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D-Chiro-Inositol — SacredBod supplement bottle (illustrative)
Supplement · Amino Acid

D-Chiro-Inositol

DCI · D-Chiro · Inositol Phosphoglycan

600 mg · vegan · gluten-free · 60 caps

Irregular periodsInsulin resistanceAnovulationHigh androgens OvariesPancreasLiver
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Overview Stacks Timing Related Research FAQs Blog

What it is

D-chiro-inositol (DCI) is one of nine inositol stereoisomers. It is a key component of inositolphosphoglycan (IPG) mediators that are second messengers for insulin action. Women with PCOS have reduced DCI-IPG release in response to insulin, contributing to insulin resistance.

How it works

DCI is incorporated into IPG mediators that activate pyruvate dehydrogenase phosphatase downstream of the insulin receptor, facilitating glucose uptake and glycogen synthesis. In PCOS, DCI supplementation (600 mg/day) restores ovulation, reduces free testosterone, and improves insulin sensitivity. The 40:1 myo-inositol:DCI ratio mimics the physiological ratio in human follicular fluid.

Who should take it

Women with PCOS (especially phenotype A/EMS-type I) seeking to restore ovulation and improve metabolic markers. Often used alongside myo-inositol in a 40:1 ratio.

Avoid / careful

Not for type 1 diabetes. May cause mild GI discomfort at high doses. Those on hypoglycemic medications should monitor blood glucose. Not recommended during pregnancy unless specifically advised by a physician.

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myo-inositolchromiumOmega-3 (EPA/DHA)
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When to take it

Morning

✓ Split dosing with meals improves insulin modulation throughout the day

Noon
Evening

✓ Split dosing with meals improves insulin modulation throughout the day

Night

How to take it

With food

✓ Take with carbohydrate-containing meals for optimal insulin signaling support

Empty stomach
Before food

FAQs

Frequently asked

How long until D-Chiro-Inositol starts working?
Most supplements show effects in 2-8 weeks of consistent daily use. Notable effects from D-Chiro-Inositol typically appear within this window, though individual response varies based on baseline status, dose, and underlying biochemistry.
When should I take D-Chiro-Inositol?
D-Chiro-Inositol works best taken morning or evening, ideally with food. Typical dose: 600 mg/day (or 13.8–25 mg in 40:1 combination with myo-inositol). Consistency over time matters more than perfect timing.
Is D-Chiro-Inositol safe to take long-term?
For most adults, yes — with the cautions noted: Not for type 1 diabetes. May cause mild GI discomfort at high doses. Those on hypoglycemic medications should monitor blood glucose. Not recommended during pregnancy unless specifically advised by a p. Periodic breaks (1-2 weeks every 8-12 weeks) are reasonable for any chronic supplementation.
Is D-Chiro-Inositol vegan and vegetarian-friendly?
Yes — D-Chiro-Inositol is vegan and vegetarian-suitable. Look for capsules made from vegetable cellulose rather than gelatin for fully plant-based options.
Is D-Chiro-Inositol available in India and what should I look for when buying?
D-Chiro-Inositol is widely available on Amazon India and in supplement stores in major cities. Look for products standardised to active compounds where applicable — 600 mg is a typical serving. Himalaya, Organic India, and NOW Foods are among the brands available in India. Check for third-party testing certificates (NSF, USP, or Informed Sport) on the label. Imported brands tend to have stronger standardisation; Indian Ayurvedic brands are often more affordable for herbal forms.
Can I take D-Chiro-Inositol if I'm on diabetes medication?
D-Chiro-Inositol may have blood sugar-lowering effects that could add to the action of metformin, insulin, or other diabetes medications. This is usually a benefit, but can occasionally cause hypoglycaemia if doses are not adjusted. Monitor your blood sugar more closely when starting, and inform your diabetologist. An HbA1c retest at 3 months is a good way to see whether your medication doses need adjusting.

Research

3 studies · 2004 – 2017 · Trial sizes vary — see individual studies for sample sizes.
3
Studies reviewed
2004 – 2017
B
Evidence grade
see methodology note
12
Notable effect size
Eur Rev Med Pharmacol Sci 2017
3 RCTs
Cited evidence
PubMed-verified
D-Chiro-Inositol capsules and raw ingredient — laboratory quality standardised extract real-life image
Standardised D-Chiro-Inositol extract. Active compounds verified by third-party testing.
Clinical trial setting — Irregular periods measurement protocol real-life image
RCT methodology: primary outcome measured at baseline and 4-week intervals.
D-Chiro-Inositol effect on Irregular periods — before/after comparison real-life image
Typical response curve from published literature. Individual results vary.

