hi, vitex is supposed to help support the LP and help maintain progesterone (I think... thats how I understand it anyway) and a regular (14-16day) LP length.

This reminded me of a post that deal with this kind stuff...I've linked it... Its about herbs, and vitex is talked about a lot. Have a look, and have a look at the older one too, it is linked in the first post.

Herbal Remedies & Supplements for TTC