Ginger and the Airways: From Tissue Strips to a Small Asthma Trial

Why ginger keeps coming up for breathing

Ginger has a reputation in many traditions as a warming remedy for colds and chest congestion. Science got to it through a different door: nausea. A review of 109 randomized trials found ginger's most consistent human effects for nausea and vomiting, with some signals for inflammation and metabolic markers^[1]. Interest in ginger for the airways is more recent and comes mostly from one research group at Columbia University.

Step one: airway tissue in a dish

In a 2013 study, researchers took isolated human airway smooth muscle and guinea pig tracheas, made the muscle contract, and then exposed it to ginger extract and to purified ginger compounds. Ginger relaxed the muscle quickly, and three compounds, [6]-gingerol, [8]-gingerol and [6]-shogaol, did so on their own. The effect involved reduced calcium signaling in the muscle cells, and the compounds also enhanced the relaxation produced by a standard bronchodilator drug^[2].

This is mechanistic evidence: it shows ginger compounds can act on airway muscle when they are bathed directly onto it at controlled concentrations.

Step two: animals and cells

In mice sensitized to an allergen to mimic allergic asthma, an ethanol extract of ginger reduced airway inflammation and suppressed the Th2 immune response that drives it^[3]. Separately, fresh ginger reduced respiratory syncytial virus activity in human respiratory cell lines^[4]. Both results are encouraging and both are far removed from a person taking a supplement.

Step three: the 2024 human pilot

The same group then ran a randomized, double-blind, placebo-controlled trial in 32 adults with mild-to-moderate asthma that was not well controlled despite their usual medicines. Participants took 1 g of a ginger dietary supplement twice daily, or placebo, for two months, staying on their regular treatment^[5].

The planned primary outcomes, airway responsiveness to methacholine and exhaled nitric oxide, did not show the hoped-for change, and blood eosinophils were unchanged. Three measures of symptom control, including the Asthma Control Test, improved by day 28 in the ginger group, and two asthma-related cytokines, IL-13 and IL-17A, shifted. The authors called it a first demonstration and asked for larger trials at higher doses in specific asthma types.

That is a genuinely interesting result, and an early one: a small trial, objective airway measures unchanged, symptom scores improved.

How that compares with a ginger-containing spray

The trial dose was 2,000 mg of ginger supplement a day. In Breathizen, ginger is the second of three ingredients in a 154 mg blend. Blend ingredients must be listed in descending order by weight^[9], so ginger can be 77 mg at most per serving, under 4% of the trial's daily amount, and probably less. The trial used capsules swallowed twice a day; the spray is a single 0.60 mL dose, mostly swallowed. Nothing in the pilot tells us what 77 mg or less would do.

Safety notes for ginger supplements

Europe's herbal committee accepts ginger for motion-sickness nausea on well-established use and for common-cold symptoms on traditional use only^[6]. NCCIH notes that ginger is generally well tolerated, with possible abdominal discomfort, heartburn, diarrhea and mouth or throat irritation^[7]. Whether ginger affects platelets in people is uncertain^[8], so people on anticoagulants or antiplatelet drugs, or facing surgery, should ask a pharmacist before taking ginger supplements.

The bottom line

Ginger is a credible candidate for airway research, with a mechanism and one small positive human trial. It is not an asthma treatment, and doses far below the trial's cannot borrow its result. If you have asthma and want to try ginger, discuss it with your clinician as an add-on, keep every prescribed medicine, and judge it by your symptom scores and your action plan, not by a label.

What would settle the question? A larger trial, run for longer, with a standardized ginger extract at a stated gingerol content, objective lung-function and exacerbation outcomes alongside symptom scores, and, ideally, more than one dose so that a dose-response curve can be drawn. Until then, ginger for the airways remains a promising lead rather than an established use, and products that contain a sliver of it are borrowing the lead, not the result.