Ovulation induction (OI) with controlled ovarian stimulation is a lighter form of treatment Ying might recommend for women who have normal tubes, and whose partners have a normal semen analysis, but who rarely or never ovulate.

For women who do ovulate regularly, stimulation can also be used to increase the chance of pregnancy by increasing the number of follicles that develop fully and, therefore, increasing the number of eggs that are ovulated during a cycle.

Several types of medications can be used to stimulate ovulation: either tablets of letrozole (Femara) or clomiphene citrate (Clomid or Serophene) and injections of follicle stimulating hormone or FSH (Gonal-F or Puregon).