Inositol
Pronunciation: (ih-NO-sih-tol).
- Generic name
- Inositol
- Brand names
- Inoset, InoPure, Inotab, Inolife, Inosita, Inositol
- Drug class
- Nutritional supplement; Vitamin-like substance
Availability and supply rules vary by country
Trade names by country: United States
Australia: · Full directory
What Inositol is and how it works
Uses, formulations, monitoring, and supply rules can differ by patient, product, and country. Follow the exact local product information and professional advice.
Mechanism of action: how Inositol works
Inositol acts as a precursor for phosphatidylinositol, a key component of cell membranes, and is involved in intracellular signaling pathways. It modulates insulin signal transduction, influences neurotransmitter signaling (notably serotonin), and plays a role in oocyte maturation and metabolic regulation. (1)
What Inositol is used for
Polycystic Ovary Syndrome (PCOS)
Anxiety disorders (e.g., panic disorder, OCD)
Depression
Insulin resistance and metabolic syndrome
Used as an adjunct supplement to support metabolic health; a small pilot study in type 2 diabetes found reduced fasting glucose and HbA1c when added to existing glucose-lowering medication, though this is not a substitute for prescribed diabetes treatment and larger controlled trials are still needed to confirm the effect. (2) (3)
Before taking Inositol
Do not take / not appropriate for
- Contraindicated in patients with known hypersensitivity to inositol. (Contraindication) (2)
- Caution is also advised in diabetes due to potential effects on blood glucose. (Contraindication) (2)
Tell your clinician about
(2) (3)How to take Inositol
- General Instructions: Take inositol exactly as directed on the label or as prescribed by your healthcare provider. Do not exceed recommended doses.. Adult Dosing: Typical adult doses range from 500 mg to 4 grams daily, divided into 1-2 doses. For PCOS, doses up to 4 grams per day are commonly used.. Pediatric Dosing: Safety and dosing in children have not been well established. Use only under medical supervision.. Administration: Inositol can be taken with or without food. Powders should be dissolved in water or juice as directed.. When To Stop: Discontinue use if you experience severe side effects or allergic reactions, or as advised by your healthcare provider.. Storage: Store at room temperature, away from moisture and heat. Keep out of reach of children.
- This page does not provide a dose calculator. Dosing must follow the prescriber, pharmacist, or product label.
Procedures and treatment changes
Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (2) (3)
Missed dose
If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose. Do not double up to make up for a missed dose.
Overdose
Inositol overdose is rare but may cause severe gastrointestinal upset or electrolyte imbalance. Seek emergency medical attention if large amounts are ingested or if severe symptoms occur. (2) (3)
Side effects
Side effects and their urgency vary; report severe, persistent, or concerning symptoms to a healthcare professional.
Nausea
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Stomach cramps
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Diarrhea
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Gas
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Headache
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Dizziness
Incidence: Mainly reported at higher doses (around 12 g/day or more); typical supplement doses of 2-4 g/day cause few if any side effects (per PMC-indexed research)
Signs of mania (unusual elevated mood, racing thoughts, decreased need for sleep) in someone with bipolar disorder, or signs of an allergic reaction
Incidence: Uncommon but reported, especially at higher doses
Serious warnings
Not a substitute for prescribed medications — serious
Symptoms: Not a substitute for prescribed medications. May affect blood sugar levels; monitor closely if diabetic. Use caution in bipolar disorder—may worsen symptoms. Consult your doctor before use in pregnancy or breastfeeding. Keep out of reach of children.
Action: Follow the urgency stated and seek prompt or emergency care when indicated. (2) (3)
Contraindications recorded in the clinician database — serious
Symptoms: Contraindications recorded in the clinician database: Contraindicated in patients with known hypersensitivity to inositol. Use with caution in individuals with bipolar disorder, as high doses may exacerbate manic symptoms. Caution is also advised in diabetes due to potential effects on blood glucose.
Action: Follow the urgency stated and seek prompt or emergency care when indicated. (2) (3)
Interactions
| Medicine or test | Effect | Action |
|---|---|---|
| Recorded interactions | Inositol may interact with medications that affect serotonin (such as SSRIs), lithium, or insulin-sensitizing agents. Always consult your healthcare provider before combining inositol with other medications or supplements. | (1) |
Pregnancy, breastfeeding, kidney/liver function, age
Pregnancy
Myo-inositol has been studied and used in pregnancy, particularly for PCOS-related fertility support and in trials looking at gestational diabetes prevention; systematic reviews of these studies have not reported adverse effects, with mild gastrointestinal symptoms only seen at higher doses (around 12 g/day). This safety data is reassuring, but it does not mean inositol is proven effective for every claimed pregnancy benefit — a recent 2025 trial did not find it reduced pregnancy complications in PCOS. Discuss any use during pregnancy with your healthcare provider. (2) (3)
Breastfeeding
Data specific to use during breastfeeding are limited. Consult your healthcare provider before using inositol while breastfeeding. (2) (3)
Children
Frequency: Not recommended for pediatric use.. Weight Based: Not established; consult a healthcare provider for pediatric dosing.. Max Daily Dose: Not recommended for pediatric use.. Max Single Dose: Not recommended for pediatric use.. Age Restrictions: Safety not established in children. (2) (3)
Renal_impairment
Specific renal or hepatic impairment dosing data are not established for this supplement; discuss use with your healthcare provider if you have significant kidney or liver disease. (2) (3)
Hepatic_impairment
Specific renal or hepatic impairment dosing data are not established for this supplement; discuss use with your healthcare provider if you have significant kidney or liver disease. (2) (3)
Monitoring
(2) (3)Storage
Store at room temperature, away from moisture and heat. Keep out of reach of children.
