I used preseed before I figured out how to make my CM more fertile. It didn't work, but if you need a lube it's definitely worth the purchase since other lubes are not fertility friendly, and saliva is too acidic to help also. I take fertility blend. I absolutely love this product. It's a prenatal but it has all the other vitamins you hear about that aids in fertility (like vitex and folic acid). The first cycle I already had a dramatic increase in fertile cm, and my pms symptoms are damn near gone.