Does elderberry shorten a cold?

The evidence for elderberry shortening a cold is suggestive but not yet established by a high-quality trial or Cochrane review. A few small randomised trials and one meta-analysis (Hawkins 2019, published in Complementary Medicine Research) have found it may reduce cold duration by roughly 1–2 days, but those journals don't meet this site's evidence threshold, so the finding stays in "promising, not proven" territory. The EMA has assessed elderberry (Sambucus nigra fruit) and noted that some data suggest it may reduce flu-like symptoms and duration 1, but it hasn't granted a full "well-established use" authorisation — only traditional use status applies.

In comparison, zinc lozenges have slightly stronger (though still low-certainty) trial evidence — a 2024 Cochrane review of 34 trials found zinc may shorten a cold by about 2.4 days — and vitamin C taken regularly (not after symptoms start) has moderate-certainty Cochrane evidence for shortening colds by about 8% in adults. Elderberry doesn't yet have that tier of evidence behind it.

On safety: elderberry preparations are generally well tolerated. Raw or undercooked berries contain cyanogenic glycosides and can cause nausea or vomiting, so use a properly prepared product 1.