Q. I'm a 39-year-old woman in need of an herb that can decrease sex drive. I think you've written about this before, but I can't recall the herb you suggested. I'm in excellent health, taking only Flonase, Ortho Tri-Cyclen and an occasional Advil.
A. In the past, we asked herb expert James Duke, Ph.D., who suggested an extract of chaste-tree berry (Vitex agnus-castus). Vitex has a progesterone-like effect.
As you might guess from the name, folklore holds that these berries, once called "monks' pepper," can lower libido. Although there is no science to support this belief, progesterone can interfere with normal sex drive. Please check with your doctor before adding this hormone-like herb to your birth control pills.