Kombucha: real health benefits or marketing hype?

An eight-week double-blind randomized trial in 40 healthy adults found that daily kombucha led to measurable health-related biomarkers in blood and urine, but did not affect stress responses; results vary with fermentation conditions and product composition. The researchers, backed by Innovate UK and a North Wales company, aim to refine kombucha’s active compounds, while stressing that kombucha should complement—not replace—a balanced diet and that commercially available drinks differ widely.