Milk thistle is a galactagogue meaning that it promotes or increases lactation. Like other galactagogues, including fennel, fenugreek, and ginger, milk thistle signals the body to increase milk output particularly when paired with more frequent nursing/pumping. Milk thistle is typically paired with fenugreek as there is some evidence they work best together. Many women who supplement with lactation boosting herbs are pleased with the results and feel more confident in their milk supply.