I took agnus castus which I think is vitex when I conceived baby#4 but I just wasn't ovulating and my cycles were 90+ days for 18 months and didn't ovulate once, got the horrendously long charts to show for it. Unfortunately they've stopped selling the brand I used and I'm convinced its what worked for me. I took 400mg for 30 days of one then changed to lindens brand 1000mg. I took 2 every morning, so 2000mg and ovulated 19 days later, bfp 9 days after that. Not sure how it works if your cycles are regular tho as I did read when I was looking up on it that it messed some women's cycles up who were normally regular. I had nothing to lose at the time so went for it and I fell within a month. Maybe have a Google and try find some more info for yourself before giving it a try. I took tablets but I think you can by the liquid and if I remember that supposedly works quicker.