By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated July 27, 2026

D-Chiro-Inositol (DCI) is a second messenger in insulin signaling that promotes cellular glucose uptake. At the ovarian level, DCI mediates insulin's stimulation of theca-cell androgen production and suppresses granulosa-cell aromatase activity. In PCOS/PMOS, a separate defect reduces the conversion of myo-inositol to DCI in muscle, liver, and fat tissue. Restoring DCI in these insulin-target tissues improves insulin sensitivity and lowers circulating insulin, which reduces the insulin-driven ovarian androgen output responsible for hyperandrogenism.

DCI supplementation improves insulin sensitivity, lowers circulating androgen levels, and can restore ovulatory function in women with PCOS. High doses of DCI taken alone can still harm oocyte quality: the same ovarian signaling that drives theca-cell androgen production responds to DCI directly. The preferred clinical approach combines myo-inositol and DCI at a ratio approximating the physiological plasma proportion, rather than using DCI in isolation.

RRM clinicians may consider ratio-based inositol supplementation as a nutritional support option for women with PCOS, adjusted under clinical supervision.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.