Join Date: May 2005
Location: Northern California
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Yes, I have used B6 on two separate occasions. The first was in trying to conceive my son. At the time, I had barely 10 day luteal phases (which is the minimum you need). I can't remember how well it worked since it had been a long time since I had read info about B6 and I don't think I was taking a high enough dose. Obviously, I did conceive and carry to term my son, so something worked fine; whether or not it was the B6, I don't know.
And I am taking it now. My son is 2 and a quarter and still nurses a lot. I had to deliberately night wean him to get my cycle to return (because we wanted to ttc). So I finally got my period back at 25 months postpartum and in my first cycle, I ovulated on day 22 (!) and then started taking 200 mg of B6. I had an 8 day luteal phase. The next cycle (the one I am on now), I ovulated on day 16 and am currently on day 12 of my luteal phase; I have been taking B6 the throughout the cycle.
According to Taking Charge of Your Fertility by Toni Wechsler (which I would highly recommend reading if you haven't already done so), you need at least a 10 day luteal phase in order for a fertilized egg to have enough time to implant. If you've got a 12 day luteal phase, I wouldn't worry; that seems plenty long. Toni also says that research shows that between 200 and 600 mg of B6 can lengthen one's luteal phase.
There's also something called Vitex (or Chaste tree berry) that is said to do the same, but I don't know how/where you get it or what sorts of side effects it has. And Natural progestrene cream can also lengthen your LP, and again, I know nothing more about it.