I am on it and it is working for me ( I think). I'm still considered 'early' peri sadly, but thinking I'm heading into late peri now. Most of maca is polysaccharides ( sugars) and they believe it to be a potent antioxidant. They are still looking at the bioactive compounds responsible for it's effects on people. There are some studies out...it seems to reduce anxiety/depression, increase sperm count, may reduce menopausal symptoms ( anecdotally I think it does), and may increase calcium and iron. It's supposed effect is not directly on sex steroids ( in other words it won't increase your estrogen), but it acts directly on the hypothalamic pituitary axis which regulates your sex hormones.
Tara