"Blessed thistle" refers to a type of plant that is believed to have medicinal properties and is considered lucky or sacred in some cultures. Full definition
As for fenugreek, at the hospital they recommanded me to take 3 pills 3 times a day with blessed thistle also 3 pills 3 times a day but I hate pills so after 3 days I stopped and i didn't see any changes (I wasn't smelling like maple syrup though) I've ordered fenugreek tincture and I'll take it religiously. (exclusivepumping.com)
The Milkflow ™ Fenugreek + Blessed Thistle Drink Mix is a great option for women who have trouble swallowing pills. (babydickey.com)