It starts with the egg
Bok
Whether you are trying to conceive naturally or through IVF, the quality of your eggs will have a powerful impact on how long it takes you to get pregnant and whether you face an increased risk of miscarriage. Poor egg quality is emerging as the single most important cause of age-related infertility, recurrent miscarriage, and failed IVF cycles.
The science of egg quality -- How to choose the right supplements -- The bigger picture.