Benefits
Upper respiratory symptom comfort studied in multi-herb formulas
In randomized trials in people with sinus symptoms, a five-plant tablet known as Sinupret extract eased nasal and facial symptoms more than placebo over about two weeks, and a children's version reduced runny nose and antibiotic use. Elder flower is one of five herbs in these products, so the effect cannot be credited to the flower by itself.
Traditional tea use for cough and nasal congestion
Elder flower has a long folk history as a warm tea taken at the first sign of a cold and to encourage sweating. European traditional-use guidance recognizes flower preparations for the relief of early cold symptoms, but notes this rests on long-standing use rather than clinical trials of the flower.
Flavonoids with antioxidant activity in laboratory tests
The flowers contain flavonoids, chiefly rutin, and other polyphenols that register antioxidant activity in laboratory assays, and the amount of these compounds changes with where the plants grow. Laboratory antioxidant readings do not show an effect on oxidative stress in people.
Anti-inflammatory activity in laboratory and animal studies
In mice, an aqueous extract of the flowers lowered the movement of neutrophils into inflamed tissue and reduced the inflammatory messengers TNF, IL-1 beta and IL-6. In cell studies the extract also raised the calming signal IL-10. These are animal and cell findings and have not been confirmed as health outcomes in people.
Multi-herb cold formula studied in cell cultures
In cell studies, the five-plant Sinupret formula slowed several viruses that cause upper respiratory infections, including influenza, rhinovirus and respiratory syncytial virus. This tested the multi-herb product in the laboratory, not elder flower alone, and is not evidence of an effect in people.
Mechanism of action
Flavonoids act as antioxidants
The flowers are rich in flavonoids such as rutin. In laboratory work these polyphenols neutralize reactive oxygen species and can dampen inflammatory signaling. This is the proposed basis for the plant's traditional use, shown so far mainly in cell and animal models.
Studied as part of a secretolytic herbal combination
Elder flower is one component of multi-herb sinus products. In cell and tissue studies the finished Sinupret formula increased chloride movement and fluid across airway lining cells and sped up the cilia, changes thought to help clear mucus. These are laboratory measures, and the flower's own contribution was not isolated.
Promotes sweating in traditional use
Elder flower tea is traditionally drunk hot to encourage sweating during a cold, which is the basis of its old reputation as a diaphoretic. This is a traditional rationale rather than a mechanism confirmed in controlled human studies.
Clinical trials
Randomized, placebo-controlled trial of a dry extract of five herbal drugs (BNO 1016, Sinupret extract), which includes elder flower, taken for 15 days (Jund et al. 2012, Rhinology).
Patients with acute viral rhinosinusitis of up to three days with a major symptom score of 8 to 12, treated with the five-herb dry extract or placebo.
The herbal tablet lowered the mean major symptom score significantly more than placebo and brought symptom relief about two days earlier, with a number needed to treat of 8 for healing and better responder rates at days 10 and 14. It was well tolerated. Elder flower is one of five herbs, so the effect is not attributable to the flower alone.
Pooled efficacy analysis of two similar randomized, placebo-controlled trials of the five-herb extract BNO 1016 at 480 mg a day for 15 days (Jund et al. 2015, Acta Otolaryngol).
589 adults with acute viral rhinosinusitis; 294 took the five-herb extract and 295 took placebo.
The major symptom score fell to a mean of 2.47 with the herbal extract versus 3.63 with placebo, a significant difference, and patient-rated quality of life also favored the extract. The product is a five-herb combination, so the result reflects the whole formula rather than elder flower by itself.
Randomized, placebo-controlled trial of two doses of the five-herb extract BNO 1016 (Sinupret extract) over 12 weeks (Palm et al. 2017, Rhinology).
929 adults with chronic rhinosinusitis given one of two doses of the five-herb extract or placebo.
The main symptom-score endpoint was not significantly better than placebo. Secondary measures trended in favor of the extract, and a post hoc subgroup whose disease was specialist-diagnosed and had lasted over a year did improve. It was well tolerated. The result is for the multi-herb product, and the primary outcome was negative.
Open-label, multicenter, randomized comparative study of the five-plant extract BNO 1012 added to standard symptomatic care (Popovych et al. 2020, Am J Otolaryngol).
292 children aged 6 to 11 with acute viral or post-viral rhinosinusitis, given the five-plant extract plus standard symptomatic care or standard care alone.
Adding the five-plant extract reduced runny nose, nasal congestion and post-nasal drip faster than standard care alone, giving about a three-day advantage in the first week, and cut antibiotic prescriptions roughly in half. The study was open-label and tested the combination product, not elder flower alone.