What it does in the body
- Phosphatidylinositol (PI) signaling — IP3/DAG second messenger cascade
- Insulin signal transduction (mediates insulin's intracellular effects)
- Cell membrane structural integrity (phosphatidylinositol)
- Neurotransmitter receptor sensitivity (serotonin, dopamine)
- Oocyte maturation and ovarian function
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | No established DRI; typical dietary intake ~1g/day; therapeutic doses 2-18g/day | Various clinical trials |
| Adult female | No established DRI; PCOS: 4g myo-inositol/day | ESHRE/International PCOS Guidelines |
| Pregnancy | 4g myo-inositol/day being studied for gestational diabetes prevention | Clinical trials |
| Children | No established requirement | N/A |
| Older adults | No established requirement | N/A |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Cantaloupe | 355 mg per 100g | global |
| Oranges/citrus fruits | 307 mg per 100g | global |
| Lima beans (cooked) | 245 mg per 100g | Americas |
| Brown rice | 300 mg per 100g (mostly as phytic acid/IP6) | Asia |
| Grapefruit | 199 mg per 100g | global |
| Green beans | 193 mg per 100g | global |
| Whole wheat bread | 288 mg per 100g | global |
| Peanuts | 134 mg per 100g | Americas/Africa |
If you don't get enough
Mild: Subtle insulin resistance, mild mood changes
Moderate: Increased insulin resistance, impaired ovarian function, anxiety symptoms
Severe: Not typically seen as a classical deficiency since the body synthesizes it; however, functional insufficiency contributes to PCOS, metabolic syndrome, and diabetic complications
Time to onset: Functional insufficiency is chronic and related to metabolic conditions rather than acute dietary depletion
Too much
Upper limit: No established UL; doses up to 18g/day used in clinical trials
GI distress (nausea, flatulence, diarrhea) at doses >12g/day. No serious adverse effects documented.
How well you absorb it
Well absorbed from the GI tract; crosses the blood-brain barrier via a sodium-dependent transporter
Helped by: Normal renal function (kidneys are a major site of endogenous synthesis), Adequate glucose supply (substrate for synthesis)
Hindered by: Lithium (blocks inositol monophosphatase, reducing intracellular inositol recycling — may explain therapeutic mechanism in bipolar disorder), Valproic acid (depletes brain inositol), Chronic hyperglycemia (aldose reductase pathway diverts glucose away from inositol synthesis)
Cooking & storage
Free inositol is water-soluble and heat-stable. Phytic acid (inositol hexaphosphate, IP6) in grains and legumes is partially converted to free inositol by soaking, sprouting, and fermentation.
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