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Inositol

Inositol

Best for

Reduce excess androgens in PCOS

Likely strong benefit · 550–4000 mg/day for 7–26 weeks · 6 meta-analyses , n=31.3k

30 papers · 4 claims · 76 outcomes scored · 4 positive

Evidence summary

Evidence summary

Likely strong benefit

Inositol delivers a likely strong benefit for women with PCOS, most clearly for lowering excess androgens and improving ovulation and fertility hormones.

  • Across 7 studies (n=31,285), inositol improved excess androgens in PCOS and improved ovulation markers 2.
  • The broader evidence base spans 30 papers and 76 outcomes, with most signals concentrated in PCOS.
  • Most trials used myo-inositol or D-chiro-inositol daily for at least 8 weeks, limiting conclusions outside PCOS.

Outcomes

What inositol actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Reduce excess androgens in PCOS Likely strong benefit

Lowers the hormones that cause acne, unwanted hair, and missed periods in PCOS.

7 meta-analyses n=31k 550–4000 mg 7–26 wk #1/3
27493664·28544572·29042448·29178904 +3 more
Improve ovulation and fertility hormones Likely strong benefit

Strengthens the estrogen and progesterone signals that drive ovulation.

3 meta-analyses n=30k 550 mg 26 wk #2/10
27493664·41235304·41757236
Restore ovulation in PCOS Large effect, needs confirmation

Triggers the egg release that PCOS has been stalling.

4 meta-analyses n=729 600–4000 mg 7–10 wk #1/2
28544572·29178904·38163998·41757236
Improve insulin sensitivity Promising early signal

Your cells respond to insulin again so your pancreas works less hard.

11 meta-analyses n=31k 4–4000 g 8–26 wk
27493664·28544572·29042448·33553394 +7 more

Forms & standardisation

Myo-inositol has the deepest evidence stack, especially for PCOS. If you buy a combo, look for a label that names myo-inositol and D-chiro-inositol clearly, instead of hiding behind a vague blend. Fertility-focused studies also often pair inositol with folate, so a product that includes folate tracks more closely with the research setup.235

Risk profile

Adverse events and known drug interactions

Safety events

Grade 3 adverse events (various: dyspnea, dizziness, pain, arthralgia, cataracts reported in myo-inositol arm) severe
gastrointestinal side effects (nonspecific) mild
nausea mild
diarrhoea mild
flatulence mild
headache mild
bloating mild
fever mild

Drug interactions

Metformin moderate increases effect
other moderate decreases effect

Co-studied with

Supplements that share evidence with inositol

Vitaminb9 52 shared outcomes · d=0.57
Drug:Metformin 26 shared outcomes · d=0.36
Vitamind 11 shared outcomes · d=0.32
Riboflavin 11 shared outcomes · d=0.32
Vitaminb6 11 shared outcomes · d=0.32
Vitaminb12 11 shared outcomes · d=0.32
Zinc 11 shared outcomes · d=0.32
Lactobacillusrhamnosus 11 shared outcomes · d=0.32
Bifidobacteriumanimalis Species 11 shared outcomes · d=0.32
Fattyacids 11 shared outcomes · d=0.32
Iron 11 shared outcomes · d=0.32
Calcium 11 shared outcomes · d=0.32
Iodine 11 shared outcomes · d=0.32
Carotene 11 shared outcomes · d=0.32
Vitamin Unspecified 11 shared outcomes · d=0.32
Lactalbumin 8 shared outcomes · d=0.50

Frequently asked

Common questions

What type of inositol is best for PCOS?

Myo-inositol has the deepest trial stack for PCOS, and many fertility studies pair it with folate. Some research also uses a myo-inositol plus D-chiro-inositol combo, especially when the goal is hormone and ovulation support.235

How long does inositol take to work?

Most PCOS studies run for about 8 to 12 weeks before they report changes in ovulation, androgens, or insulin markers. Give it a full daily run, not a few random doses.234

Can you take inositol with metformin?

People do combine them in PCOS research, and that pairing shows up often enough to look useful. Still, the combo can push glucose effects harder, so you want clinician guidance instead of improvising the dose.14

Does inositol help with weight loss?

Weight loss is not its strongest lane. The better signal sits in insulin signaling, ovulation, and hormone balance, not on the scale.124

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Sources

  1. 1. Ovulatory and metabolic effects of D-chiro-inositol in the polycystic ovary syndrome (1999)
  2. 2. Inositols in polycystic ovary syndrome: a systematic review and meta-analysis
  3. 3. Myo-inositol treatment and ovulation in PCOS
  4. 4. Myo-inositol and insulin resistance in PCOS
  5. 5. Myo-inositol, folate, and fertility outcomes in PCOS

Generated May 15, 2026

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