It’s entirely possible that a pill combining yarrow and carrot was designed to enhance erectile function similar to modern day Viagra.
“Yarrow was meant to slow blood coming from a wound, and carrot-as described by Pedanius Dioscorides, a pharmacologist in Rome-was thought to ward off reptiles and aid in conception.”
“Slowing blood” might concentrate blood in the affected organ and the objective of aiding in conception can easily be connected to erectile properties.
And we know that ancient peoples often made a connection between the visual properties of a plant or animal and a therapeutical use for Man.
BEHOLD THE CARROT!
Think about it, how much of a “serving” of veggies are you going to get from a pill?