Researchers at Victoria University, St. Albans, Victoria, Australia gave fourteen postmenopausal women 3.5 grams a day of maca for 6 weeks and compared them to a group receiving placebo pills. No differences were seen in blood concentrations of estradiol, follicle-stimulating hormone, luteinizing hormone, and sex hormone-binding globulin between maca treatment and placebo. The women who received the maca pills had a significant reduction in anxiety and depression and had improved sexual function. The researchers conclude, "Preliminary findings show that maca reduces psychological symptoms, including anxiety and depression, and lowers measures of sexual dysfunction in postmenopausal women independent of estrogenic and androgenic activity."
   My comments: Maca is an interesting herb that grows in the Andes mountains in Peru and other other countries in South America. Even though this study used 3.5 grams (3500 milligrams) a day, I would suggest using less, such as 500 to 2000 mg a day if you plan to take the herb for long term use. See
   I like maca herb. I have personally noticed more energy, improved wellbeing, and mild sexual enhancement after a few days of maca use. There are more potent herbs than maca in terms of sexual enhancement including tongkat ali, mucuna pruriens, tribulus, muira puama, the combination formula Passion Rx, and others. They all work in men and women. See