There are nine forms of inositol, which has the ability to improve metabolic and reproductive aspects. But the two that have the biggest impact on PCOS are myo-inositol (MI) and D-chiro-inositol (DCI). Normally, MI is converted to DCI. Myo-Ins, alone or in combination with D-chiro, can help restore ovulation and improve fertility in PCOS women is the best inositol.