Overview
Complementary inositol used in 40:1 myo-inositol ratio for PCOS.
- Endogenously produced or biosynthesized molecule
- Standardized pharmaceutical- or food-grade supplement
- Combined with cofactors that improve absorption or activity
- Capsule or softgel
- Powder
- Sublingual or buccal
- Liposomal liquid
Mechanism of action
Second messenger for insulin in androgen-producing tissues; lowers androgens.
- · Second messenger for insulin in androgen-producing tissues
- · lowers androgens
Effects on the body
Organ system effects
Evidence-based benefits
Lowers free T in PCOS women
Moderate evidencePotential side effects
- · D-Chiro-Inositol is generally well-tolerated at evidence-based doses
- · Mild GI discomfort (nausea, loose stools, or bloating) possible at higher intakes
- · Headache or transient fatigue reported by a small fraction of users
- · Allergic or hypersensitivity reaction (rash, itching, swelling)
- · Sleep disturbance if taken late in the day
- · Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing
Drug interactions
Safety & non-supplemental interactions
Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.
- ·Hypoglycemia tendency
- ·Insulin, metformin, sulfonylureas (additive hypoglycemia)
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified D-Chiro-Inositol — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.D-Chiro-Inositol third party tested NSF
CapsulesPre-measured D-Chiro-Inositol capsules — easiest for travel and consistent daily dosing without scoops or scales.D-Chiro-Inositol capsules
PowderBulk unflavored D-Chiro-Inositol powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.D-Chiro-Inositol powder unflavored
Best sellersMost-purchased D-Chiro-Inositol products on Amazon — a quick way to see what's reviewed widely before you commit.D-Chiro-Inositol best sellerScientific evidence8Show studiesHide studies
D-chiro-inositol in PCOS
Nestler JE, et al.
8-week RCT of DCI 1200 mg in PCOS.
Improved ovulation, insulin sensitivity, and androgens.
PubMed: D-Chiro-Inositol — Lowers free T in PCOS women
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Google Scholar: D-Chiro-Inositol — clinical evidence
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