21XP
Helps regulate cycles and ovulation in women with PCOS, in small trials.
Inositol
Inositol is a natural compound found in fruits, beans, grains, and nuts
Often taken withBerberine, Vitamin D
Evidence-backed benefits
How Inositol can help, goal by goal, with the studies behind each score.
18XP
Small improvements in insulin sensitivity, mostly in women with PCOS.
Popular claims that did not hold up (1)
People often expect Inositol to help with these. The studies say otherwise, so they are not scored as benefits.
- Stress & Anxiety7XPEarly evidence of calming effects at high doses; very few trials.
How to read XP
Each score is for this supplement and that specific goal, not a general rating.
XP combines how reliable the research is with how much difference it usually makes. Higher means stronger evidence for that supplement and that goal.
Limited<15 XPModest15–27 XPModerate28–44 XPReliable45–69 XPHigh70+ XP
Dosage
What studies commonly use for Inositol, and how it is usually taken.
Usual dose
2,000–4,000 mg per day
2,000–4,000 mg/day (2–4 g/day)
How to take it
- With food
See study range
2,000–4,000 mg/day (PCOS/metabolic); up to 12–18 g/day (neuro-psychiatric trials)
Your journey
Fertility / PCOS comes first (week 8 → month 6); Blood Sugar Control takes longest (week 8 → month 6). An estimate from the studies' timelines, not a promise: everyone responds differently.
From the first noticeable effect to roughly full strength. Colour follows the XP tier of each benefit.
Make it a habit
These gains come from steady use, not a single dose. Keep Inositol in your routine for about month 6 before you judge it.
Safety
What to know before you take Inositol.
Safety rating
Well tolerated
Mild effects, if any.
No notable side effects at normal doses.
General information, not medical advice. If you are pregnant, take medication or have a health condition, check with a doctor or pharmacist first.
Common pairings
Supplements and habits often combined with Inositol.
Where to buy
Brands we looked at for Inositol, with our quality score for each.
Pure Encapsulations
Inositol Powder
Quality score4.6/5
Momentous
Inositol Capsules
Quality score4.5/5
Pure Encapsulations
Inositol Powder
Quality score4.6/5
Pure Encapsulations
Inositol Powder
Quality score4.6/5
No listings for this country yet.
Authority
Public figures who take or recommend Inositol. Portraits are AI-generated, not real photos, and this is not an endorsement.
Andrew Huberman
Neuroscientist
PractisesSourceBuild a stack around your goals.
Choose what you want to improve and see which supplements and protocols have the strongest research behind them.
Open the finder