Cranberry extract suppresses interleukin-8 secretion from stomach cells stimulated by Helicobacter pylori in every clinically separated strain but inhibits growth in part of the strains

► Cranberry had been shown to inhibit two standard strains of Helicobacter pylori (HP). ► We examined growth inhibition by cranberry using clinically separated HP strains. ► We also examined suppression of IL-8 secretion by cranberry using the strains. ► Cranberry suppressed IL-8 secretion in all the strains, but inhibited growth in part of them. ► Cranberry may suppress chronic gastritis, which closely relates with gastric cancer.