Nutrition Care St Mary's Thistle 1:1 is a practitioner-only, alcohol-free liquid herbal extract prepared from the fruit (seed) of Silybum marianum at a 1:1 extraction ratio. Traditionally used in Western Herbal Medicine, St Mary's Thistle supports healthy liver function, assists the body's natural detoxification processes, and helps protect liver cells from oxidative stress. The alcohol-free, glycerol-free formula provides convenient practitioner-grade liver support.