Does yarrow help with gastrointestinal function?

A study that included yarrow as a component of a multi-herb capsule (in combination with Boswellia and ginger) for irritable bowel syndrome found that, when this combination was taken once every 8 hours over a month, male participants saw statistically significant improvements in quality-of-life scores; however, overall reductions in average symptom severity, anxiety, and depression scores were not strong enough to recommend yarrow for this condition.^[1] Beyond this, only preclinical evidence exists to suggest that achilleas (A. Millefolium and A. nobilis) administered to rats could aid in reducing both peptic ulcers^[2] and stomach cramping.^[3][4] Again, clinical studies are needed before these results may be translated to human use.