Science Supplements ProKalm For Horses & Ponies - 1.1kg - Manages stress & anxiety in horses - Allows them to perform at their potential - Supported by independent clinical studies Fast acting and effective calming supplement with results in as little as 30 minutes from feeding. An innovation in managing stress and anxiety in horses allowing them to perform at their potential, and supported by two independent clinical studies. A unique combination of herb extracts and amino acids and does not contain valerian, magnesium or tryptophan.