Professional information
Clinician-facing context only. This section does not replace current product labeling.
General
Indication: Polycystic Ovary Syndrome (PCOS)
Dose summary: Typically 2-4 grams per day, divided into multiple doses.
Renal context: Specific renal-impairment dosing data are not established for this supplement; discuss use with a healthcare provider in significant kidney disease. (1) (2)
Frequently asked questions
What is inositol used for?
Inositol is used as a dietary supplement to support mental health (anxiety, depression), metabolic health (PCOS, insulin resistance), and reproductive health.
Is inositol safe to take daily?
Inositol is generally safe for most adults when taken at recommended doses. Always consult your healthcare provider before starting any supplement.
Can inositol help with PCOS?
Yes, inositol (especially myo-inositol) is commonly used to help manage symptoms of PCOS, including improving ovulation and metabolic parameters.
Are there any serious side effects?
Serious side effects are rare but may include allergic reactions, severe dizziness, or chest pain. Seek medical attention if these occur.
Can I take inositol with other medications?
Inositol may interact with certain medications, especially those affecting serotonin or blood sugar. Always discuss with your healthcare provider before combining supplements.
Is inositol safe during pregnancy?
Myo-inositol has been studied in pregnancy (for example, for PCOS-related fertility support and gestational diabetes prevention), and safety-focused reviews have not reported adverse effects, with only mild GI symptoms at higher doses. This does not necessarily mean it is proven effective for every claimed benefit — always consult your doctor before using inositol if you are pregnant or breastfeeding.
How long does it take for inositol to work?
Effects may be seen within a few weeks, but optimal benefits for conditions like PCOS or mood disorders may take 2-3 months of consistent use.
What happens if I take too much Inositol?
Taking excessive amounts of Inositol may lead to gastrointestinal upset, including nausea, gas, and diarrhea. While severe toxicity is rare due to its water-soluble nature, it is crucial to adhere to recommended dosages. If you suspect an overdose and experience concerning symptoms, discontinue use and seek emergency medical attention immediately for proper evaluation and guidance.
Can I drink alcohol while taking Inositol?
As a nutritional supplement, Inositol generally does not have direct contraindications with alcohol consumption. However, alcohol can deplete various B vitamins and impact overall metabolic health, potentially counteracting some of Inositol's benefits. It is always prudent to consume alcohol in moderation and discuss any concerns with your healthcare provider, especially if you are taking Inositol for specific health conditions.
What is the mechanism of action of Inositol?
Inositol acts as a precursor for phosphatidylinositol, a key component of cell membranes, and is involved in intracellular signaling pathways. It modulates insulin signal transduction, influences neurotransmitter signaling (notably serotonin), and plays a role in oocyte maturation and metabolic regulation. (1)
What is the generic name of Inositol?
The generic name is Inositol. It is sold under brand names including Inoset, InoPure, Inotab, Inolife, Inosita, Inositol.
What class of drug is Inositol?
Inositol is classed as: Nutritional supplement; Vitamin-like substance.
References
- MedGuideGlobal clinician-authored medicine record for inositolMedGuideGlobal · Internal · accessed 2026-08-06 · source 1
- Myo-inositol supplementation for prevention of gestational diabetes mellitus in overweight and obese pregnant women: a systematic review and meta-analysis (PMC9258131)NIH National Library of Medicine (PMC) · Peer-reviewed literature · accessed 2026-08-06 · source 2
- The Effectiveness of Myo-Inositol and D-Chiro Inositol Treatment in Type 2 Diabetes (PMC5078644)NIH National Library of Medicine (PMC) · Peer-reviewed literature · accessed 2026-08-06 · source 3
- HORMON BALANCE (MYO INOSITOL, D CHIRO INOSITOL, FOLATE, VITAMIN B12, VITAMIN D3, PROBIOTICS) CAPSULE [PHARMASUPPS LLP] — US prescribing information (DailyMed SPL)U.S. National Library of Medicine (DailyMed) · US · accessed 2026-08-14 · source 4
- Inositol — RxNorm normalized drug concept (RXCUI 5833)U.S. National Library of Medicine (RxNorm) · US · accessed 2026-08-14 · source 5
Brand names by country
Single-ingredient Inositol names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.
Priority countries
United States
- BulkSupplements.comBulkSupplements.com
- NOWNOW
- DCDC
- Wonder LaboratoriesWonder Laboratories
- AN Amazing Nutrition Amazing FormulasAN Amazing Nutrition Amazing Formulas
- Source NaturalsSource Naturals
- Nature's WayNature's Way
- Hard RhinoHard Rhino
- Country LifeCountry Life
- Vitamin WorldVitamin World