Just wanted to add another anecdote to this thread as I found it 11-12 weeks ago and decided to try B6.
I had been having painful ovulation (bad cramping for a day or so before--so bad I actually burned myself with a hot water bottle and didn't know about it until I saw the blister) at 14-15 days with a 10-11 day luteal phase. I started taking 1 full pill of a B complex with 50mg on about day 2-3 of my cycle. The B6 made the painful ovulation go away the first month and lengthened my ovulatory phase to 18 days. After I ovulated I dropped down to half a pill per day (and am still taking that amount). No idea on how it effected the luteal phase as it worked the first month for me though I thought I was starting to spot at 12dpo (which would have been a 1 day improvement).
I had been having painful ovulation (bad cramping for a day or so before--so bad I actually burned myself with a hot water bottle and didn't know about it until I saw the blister) at 14-15 days with a 10-11 day luteal phase. I started taking 1 full pill of a B complex with 50mg on about day 2-3 of my cycle. The B6 made the painful ovulation go away the first month and lengthened my ovulatory phase to 18 days. After I ovulated I dropped down to half a pill per day (and am still taking that amount). No idea on how it effected the luteal phase as it worked the first month for me though I thought I was starting to spot at 12dpo (which would have been a 1 day improvement).