Best for Hormones
Best D-Chiro-Inositol for Hormones
Top 6 products ranked · Reviewed May 2026 · 25–100 mg clinical dose
Why D-Chiro-Inositol for Hormones
D-Chiro-Inositol plays a supporting role in hormones. A minor inositol isomer involved in insulin signaling. Most commonly studied alongside Myo-Inositol for PCOS at a 40:1 ratio.
What dose to look for
Clinical studies typically use 25–100 mg of d-chiro-inositol. Typical D-Chiro-Inositol dose; often paired with Myo-Inositol in a 40:1 ratio (e.g. 2000 mg Myo : 50 mg DCI). Products below this range may not deliver meaningful results.
What the research says
D-Chiro-Inositol has moderate clinical evidence for hormones benefits. A few trials support its use alongside myo-inositol for PCOS at a 40:1 ratio Learn more
Clinical research on D-Chiro-Inositol
MODERATE — PCOS / insulin-androgen axis; weaker than myo-inositol, ratio-dependent · Best used in a 40:1 myo-inositol : D-chiro-inositol ratio; high-dose DCI alone is not advised
- •Early RCTs reported DCI lowered free testosterone and improved ovulation/insulin sensitivity in women with PCOS — the basis for its use as a PCOS androgen-lowering agent.
- •The 'DCI paradox': high DCI in follicular fluid is associated with WORSE oocyte quality, because ovarian granulosa cells need myo-inositol — so high-dose DCI alone can harm egg quality.
- •Comparative trials favor myo-inositol or a 40:1 myo:DCI blend over DCI alone for restoring ovulation; DCI's standalone PCOS evidence is thinner than myo-inositol's.