Immunity/Inflammation

Elderberry

Dark purple berry extract used to reduce severity and duration of common cold and flu symptoms, most beneficial during seasonal illness exposure.

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Quick Take

Worth trying at the first sign of a cold; evidence is promising but not definitive, and it won't prevent infection.

Elderberry is the fruit of the Sambucus nigra plant, rich in anthocyanins and flavonoids. Supplements typically use standardized extracts or syrups made from the berries. Its primary proposed mechanism involves modulating immune responses and interfering with viral entry. Randomized trials suggest it can lessen the severity and shorten the duration of upper respiratory symptoms when taken early in illness. People most likely to benefit are those exposed to seasonal viruses or seeking adjunct symptom relief during acute colds or influenza.

Potential benefits

Reduces cold and flu symptoms

May lower inflammatory markers

May reduce oxidative stress

Protocol

Amount

500-1000 mg

Frequency

2-3 times daily during illness; once daily off-season

When

At the first sign of illness; take with food to minimize stomach upset.

Onset Time

2-4 days for symptom relief when taken at onset of illness; not for prevention.

Who Should Consider

Adults during cold and flu season

People with frequent upper respiratory infections

Those seeking adjunct symptom relief

Air travelers during high-exposure periods

How It Works

Elderberry flavonoids, particularly anthocyanins, may interfere with viral hemagglutinin and neuraminidase activity, limiting viral entry and replication. The extract also appears to modulate cytokine production, potentially upregulating beneficial immune responses while tempering excessive inflammation.

Updated 5/19/2026