I started 800mg of Vitex and 100mg of B6 last cycle and my luteal phase went from 9 days to 11 days so I was really happy about that.
I have noticed thought that it has made me really grouchy. Years ago I was on a progesterone only pill and it sent me crazy with bad moods and sadness. As soon as I stopped taking it the moods went away. Since I have been on Vitex I have noticed the same thing, although not quite as bad as before. I am usually a really happy-go-lucky person so I think that my body just does not like too much progesterone. I will however endure anything to get my DD!!!