Hi Karan,
Yes vitex is certainly one of the herbs used to treat luteal phase defect. Other herbs most frequently used in the hormone balancing process in PCOS are peony, licorice, chamaelirium and cimicifuga. It really depends how your symptoms present as to which herbs would be recommended. A really good idea is to have salivary hormone analysis done to get a really good picture of where your hormones are at and then I would go from there. Also lifestyle and dietary changes would help.
I am one of the naturopaths at the new Belly Belly Pregnancy centre in Canterbury. Not sure if you can get there. If you can would love to help.
Jocelyn