Getting pregnant fast.
I wrote a post recently about fertility help, but I feel like it merits saying again. Fertilitea (Chasteberry/Vitex as the main ingredient), soy isoflavones, and Evening Primrose Oil. Worked in just one cycle for me after 3.5 years of trying! There are loads of posts online with similar success stories at varying dosages.
This applies significantly to women who have very long and/or erratic cycles.
For hubby, selenium for better little swimmers and a testosterone boost.
Good luck to all you TTC'ers!