What Is D-Chiro-Inositol?

D-chiro-inositol (DCI) is a stereoisomer of inositol that the body converts from myo-inositol through an epimerase enzyme. It is best known as the minor partner of the 40:1 blend: DCI-containing phosphoglycans act as secondary messengers in cell signalling, and tissues with altered inositol metabolism often show a skewed myo-to-DCI ratio. That mechanism made DCI a staple of inositol and metabolic-health research, usually combined with myo-inositol at the 40:1 ratio found in healthy tissues. Core Nutrix supplies it at 98% purity as a white fine powder.

Key Facts at a Glance

• Purity: 98% (HPLC)
• CAS number: 643-12-9
• Appearance: White fine powder
• Typical serving: 500-600 mg per day or 40:1 with myo-inositol
• Solubility: Freely soluble in water
• Common ratio: 40:1 myo-inositol to D-chiro-inositol
• Packaging: 25 kg drum (custom formats available)
• Shelf life: 24 months in sealed, cool, dry storage

Origin & Sourcing

Produced through a controlled conversion and purification route from the inositol platform, followed by crystallization to 98% purity with HPLC verification. Because DCI is a rare and expensive isomer, purity control is the critical quality parameter – low-grade material can carry unwanted isomers or process residues. Every batch ships with COA, MSDS and GMO-free documentation, and the powder is available as a pre-blended 40:1 myo/DCI mix for one-stop women’s wellness formulas.

Key Benefits

• Occurs naturally in cell-membrane signalling pathways
• Studied for inositol and metabolic-health research
• Standard partner to myo-inositol at 40:1
• 98% purity for premium women’s health formulas
• Freely water-soluble for powders and beverages
• Pre-blended 40:1 myo/DCI mix available

Applications

Women’s-health capsules, women’s wellness formulas, metabolic-wellness drink mixes, gummies and stick packs. The 40:1 myo-inositol to DCI blend is the most widely used format in published human studies, and most finished products use DCI as the precision component inside that ratio. Beyond capsules, DCI appears in gummies and drink sticks within 40:1 blends, and women’s-health lines pair it with folic acid and coenzyme Q10. The pre-blended 40:1 mix simplifies production for brands that want a single-dispensing ingredient with the clinical ratio locked in at the blending step.

Why 2026 Matters

Women’s health and women’s wellness awareness continue to grow, and the 40:1 myo/DCI ratio is the format used in most published inositol research. DCI is the scarce, high-value half of that pairing: a 98% pure, HPLC-verified supply with a pre-blended option removes the formulation risk for brands launching women’s wellness lines, and supports the premium purity claims the market rewards. The category has also professionalized: women’s wellness protocols are now discussed in mainstream medical media, and consumers check the myo/DCI ratio on the label. That rewards suppliers offering verified 98% purity and pre-blended 40:1 mixes, because ratio errors at the blending step are a frequent quality failure in this category. For OEM customers, DCI is the premium anchor that justifies a women’s-health line’s price point.

Science Snapshot

D-chiro-inositol phosphoglycans (DCI-IPGs) are proposed mediators in cell signalling, and reduced DCI availability in some tissues is part of the leading hypothesis. Published clinical trials of DCI – typically 500-600 mg per day, often with myo-inositol at 40:1 – report changes in metabolic and hormonal markers. Notably, research suggests the ratio matters: high-dose DCI alone has shown less favorable outcomes in some studies than the 40:1 combination. The epimerase relationship explains the 40:1 protocol: healthy tissues maintain a specific myo-to-DCI ratio, and that ratio can shift under metabolic stress. Published trials combining 2-4 g myo-inositol with 550 mg DCI report changes in ovarian and metabolic markers in women’s wellness populations, and several head-to-head designs report better results for the combination than for either isomer alone. Selected reviews: Dinicola S, et al. Int J Mol Sci 2021 (PMID 34638926); Laganà AS, et al. Expert Opin Drug Metab Toxicol 2022 (PMID 35472446); full reference list on request. Purity matters for dosing accuracy: stereoisomer contamination changes the effective dose of the active isomer.

Quality & Specifications

• Purity: 98% (HPLC)
• Appearance: White fine powder
• Solubility: Freely soluble in water
• Packaging: 25 kg drums (custom formats available)
• Shelf life: 24 months in sealed, cool, dry storage
• Testing: HPLC purity, heavy metals, microbiology, ethylene oxide (EtO), aflatoxins, PAH, pyrrolizidine alkaloids (PAs)
• Compliance: Pesticide residue screened to EU MRLs (EC) 396/2005; Proposition 65 (Prop 65) statement and full contaminant documentation on request
• Note: Business-to-business ingredient information only. Not intended to diagnose, treat, cure or prevent any disease.

Safety & Regulatory

Used at 500-600 mg per day in published protocols. Pregnancy-related and metabolic protocols should be supervised by a healthcare professional, and insulin medication users need monitoring.

Formulation Notes

DCI doses are small, so content uniformity and weighing accuracy matter – it is typically pre-blended with myo-inositol at 40:1 for capsule filling. The powder is freely soluble and works in gummies and drink sticks. For capsules, 600 mg of DCI plus 2.4 g of myo-inositol becomes a four-capsule daily dose, which is why gummies and powders are popular alternatives. Pairs with folic acid and chromium in metabolic stacks.

How It Compares

• DCI vs myo-inositol: myo-inositol is the bulk isomer making up about 99% of the body’s inositol pool; DCI is the rarer signalling isomer. Women’s wellness formulas combine them at 40:1.
• 40:1 blend vs DCI alone: clinical evidence favors the 40:1 ratio; high-dose DCI monotherapy has shown less favorable outcomes in some trials.
• 98% vs 95% DCI: purity directly affects dose accuracy and premium claims for a high-cost active ingredient.
• DCI vs berberine: both support metabolic positioning through different mechanisms – DCI via inositol signaling, berberine via AMPK – and are often combined.

Frequently Asked Questions (FAQ)

What purity do you supply?

98% minimum D-chiro-inositol, verified by HPLC.

Can you provide a COA and third-party test report?

Yes. Every batch ships with a Certificate of Analysis, and third-party testing is available on request.

What is the MOQ and packaging?

Standard packaging is a 25kg drum. Please contact us for current MOQ and sample availability.

What is the 40:1 ratio?

The myo-inositol to D-chiro-inositol ratio found in healthy tissues and used in most women’s wellness clinical protocols.

Can I order a myo/DCI premix?

Yes. We supply pre-blended 40:1 myo-inositol to DCI mixes to simplify capsule and powder production.

What is the typical daily serving?

Clinical studies commonly use 500-600 mg of DCI per day, usually within a 40:1 myo/DCI combination.

Is it plant-derived or synthetic?

It is produced through a controlled conversion and purification process and supplied as a pure crystalline powder.

How to Get Started

1. Tell us your format and target dose – capsules, powders, tablets, gummies or beverages.
2. We confirm the matching grade, send the specification sheet and a free sample.
3. Approve the sample and run a trial batch; we lock the COA and lead time.
4. Scale to full production with batch-to-batch consistency guaranteed.