Myo-inositol is the most abundant of the inositol isomers. Acts as a secondary messenger in insulin signaling.
Mechanism — Improves cellular insulin sensitivity, reduces hyperinsulinemia, and modulates ovarian androgen production. The 40:1 myo:D-chiro inositol ratio matches the physiologic distribution and produces the strongest PCOS outcomes.
Use case — PCOS, insulin resistance, anxiety (high-dose), and pregnancy preparation. Typical 2-4 g/day myo-inositol divided into two doses.
Caveats — Effects build over 8-12 weeks. Higher doses (12-18 g/day) used in anxiety and OCD research with caution. Pair with metformin or use as an alternative depending on tolerability.