When couples are trying to conceive it's best to take certain vitamins with key nutrients that increases fertility such as: Folic Acid - It has fertility benefits for both men and women. In men it increases the quality and amount of sperm. In women it increases the chance of pregnancy by promoting ovulation. Folic Acid is the most important vitamin supplement that should be taken by couples who are trying to conceive. Taking Folic Acid as a prenatal vitamin with the recommended 400mcg-600mcg before and 600mcg-800 mcg during pregnancy can help prevent birth defects. It should be taken daily along with healthy food.