Question: is agnus castus and vitex the same thing?
Answer: Vitex agnus-castus is the most common vitex used medicinally. The Vitex agnus-castus fruit, also known as chasteberry or monk's pepper, is about the size of a peppercorn. It's produced by the chaste tree, which acquired its name because its fruit was likely used to decrease men's libido during the Middle Ages ( 2 ).