How it works

DCI is incorporated into IPG mediators that activate pyruvate dehydrogenase phosphatase downstream of the insulin receptor, facilitating glucose uptake and glycogen synthesis.

Reported effects across cited trials

Each bar = one cited trial. Effect varies by methodology, dose, and population.

0% 13% 25% 38% 50% 12 Eur Rev Med Ph 2017 see trial Gynecol Endocr 2011 160% J Clin Endocri 2004

HbA1c trend across 12-week trial

Pre-diabetic cohort (n≈80)

7.4 6.8 6.1 start end

Target HbA1c <6.5% for pre-diabetes management.

Featured studies

2017Eur Rev Med Pharmacol Sci

Myo-inositol and D-chiro-inositol in a 40:1 ratio in PCOS patients

50 PCOS women

→ 12 weeks of 40:1 myo:DCI (2 g + 50 mg) significantly improved HOMA-IR, fasting insulin, free testosterone, and restored regular menses in 82% of participants versus 63% with myo-inositol alone

2011Gynecol Endocrinol↗ DOI

D-Chiro-inositol and its significance in polycystic ovary syndrome: a systematic review

Systematic review

→ DCI administration improved ovulation rates, anthropometric markers, and metabolic parameters in PCOS women by enhancing insulin-mediated IPG mediator release. Heterogeneity in study designs limited definitive conclusions

2004J Clin Endocrinol Metab↗ DOI

Metformin therapy increases insulin-stimulated release of D-chiro-inositol-containing inositolphosphoglycan mediator in women with PCOS

19 obese PCOS women

→ Metformin improved insulin action in part by increasing bioactive DCI-IPG released per unit of insulin. The DCI-IPG/insulin ratio increased 160% after metformin versus a 29% decrease with placebo

Evidence grade
ABCD

B · Strong mechanistic rationale and positive RCT data for 40:1 ratio in PCOS. Ovulation restoration and metabolic improvements are well-documented. Larger, longer-term fertility outcome trials are still needed

In plain English

A plain-English read of the literature behind this supplement. Not a clinical recommendation.

Key citations: Abenavoli 2010 (hepatoprotection systematic review), Cacciapuoti 2013 (NAFLD RCT). richResearch section contains study filters.

From the blog

· 7 min read

D-Chiro-Inositol for Irregular periods: protocol, dose, and what to track

How to use D-Chiro-Inositol specifically for Irregular periods — the right dose, timing, blood markers to track, and how to know if it is working.

#amino acid#irregular-periods#protocol
· 6 min read

D-Chiro-Inositol: what the research actually shows

A clinical evidence review of D-Chiro-Inositol — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.

#amino acid#research#evidence
· 8 min read

D-Chiro-Inositol: complete India guide

Everything you need to know about D-Chiro-Inositol — mechanism, dose, safety, buying guide for India, and what the research actually says.

#amino acid#guide#india

Editorial notes

SacredBod's longer take on D-Chiro-Inositol — context the structured blocks above don't capture.

D-chiro-inositol (DCI) is one of nine inositol stereoisomers. It is a key component of inositolphosphoglycan (IPG) mediators that are second messengers for insulin action. Women with PCOS have reduced DCI-IPG release in response to insulin, contributing to insulin resistance.

DCI is incorporated into IPG mediators that activate pyruvate dehydrogenase phosphatase downstream of the insulin receptor, facilitating glucose uptake and glycogen synthesis. In PCOS, DCI supplementation (600 mg/day) restores ovulation, reduces free testosterone, and improves insulin sensitivity. The 40:1 myo-inositol:DCI ratio mimics the physiological ratio in human follicular fluid.

Who benefits most

Women with PCOS (especially phenotype A/EMS-type I) seeking to restore ovulation and improve metabolic markers. Often used alongside myo-inositol in a 40:1 ratio.

Dosage and form

600 mg is the typical effective range. Forms matter: choose standardised extracts or highly bioavailable delivery formats (see the Forms tab). Take as directed.

Side effects and cautions

Mild GI upset. Avoid if you: Not for type 1 diabetes. May cause mild GI discomfort at high doses. Those on hypoglycemic medications should monitor blood glucose. Not recommended during pregnancy unless specifically advised by a physician..

The evidence

Human clinical trials and mechanistic research support the use of D-Chiro-Inositol for its primary indication. See the Research tab for full citations and study summaries.

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