November 2024.
• Tiralongo E, Wee SS, Lea RA. Elderberry supplementation reduces cold duration and symptoms in air-travellers: a randomized, double-blind placebo-controlled clinical trial. Nutrients. 2016;8(4):182.
• Hawkins J, Baker C, Cherry L, et al. Black elderberry (Sambucus nigra) supplementation effectively treats upper respiratory symptoms: a meta-analysis of randomized, controlled clinical trials. Complementary Therapies in Medicine. 2019;42:361-365.
• Harnett J, Oakes K, Carè J, et al. The effects of Sambucus nigra berry on acute respiratory viral infections: a rapid review of clinical studies. Advances in Integrative Medicine. 2020;7(4):240-246.
• Drugs and Lactation Database (LactMed). Elderberry. National Institute of Child Health and Human Development.

This article is for educational purposes only and is not intended as medical advice. Elderberry is not a treatment or cure for any condition, including COVID-19 or influenza. Never consume raw elderberries or other parts of the elder plant. Talk with your healthcare provider before using elderberry, especially if you are pregnant, nursing, taking medication, or managing an autoimmune condition.