The seeds of Milk Thistle have been used to support the growth of new liver cells and aid in the health of the liver, kidneys, and other digestive organs.
I have read conflicting information about the benefits and dangers to horses who eat thistle. Most horses love to eat the flower heads off late spring milk thistle plants. The thorns of the plant are most unforgiving but horses gingerly bite the heads off, chew, swallow and then eat every other mature thistle flower in sight as well. Their behavior leads me to believe they consider it somewhat of a delicacy, like a delicious cookie.